Abstract
Energy harvesting from human motion is suitable for powering battery-less wearable devices. In such applications, electret energy harvesters (EH) have advantages over other type of EHs due to the fact that low-frequency motion is dominant. In this talk, development of new electret materials based on quantum chemical analysis and machine learning are presented, and their application to rotational/stretchable electret EH are introduced. In the last 90 years since the first development of electret using Carnauba wax, electret materials have been developed by heuristic approach. In the present study, for the first time, a novel high-performance amorphous fluorinated polymer electret based on quantum chemical analysis and machine learning is proposed. A new electret material based on CYTOP thus obtained offers a record-high surface charge density with extremely-high thermal stability of implanted charges. In addition, novel stretchable electret material based on amorphous fluorinated polymer is also discussed. As an application of the developed CYTOP electret, a novel low-profile rotational electret EH is prototyped. Output power up to 1 mW has been obtained at a low rotational speed of 1 rps with only 3 mm in thickness. Evaluation of the rotational EH for human walking is also discussed.

Biography
Yuji Suzuki received the B.S., M.S., and Dr.Eng. degrees in mechanical engineering from the University of Tokyo, Tokyo, Japan, in 1987, 1989, and 1993, respectively. He is currently with the Department of Mechanical Engineering, the University of Tokyo, as a Professor. He received IEEE Fellow, Fellow of Combustion Institute, and Fellow of JSME. He serves as Steering Committee Member of PowerMEMS Conference, Organizing Committee member of IEEE International Symposium on Electret (ISE). He also served as the general co-chair of IEEE MEMS2010 (Hong Kong) and the general chair of PowerMEMS 2017 (Kanazawa). His research interests include MEMS-based energy harvesting using electrets, micro energy conversion such as microscale combustion, and optimal design/control of micro heat and fluid flow.

Abstract
Robotic hand-based chemical sensors have shown a promising outlook by minimizing the exposure of humans to hazardous chemical pollutants, however their implementation in real environments is limited due to external high-power requirement, poor selectivity and the complexities related to integrating the sensors directly on the robotic hand. Recent progress in triboelectric nanosensors and nanogenerators presents tremendous opportunities to address these issues. Here, we report an innovative self-powered triboelectric nanosensor integrated with a robotic hand with additional wireless transmission functionality to detect Hg2+ ions, a harmful chemical pollutant, in a rapid single-step onsite detection mechanism. in resource-limited settings. The robotic hand was mounted with Tellurium nanowire (Te NW) arrays that served as a solid triboelectric material, which underwent periodic contact and separation with the Hg2+ solution, leading to the in-situ formation of HgTe NWs owing to the selective binding affinity of Te NWs toward Hg2+ ions. Such realization of direct integration of self-powered sensors with robotics could pave the way for low-cost, automated chemical sensing machinery for the on-field detection of harmful analytes, potentially suitable for various environmental and security applications.

Biography
Dr. Zong-Hong Lin received his PhD degree in Chemistry from the National Taiwan University in 2009 and continued with his postdoctoral research at the National Taiwan University and the Georgia Institute of Technology during the years of 2010-2014. Subsequently, Dr. Lin joined the Institute of Biomedical Engineering, National Tsing Hua University (NTHU) as Assistant Professor in August 2014 and was successfully promoted to Associate Professor and Full Professor with Tenure effective from August 2017 and August 2021, respectively. In recognition of his academic achievements, Dr. Lin was invited as Adjunct Faculty for both the Department of Power Mechanical Engineering, Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters at NTHU. In 2023, he moved to Department of Biomedical Engineering, National Taiwan University. Dr. Lin’s research interests include the development of self-powered (bio)chemical sensors, biomedical diagnostic devices, wearable healthcare electronics and remote intelligent monitoring platform, micro- and nano-electrodes/materials for electrical stimulation applications. He has published more than 110 SCI papers (sum of the times cited: 12514, h-index: 55), as well as received awards for his acclaimed research contributions, such as Fellow of the Royal Society of Chemistry (2022), Future Tech Award of the Taiwan National Science and Technology Council (NSTC) (2021 and 2022), Ta-You Wu Memorial Award of the Taiwan NSTC (2021), Young Scholar Fellowship of the Taiwan NSTC (2020), IEEE-NANOMED New Innovator Award (2019) and Young Investigator Award of the National Tsing Hua University (2018).

Abstract
A fully interconnected and intelligent living environment has been a grand challenge for future smart society and it is critically essential to develop the interactive sensing and actuating systems to bridge the human-machine interfaces. Here, flexible electromechanical transducers based on high-performance piezoelectret or piezoelectric polymers are fabricated to selectively perform either the actuating or sensing function. As self-powered sensors, both low pressure detection limit for sensing resolution and excellent stability have been achieved, with typical application in monitoring human physiological signals. As actuators, mechanical vibrations with large output force have been produced for providing haptics feedback to human skin. Such actuators are also used to construct soft robotics with high agility and controllability to explore surroundings, like detecting gas leakage. The design principle together with the sensing and driving characteristics can be further developed and extended to other soft matters and flexible devices.

Biography
Dr. Junwen Zhong joined Department of Electromechanical Engineering, University of Macau since 2020/11. His research interests include self-powered systems, flexible sensors, electromechanical actuators, and soft robots. He got his B.S. Degree in 2011 and Ph.D Degree in 2016 from Huazhong University of Science and Technology China. He was a postdoctoral researcher in University of California Berkeley USA, from 2016-2019, and a special postdoctoral researcher in RIKEN Japan, in 2020. Dr. Junwen Zhong has published over 75 papers, among which over 40 papers are published as the first author or corresponding author in top journals with IF>10. Some of his papers are published in top journals like Science Robotics, Nature Communications, Energy & Environmental Science, Advanced Materials, Advanced Functional Materials, ACS Nano, Nano Energy, and Biosensors and Bioelectronics. He has over 5800 citations with H-index of 31. His researching works are reported by Science, Nature Nanotechnology, Scientific American, Nature Electronics, Chemical & Engineering News, Electronics Europe News, New Scientist, Berkeley News as highlights.

Abstract
In the era of the internet of things, wearable electronic technology can help citizens to avail advanced features and characteristics in different facets of their daily life. These wearable electronics are powered by current energy storage devices that need regular recharging, but the increasing demand for continuous operation is driving research into new power supplies that can deliver stable electricity. One major development has been a conceptual shift away from grid supply charging toward self-powering, in which the devices continuously operate without external power feeding. Triboelectric nanogenerators (TENGs) are emerging as a power supply for self-powered electronics due to their light weight, simple fabrication, diversity in material selection, and high energy conversion efficiency, but the power output of TENGs needs to be trimmed to stably power the electronics. There is a need for flexible power management for self-powered electronic applications, particularly for wearable devices. In this talk, I will address several strategies for power management of TENGs to achieve the high performing self-powered electronics, including voltage trimming, humidity insensitivety, and durablility control.

Biography
Dong-Myeong Shin is currently Assistant Professor of Mechanical Engineering at the University of Hong Kong (HKU). He was inspired to work in nanoscience as an undergraduate researcher with Prof. Yoon-Hwae Hwang and Prof. Hyung Kook Kim at Pusan National University (BS, 2009), where his work focused on the bioprotection effect of sugar glass on living cell. He obtained his M.S (2011) and Ph.D. (2016) degrees in nanomaterials at PNU, continuously working with his two mentors. At PNU, Dong-Myeong's research focused on the glassy dynamics of sugar in nanoconfinement, capacitive biosensor, piezoelectric and triboelectric nanogenerators. In 2016, he joined the Research Center for Energy Convergence Technology (RCECT) at PNU, where his research centered on the bioinspired sensor, to work with Prof. Kyujung Kim as a postdoctoral researcher. Following his Ph.D. and Postdoctoral research at PNU, in 2017, he moved to the University of California, Berkeley as a postdoctoral scholar with Prof. Jeffrey R. Long. His research is dedicated to developing the single ion conducting network polymer for battery applications. Upon completion of his postdoctoral studies in the summer of 2019, Dong-Myeong traveled back to Asia to assume his current position of Assistant Professor of Mechanical Engineering at HKU, where his group has devoted to developing the self-powered nanoelectronics, with an emphasis on important components such as energy harvesting/storage devices and bioinspired electronics.

Abstract
Recently, intelligent electronics has been developing, creating a new strategy for flexible electronics which are widely used in everyday human activities. Generally, every electronic gadget needs a power source, and triboelectric nanogenerators (TENGs) could be a potential power-supplying candidate. TENGs are a renewable energy source used to harvest mechanical energy from everyday human life and convert it into electricity. However, the TENG conversion efficiency mainly relies on the properties of the triboelectric material, device structure, and a proper method to integrate with electronics. The power generated by the TENG can directly be used for a sensor system or combined with a power management circuit for energy storage.

Biography
Jae Su Yu received his Ph.D. degree in optoelectronic engineering from the Department of Information and Communications, Gwangju Institute of Science and Technology, Republic of Korea, in 2002. Afterwards, he worked in Center for Quantum Devices, Northwestern University, Evanston, IL, as a Postdoctoral Fellow (2002). Since 2006, he is a Tenured Professor in the Department of Electronic Engineering, Director of the Institute for Wearable Convergence Electronics, Kyung Hee University, Republic of Korea. He joined John A. Roger's research group in University of Illinois at Urbana-Champaign, IL, as a visiting scholar in 2012-2013. He has authored or co-authored more than 550 SCI(E) indexed journal papers. His recent research interests include nanogenerators, supercapacitors, solar cells, optical sensors, nanophotonics, and phosphors.

Abstract
Exploring the possibilities of renewable, sustainable, and green energy sources to replace fossil fuels is one of the most significant and challenging issues in energy research because of air/water pollution and oil depletion due to the use of fossil fuels. Researchers have developed energy generator with piezoelectric and triboelectric properties as a renewable energy source that can convert mechanical energy into electricity. In addition, considering the low power consumption features of various portable devices, wearable devices, numerous sensors for internet of things (IoT), and body implantable devices, the concept of power generation through energy generation from environmental sources has gained great attention. As well-known, the energy generating device based on triboelectric effect have the advantages of high output, simple design, low cost, flexibility, thin device packages, and light weight. To date, the design and development of device structures, materials and systems has been intensively investigated for improving their output performance. Our major goal is designing and development of energy generation materials and device for the realization of self-powered electronics. In this presentation, I will introduce recent investigation of triboelectric materials and their applications.

Biography
Ju-Hyuck Lee is an Associate Professor at Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST). Dr. Lee received his B.S. degree in Advanced materials science and engineering from Sungkyunkwan University (SKKU) in 2011, and received his Ph.D. in Nanoscience and Engineering from SKKU in 2016. From 2016 to 2018 he joined in the department of bioengineering at University of California, Berkeley, as a postdoctoral scholar. Since 2018, he joined the Department of Energy Science and Engineering, DGIST, as an Assistant Professor. Dr. Lee’s recent research interest is the design and development of functional materials for piezoelectric/triboelectric nanogenerators, and self-powered sensors.

Abstract
Triboelectric nanogenerators (TENGs) are emerging as a promising technology for harvesting mechanical energy from daily human movements and converting it into electrical energy for self-powered biomedical applications. TENGs have been utilized in a range of self-powered biomedical diagnostic and therapeutic applications, such as biosensing, drug delivery, tissue repair, and self-powered cardiac pacing.Wearable TENGs are integrated into clothing or accessories, while bioimplantable TENGs are implanted into the human body to harvest energy from natural body movements, such as the beating of the heart or the movement of organs, and generate electrical power for various biomedical applications. TENGs encounter several challenges that need addressing to improve their efficacy for self-powered biomedical applications. These challenges include the biocompatibility of materials used in bioimplantable TENGs, the stability of TENG performance in the human body, and the optimization of TENG design for maximum power output. Overall, TENGs hold significant promise for the development of self-powered, autonomous biomedical devices that can enhance patient outcomes and quality of life. The unique advantages of TENG, including its simplicity, flexibility, long service life, and biocompatibility, render it an ideal technology for the future of self-powered biomedical applications.

Biography
Dr. Daewon Kim is an Associate Professor in the Department of Electronic Engineering at Kyung Hee University, Korea. He received his B.S. and Ph.D. degrees in Electrical Engineering from the Korea Advanced Institute of Science and Technology (KAIST) in Daejeon, Korea, in 2009 and 2016, respectively. He worked as a postdoctoral researcher in Electrical and Systems Engineering at the University of Pennsylvania, Philadelphia, USA. Since 2017, he joined the Department of Electronic Engineering at Kyung Hee University as an Assistant Professor. His current research interests include energy harvesting/storage devices, power management circuit design, bio-compatible and sustainable micro- and nano-electronic devices.

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Silicon microcantilevers as one of the most fundamental forms of MEMS devices have found extensive applications in various fields during the last three decades. Simple operating mechanism, high throughput fabrication, rapid signal transduction with high precision are among the most significant merits of silicon microcantilever sensors. However, new materials have been explored and adopted to impart new functionality/capability to microcantilever sensors over the last two decades. Among new materials, anodic aluminum oxide (AAO) shows interesting features with its nano-porous structure. We have designed and fabricated nano-porous AAO microcantilevers for nanomechanical infrared (IR) spectroscopy as well as standoff IR spectroscopy. Recently, we transformed the nano-porous structure of AAO microcantilevers into the nano-channels to investigate fluid-structure interaction in micro/nanoscale. Nano-channelled AAO cantilevers with different pore sizes are successfully fabricated. Resonance frequencies, Q-factors, and phase-portraits as a function of flow rate and gas type are systematically investigated to elucidate micro/nanoscale fluid-structure interaction phenomena.

Biography
Dr. Kim is an Associate Professor and Canada Research Chair in Nano Sensing Systems, in the Department of Mechanical and Manufacturing Engineering at the University of Calgary. He received his B.Sc. (1998) and M.Sc. (2000) degrees in Aerospace Engineering from Seoul National University, Seoul, South Korea and Ph.D. (2008) in Mechanical, Aerospace and Biomedical Engineering from the University of Tennessee, Knoxville, USA. He was a Postdoctoral Research Associate at Oak Ridge National Laboratory, USA and an Acting Research Associate at the University of Alberta, Canada prior to his current position. Dr. Kim has founded the Nano/Micro-Sensors and Sensing Systems Laboratory (NMSSS, https://www.ucalgary.ca/labs/nanosensors/home) at the University of Calgary in 2013 to develop 1) ultrasensitive chemical/biological sensors and sensing systems based on micro/nanotechnology; 2) novel micro/nano-metrologies to characterize nanomaterials and polymeric nanocomposites for energy and environmental applications. His current research topics are i) Integration of current M/NEMS with IR spectroscopy to create highly sensitive and selective sensors and materials characterization platforms; ii) Development of novel nano-metrologies based on scanning probe microscopy (SPM) that enables the multi-physical and chemical material property characterization for energy, environment, and biomedical applications; iii) Novel synthesis of metal organic frameworks (MOFs) and functionalized MOFs nanocomposites for various chemical/biological sensing applications; iv) Theoretical, numerical, and experimental study of multi-scale fluid-structure interaction phenomena for physical/chemical/biological sensing applications; v) Additive manufacturing of polymer-derived ceramics; vi) Quantum materials for new sensing devices. E-mail: sskim@ucalgary.ca

Abstract
In my lab, we study acoustic waves in the biological system. Our body generates many kinds of acoustic waves from the heart, blood flow, bladder, brain, cells, etc. These acoustic waves carried important physiological information. On the contrary, acoustic waves can be introduced to the body to reach the deeper region for imaging, alternating, or powering. In this talk, I will focus on both aspects of acoustic waves in the body: sensing blood wave-generated acoustic waves and introducing ultrasonic waves to the body for powering implantable bioelectronics. Particularly, I will elaborate on some of our recent work on 1) Smart Stent for detecting blood flow in an abdominal aneurysm and 2) 3D printable barium titanate nanoparticles as a power source for implantable bioelectronics.

Biography
Albert Kim is currently an Assistant Professor of Medical Engineering at the University of South Florida. He earned a B.S., M.S., and Ph.D. in Electrical and Computer Engineering from Purdue University in 2008, 2011, and 2015. From 2015 to 2017, he joined Intel Corp. as an R&D engineer. Prior to his current position, he was an Assistant Professor of the Electrical and Computer Engineering department at Temple University (2017-2022). His research interests are in transformative engineering toward medical applications, including Nano/Micro Electromechanical Systems (N/MEMS), microsystems, mobile health (mHealth), and biomimetic sensors and actuators. As a faculty member, Dr. A. Kim received the most prestigious award, NSF CAREER Award, in 2022. He is also a full member of Sigma Xi.

Abstract
Photonic integrated circuits (PICs) promise to be the optical equivalent of electronic integrated circuits (ICs). However, current PICs fall far short of electronic ICs in the number of devices per chip. One roadblock is the power consumption and the footprint of active photonic components. By micromechanical actuation of PICs, we show orders of magnitude reduction of power consumption compared to current thermo-optic counterparts. We demonstrate our approach by implementing MEMS tunable photonic devices such as phase shifters, couplers, and wavelength filters. We realize our technology in a silicon photonics foundry platform and show complex circuits on a small chip. Furthermore, we show wafer-level vacuum-sealing of the silicon photonic MEMS circuits.

Biography
Kristinn B. Gylfason {1}, Pierre Edinger{1}, Gaehun Jo{1}, Chris Phong Van Nguyen{1}, Alain Yuji Takabayashi {2}, Carlos Errando-Herranz {1}, Cleitus Antony, Giuseppe Talli {3}, Peter Verheyen {4}, Umar Khan {4, 5}, Simon J. Bleiker {1}, Wim Bogaerts {4, 5}, Niels Quack {2,6}, and Frank Niklaus {1}
Affiliations:
{1} KTH Royal Institute of Technology, Stockholm, Sweden
{2} Ecole Polytechnique Fédérale de Lausanne, Switzerland
{3} Tyndall National Institute of Technology, Cork, Ireland
{4} Interuniversity Microelectronics Centre, Leuven, Belgium
{5} Ghent University - IMEC, Dept. of Information Technology, Belgium
{6} The University of Sydney, Australia

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Nanofabrication is the cornerstone of nanotechnology. I will present the state of the art progress of nanofabrication using helium ion microscope. The first progress is a newly invented 3-D silicon nanofabrication methodology based on the silicon substrate swelling phenomenon due to helium ion implantation [1]. Incident helium ions disrupt single-crystal silicon lattice and form bubbles and eventually lead to material swelling. The spherical shape formed using this methodology features super small roughness ~ 0.1 nm almost 100 times smaller than that of structures produced by other 3D nanofabrication technology, which shows promise in producing wear-resistant nano-spherical atomic force microscope probes [2-3]. Furthermore, substrate swelling is also employed to fine-tune critical feature of nanodevices such as nanogaps from 200 nm to sub-5 nm. The second progress is to use helium irradiation to induce chemical etching of silicon, a technology called Helium ion-bombardment enhanced etching (HIBEE) [4]. Incident helium ions can disrupt silicon-silicon bonds and generate more dangling bonds of silicon, which increases the etching rate of silicon in the mixture of hydrofluoric acid and hydrogen peroxide by more than 200 times. Therefore, silicon nanostructures can be produced by exposing desired regions to helium ion irradiation and etching in the etchants. Only irradiated silicon can be etched while non-irradiated silicon remains almost intact. Nano-electro-mechanical devices such as nanofluidic channels and nano-resonators can be produced with less steps using this technology. In addition, we demonstrate nanofabrication directly on 3D micro/nano surfaces, such as an atomic force microscopic probe, which is challenging for conventional nanofabrication due to the requirement of photoresist spin coating.

Biography
Dr. Huan Hu received his B.S., M.S., from Tsinghua University (2003, 2006) and Ph.D. from UIUC (2014) in Department of Electrical and Computer engineering. He conducted postdoctoral research training at IBM T. J . Watson Research Center. He has been with the joint institute of Zhejiang University and University of Illinois at Urbana-Champaign (ZJUI Institute) since 2017 as a tenure-tracked assistant professor, assistant dean, and deputy office director in the office of academic affairs. His research interests include advanced micro/nanofabrication, bioinspired sensors, and lab on a chip integrating nanotechnology. He has published more than 60 international journal articles (SCI indexed) and 200 international conference proceeding papers, and is the inventor for 18 granted U.S. patents and 5 granted Chinese patents. He invented a methodology of producing nano-spherical probes and founded a startup company based on this invention. He has won the Excellent Paper Award in iCANX Summit 2022 and the First Prize in The 5th University Alumni Entrepreneurship Competition & The Invitational Tournament for Global Prestigious Universities. As of Jan 2023, his total citation is more than 1261 and h-index is 18. He serves as the associate editor in the board of sensor devices (specialty section of Frontiers in Sensors) and is an editorial board youth members for Nanoatechnology and Precision Engineering.

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Abstract
Cell growth rates exhibit intrinsic cell-to-cell variability, which influences cell and population fitness. In many cancers, such as leukemias, cell-to-cell growth variability can impact drug treatment response because cancer cells can temporarily enter a non-genetic low-growth state, where cells are more resilient to chemotherapy. Whether this variability arises from cell division events, continuous growth fluctuations, or more complex nonlinear dynamics is not known. Here, to obtain quantitative insight into the structure of cell growth, we utilize the suspended microchannel resonator (SMR) which is a fluid-filled cantilever capable of measuring cell buoyant mass by the change of SMR resonant frequency. We tracked lymphocytic leukemia cell mass growth along ancestral lineages with a temporal resolution of ~1 min. Utilizing a Gaussian process regression analysis, we isolate fluctuations in instantaneous growth rates from overlapping deterministic growth patterns. The isolated growth fluctuations do not display detectable patterns, account for 30% of instantaneous growth rate variability, and display a relaxation timescale of ~4 hours, thereby explaining the lack of growth memory across generations. Moreover, we observe that cell-to-cell growth rate variability within ancestral lineages is predominantly due to the continuous growth fluctuations within the cell cycle, rather than variation introduced at cell division.

Biography
Dr. Joon Ho Kang received his Bachelor’s degree in physics, minor in math, from Columbia University in 2012. He then received his Ph.D. in physics, with a specialty in biophysics, from Massachusetts Institute of Technology (MIT) in 2019. In 2019 fall, he joined Korea Institute of Science and Technology (KIST) as a part of the military service. Since 2021, he has been a senior research scientist in the Brain Science Institute at KIST. His research mainly focuses on the development of precision biosensing technologies to quantify the physics of living systems at the single-cell level.

Abstract
Microscale needle-electrode devices have been used for recording high spatiotemporal neuronal signals within the brain tissue. However, the electrode geometry should be miniaturized to < 10 µm to reduce tissue damage. This talk introduces a silicon growth technology, which achieves 5-µm-diameter needle-electrode arrays. Our electrode device implanted in the brain of a mouse showed chronic recording capability for 6 months. This talk also addresses a device assembly technique, in which an amplifier module is stacked on the electrode. This device technique allows us to further miniaturize the needle-electrode to < 1 µm for damage-reduced neural recording and chronic applications.

Biography
Takeshi Kawano received his M.S. degree in Electrical and Electronic Engineering in 2001 and a Ph.D. degree in Electronic and Information Engineering in 2004, all from Toyohashi University of Technology, Aichi, Japan. From 2004 to 2005, Kawano was a postdoctoral research fellow at the Toyohashi University of Technology. From 2005 to 2007, he joined the Department of Mechanical Engineering and Berkeley Sensor and Actuator Center (BSAC) at the University of California Berkeley as a postdoctoral researcher. In May of 2007, he joined the faculty of Toyohashi University of Technology, where he is currently a Professor of Electronics-Inspired Interdisciplinary Research Institute (EIIRIS) and Department of Electrical and Electronic Engineering. Kawano's current research interests focus on micro and nanoscale approaches for neural interface devices, brain-machine interfaces, and their medical applications.

Abstract
Organic-inorganic hybrid perovskites (OIHPs) are a fascinating class of semiconductors that can be low- temperature synthesized, crystallized and processed on a large variety of substrates, and at the same time offering outstanding optical and electronic properties, such as broadband spectral tunability, high defect tolerance, high absorption/emission efficiency, room-temperature excitons, etc. These advantages allow OIHPs to complement conventional inorganic semiconductors (e.g., Si and GaAs) in photonics applications that require low-cost, large active area, wide spectral or polarization tunability or flexibility in substrate selection. In this talk I will give a few examples on OIHP based photonic devices, including LEDs, photodetectors and lasers. First, I will discuss how the notorious instability problems of OIHP LEDs may be addressed through surface molecular passivation. By treating the perovskite surface with phenylalkylammonium iodides (PAAIs), molecules consisting of a benzene ring, an alkyl chain and an amine tail we managed to simultaneously achieve a record T50 half-lifetime of 130 hrs under 100 mA/cm² (accelerated testing) and a record radiance of 1282.8 W/(sr × m2) for near-IR OIHP LEDS. The finding of the PAAI was enabled by a fundamental study combining experimental characterization and theoretical modelling, which reveals that the stabilization effect of the passivation is governed by the steric hindrance of the molecules to reconfiguration for accommodating ion migration from the perovskite surface. Secondly, I will focus on the commonly seen gain – bandwidth trade-off problem of photodetectors and introduce a monolithically integrated photovoltaic transistor (PVT) design to solve this dilemma. The PVT exploiting a lead halide perovskite as the photoactive layer achieved a record high gain – bandwidth product of ~ 10¹¹. Finally, I will talk about our recent exploration of using quasi-two- dimensional Dion-Jacobson (DJ) phase perovskites for laser application. With properly selected organic spacers, DJ phase OIHPs offer excellent chemical resistance and thermal processability. These properties allow us to achieve optically pumped perovskite lasers with record-high quality factor, record-low lasing threshold and excellent operational stability.

Biography
Prof. Ni Zhao received her Ph.D. degree in Physics from University of Cambridge in 2008. From 2008-2010 she worked as a postdoctoral research associate at Massachusetts Institute of Technology. She joined the Department of Electronic Engineering at CUHK in 2010 and is now a Full Professor. Her recent work focuses on development of low-cost energy harvesting devices, nanostructured optoelectronic devices and sensors for biomedical applications. Her research to date has generated over 170 journal publications, with an h-index of 64. Prof. Zhao was listed as Highly Cited Researchers 2018 by Clarivate Analytics and is a Fellow of Royal Society of Chemistry and a member of The Hong Kong Young Academy of Sciences.

Abstract
Can 3D printing realize the mass customization of photonic devices? A key prerequisite is to acquire both high spatial precision and material diversity in the manufacturing process. I will present our research works on the development of a meniscus-guided 3D printing method for fabricating various photonic devices. The key idea is to exploit a femtoliter ink meniscus to confine/guide material crystallization/assembly in three-dimension with the aid of solvent engineering. This approach provides a 100-nm spatial resolution and a wide range of printable optical materials such as metal halide perovskites, dipeptides, plasmonic clusters, NV-center nanodiamonds, and so on. The developed method has enabled the 3D printing of various components and devices such as display pixels, anticounterfeiting labels, biosensors, quantum qubits, and so on. In this talk, I will discuss the prospects of our work for diverse research areas, such as photonic circuitry, life science, analytical chemistry, and telecommunications.

Biography
Dr. Ji Tae Kim is an Assistant Professor of the Department of Mechanical Engineering at the University of Hong Kong. Born and raised in South Korea, he received his B.S. and Ph.D. degrees from Pohang University of Science and Technology (POSTECH) in 2006 and 2011. He conducted postdoctoral research at Max Planck Institute for the Science of Light and at Max Planck Institute for Intelligent Systems. Prior to joining HKU, he was a Senior Researcher at Korea Research Institute of Standards and Science. His research focuses on the development of new-paradigm 3D printing methods for nanoscale manufacturing of electronic and photonic integrated circuitries. He has published over 45 peer-reviewed papers in high-profile, cross-disciplinary journals such as Nature Communications, Advanced Materials, ACS Nano, Nano Letters, Advanced Science, Small, and so on, and relevant patents. Since joining HKU in 2016, he has been awarded highly competitive external research grants including 5 RGC GRF, 1 NSFC/RGC JRS, and 1 ECF grants, in the capacity of PI. He served as a Session Chair for IEEE NanoMed 2021 and Materials Research Society Fall Meeting 2019 and a Co-Organizer for Colloid & Interface Symposium 2019.

Abstract
Integrated photonics technology has recently become the strongest candidate for realizing a fault-tolerant, practical quantum computer. Particularly, integrated photonics allows putting together millions of quantum photonic devices on a tiny chip, which is crucial to increasing the computational capacity. The potential of integrated photonics is not just limited to quantum computing, it also extends to sensors for consumer health care, LiDAR for autonomous vehicles, and many more. One key missing photonic device in the integrated photonic chips is an on-chip light source, which is arguably the most important building block for realizing all required functionalities. The challenge of building on-chip light sources arises from the fact that the materials used in Si photonics foundries such as Si, Ge, Si3N4, and SiO2 are not suitable for generating photons.
In this talk, we discuss our latest research progress on building integrated light sources primarily by using strain engineering technologies. We first showcase several on-chip Ge and GeSn lasers with various functionalities including nonlinear second-harmonic generation. We then present strained graphene technologies that provide guidance towards building on-chip graphene light sources. Our work may help with completing the last missing link for realizing disruptive quantum photonics processors.

Biography
Donguk Nam is currently an Assistant Professor at the School of Electrical & Electronic Engineering (EEE) at Nanyang Technological University (NTU), Singapore. He received his Ph.D. (2014) and M.S. (2012) degrees both in the Department of Electrical Engineering from Stanford University and had a B.Eng. degree from Korea University (2009). After working as a postdoctoral scholar at Stanford University for one year, he joined Inha University, South Korea, as an Assistant Professor. In 2017, he joined NTU as an Assistant Professor. His research works focus on developing and harnessing unique strain engineering techniques for the realization of unprecedented integrated light sources for optical and quantum computing technologies. His recent work has been published in high-impact journals including Nature Communications and has been highlighted by a number of media and magazines including Optics and Photonics News (OPN).

Abstract
Various functional systems have been successfully integrated in a contact lens for various purpose such as monitoring diseases and drug delivery. Despite successful demonstration such functions, power supply to smart contact lens has rely on mostly bulky wireless power transmission. Batteries have proved their reliability in the market for several decades. However, safety issues still hinder their utilization to smart contact lens. The flammability of lithium-ion battery materials and their aggressive reaction with water can cause them to catch fire or explode inside the body. Aqueous batteries, such as alkaline batteries, so-called dry cells, and nickel metal hydrate batteries carry much less risk of fire or explosion, but acidic and basic electrolytes with highly concentrated salts can cause serious injury upon leakage.
In this talk, I would like to introduce a flexible aqueous battery operating in tears solution (saline water) for safe power supply to a smart contact lens [1]. Prussian blue analogue (PBAs) known as biocompatible Na-ion or K-ion hosing material were used as cathode and anode materials for operation of the cell in tear solution with low concentration of Na-ion and K-ion. Carbon nanotube (CNT) and PBA composite flexible electrode was embedded in Ultraviolet (UV) polymerized hydrogel of a soft contact lens. The fabricated battery successfully operated an IC device and exhibited mechanical stability for bending and biocompatibility. We believe that our tear-based battery can provide ultimate safety for power supply to smart contact lenses.

Biography
Seok Woo Lee is an assistant professor in the School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore. He received his B.S. from mechanical engineering in POSTECH, Korea in 2003 and his Ph.D. from mechanical engineering in KAIST, Koare in 2008. Then, he worked as a postdoctoral scholar and a research associate at Stanford University for about 6 years. His research interests are in electrochemical systems for energy conversion and storage and their miniaturization using MEMS fabrication.

Abstract
We present a fiber-based approach to generate femtosecond pulses in the 3–4 µm range. This is achieved by frequency-down converting near-infrared pump in a gas-filled hollow-core fiber via nonlinear effects. The wavelength depends solely on a fiber’s structural parameter, making it possible to engineer the output through geometrical tuning. The high power-handling capability of hollow-core fiber means that the system can easily be power-scaled by increasing either the pump pulse energy or the repetition rate. This, combined with a rapid advance in high-power near-infrared fiber lasers, offers a promising platform for all-fiberized ultrafast mid- infrared source at unprecedented power levels. We expect the new technique to find many applications in ultrahigh sensitive molecular sensing.

Biography
Dr. Wonkeun Chang received his B.Tech. in Optoelectronics and M.Sc. in Physics from the University of Auckland, and Ph.D. in Physics from the Australian National University. He then joined the Max Planck Institute for the Science of Light, where he developed expertise in light-matter interactions in hollow waveguides. In 2013, Dr. Chang was granted a Discovery Early Carrer Research Award from the Australian Research Council, and led a project on complex pulse dynamics and extreme events in ultrafast laser systems at the Australian National University. He is currently a Nanyang Assistant Professor at the School of Electrical and Electronic Engineering in Nanyang Technological University, Singapore. His research interests are in specialty optical fibers, novel light source development and femtosecond laser systems.

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Biography
Prof. Teun-Teun Kim is an Assistant Professor in the Department of Physics at University of Ulsan. He received his Ph.D. in physics from the Korea Advanced Institute of Science and Technology (KAIST) in 2010. He then held research fellow position at KAIST from 2010 to 2013, at Univ. of Birmingham, UK from 2013 to 2017, and at Sungkyunkwan Univ(SKKU) from 2017 to 2020. He was awarded NRF postdoctoral fellowship (2012), Marie Curie Fellow (2014), and IBS Young Scientist Fellowship (2016). Prof. Kim's work on Graphene Metamaterials was selected as "Best Basic Research 50 for 2013" by NRF (National Research Foundation) and introduced in Science and Nature Photonics, and Graphene Metalens's work was selected as "Best Research 10 for 2017" by IBS and received numerous media coverage. His current research focuses on photonic devices by using Non-Hermitian and topological physics with metamaterials and plasmonics, and 2D materials photonics including graphene and transition metal dichalcogenide.

Abstract
Opto-electronic performance-enhancement of photodetector is one of the important things that attracts a lot of attention from academic and industrial fields, because it can realize the high performance optical applications, such as remote sensing, thermal imaging, environmental monitoring and communications. Here, we present the recent approaches to improve the performances of visible light photodetector, such as sensitivity, detectivity, and response time, based on 3D geometric design of nanostructure. First, we introduce the 3D granular design methodology of copper-oxide (CuO) thin film, improving the sensitivity and detectivity of the photodetector. Then, we also show the geometrically 3D designed CuO nano-wire array for the further drastic performance-enhancement of the device. Finally, we introduce a novel method of the 3D nano-structure based on machine learning for the cost-effective design-optimization of the photodetector. As an application of the 3D designed nano-structure, we also show the recently developed hydrogen (H2) gas sensor. The chemo-mechanically designed 3D palladium (Pd) nano-structure on a polymer nano-grating template is utilized for the demonstration of the power-efficient and durable optical type H2 gas sensor, potentially essential for addressing safety issue in H2 gas energy applications.

Biography
Min‐Ho Seo received his B.S. degree (Magna cum laude, 2011) in nanomechatronics engineering from Pusan National University and received his M.S. and Ph.D. degrees (2013 and 2018, respectively) in electrical engineering from the Korea Advanced Institute of Science and Technology (KAIST). From 2018 to 2019, he was a postdoctoral research fellow at the Information and Electronics Research Institute at KAIST. From 2019 to 2020, he joined in the Center for Bio‐integrated Electronics (CBIE, Rogers group) at Northwestern University in the United States as a postdoctoral researcher. Since 2020, he has been with the School of Biomedical Convergence Engineering, Pusan National University, where he is currently an assistant professor. His research interests include nano/microelectromechanical systems (N/MEMS), biomedical devices and electronics, flexible and wearable electronics, and physical, chemical, hydrogen, and optical sensor devices and electronics.

Abstract
The diverse vision systems in nature can provide attractive design inspiration for imaging devices, ranging from optical subcomponents to digital cameras and visual prostheses, with more desirable optical characteristics than conventional imagers. The advantages of natural vision systems include high visual acuity, wide field of view, wavelength-free imaging, improved aberration correction and depth of field, and high motion sensitivity. Recent advances in soft materials, ultrathin electronics, and deformable optoelectronics have facilitated the realization of novel processes and device designs that mimic biological vision systems. This tutorial introduces recent progress and continued efforts in the research and development of bioinspired artificial eyes. At first, the configuration of two representative eyes found in nature: a single-chambered eye and a compound eye, is explained [1, 2]. Then, recent advances in bioinspired optic components and image sensors are discussed regarding materials, optical/mechanical designs, and integration schemes [3-5].

Biography
Young Min Song is a professor in the School of Electrical Engineering and Computer Science and AI Graduate School at the Gwangju Institute of Science and Technology (GIST), Korea. Before joining the GIST, he was an assistant professor at the Pusan National University from 2013 to 2016. He received a M.S. and Ph.D. in Information and Communications from the Gwangju Institute of Science and Technology (GIST) in 2006 and 2011, respectively, after a B.S. degree in Biomedical Engineering from the Yonsei University in 2004. From 2011 to 2013, he was a postdoctoral research associate in the Department of Materials Science and Engineering at the University of Illinois at Urbana–Champaign. Dr. Young Min Song’s research interests include advanced optoelectronic devices/systems, multifunctional nanophotonics, and optical healthcare systems. He is a senior member of Optica, a member of SPIE, and MRS. He is serving as a senior editor of the IEEE Photonics Journal and an editorial board member of the Journal of Optical Microsystems (JOMs) and Soft Science. He is a member of the Young Korea Academy of Science and Technology(Y-KAST).

Abstract
Today, using microendoscopes or endoscopes enable accurate early cancer detection and precise tumor resection. Due to various technical challenges, MEMS scanner-based microendoscopes are rarely translated into the clinic or applied to human patients. However, through a synergistic collaboration, we have developed a three-dimensional (3D) multispectral MEMS scanner-based dual-axis confocal microendoscope (640 nm and 780 nm) for translational applications such as colorectal cancer screening and staging and molecular imaging. Both axes of rotation of the MEMS scanner can achieve mechanical scan angles greater than 6 degrees in both DC and resonant scan modes. Mirror surfaces were coated with gold to achieve a reflectivity of over 80% in the near infrared range. Using an advanced computational imaging approach, the scanner can perform real-time cross-sectional imaging with either raster or Lissajous pattern scanning at fast frame rates (>10 Hz) and large fields of view (>600 microns). An advanced real-time mosaic algorithm has been developed to achieve a wider field of view in the millimeter range. Using molecular contrast probes conjugated with fluorescent dyes, we have successfully demonstrated ex vivo and in vivo multispectral imaging in small animal tumor models and human tissue samples. We have also demonstrated early cancer detection and surgical navigation based on molecular biology imaging.

Biography
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Abstract
Many attempts have paid to the development of low powers consumption and highly sensitive gas micro-nano sensors towards different applications including of air pollution monitoring, and breath analysis. Advanced nanomaterials of 1D and 2D materials have been widely applied in gas sensors, but the limitation of low sensitivity, and low selectivity as well as high power consumption limits their potential applications. In this talk, I will introduce our cutting-edge research on the i) controlled synthesis of advanced nanomaterials for gas sensors; ii) designed of new sensor structure with novel working principle for low power consumption, and iii) functionalization to enhance the sensitivity. Our study targets to the controlled synthesis and doping of one-dimensional (1D) metal oxides (WO3, SnO2, ZnO), and two-dimensional (2D) transition metal dichalcogenides (TMDs) to explain the role of doping elements to the fundamental properties of the host materials. We pointed out that the new phenomena of undoped and doped materials enable the fabrication of high-performance gas nanosensors with small size, low power consumption, low gas detection limit, high sensitivity, and high selectivity based on novel design of 1D and 2D materials will be achieved to open a new strategic application in environmental monitoring and exhaled breath analysis. We also combined the artificial intelligence to classify the mixed gases for actual application in portable devices.

Biography
Nguyen Duc Hoa obtained his PhD degree in Materials Science and Engineering in 2009 at Chungnam National University, Korea. He awarded JSPS fellowship and conducted research at National Institute for Materials Science (NIMS, Japan) from 2009 to 2011. He has been appointed as honorary doctor in 2022, Uppsala University (Sweden). He is a member of editorial board of the Journal of Science: Advanced Materials and Devices (Q1); and JST: Smart Systems and Devices. Advisory board of the National Foundation for Science and Technology. Currently, he is a Full Professor in Physics, and Deputy Director of International Training Institute for Materials Science (ITIMS) at Hanoi University of Science and Technology, Vietnam. His research activity has covered a wide range of nanostructured materials from synthesis, fundamental studies, and applications (chemical sensors, biosensors, gas nanosensors etc.). He has published more than 100+ SCI papers with total citation of about 6000+. His H-index is 47 (google scholar). He has received many awards including the National Prize for Science and Technology (2021).

Abstract
Chemiresistive sensors that respond to changes in local chemical environment by changing electrical resistance are low-cost and distributable alternatives to expensive and stationary laboratory-based analytical instrumentation. Single-walled carbon nanotubes (SWCNTs) are a particularly attractive chemiresistor platform owing to inexpensive fabrication, room- temperature operation, as well as ultra-low power requirements.¹ This presentation will detail efforts to hybridize SWCNTs with molecular selectors that engage environmental pollutants such as methane (CH₄) and hydrogen sulfide (H₂S) in catalytic aerobic oxidation under ambient conditions.^2,3 We show that SWCNT-poly(4-vinylpyridine) composites containing molecular bipyrimidine platinum polyoxometalate precatalysts (SWCNT-P4VP-Pt-POM) undergo redox cycling during analyte oxidation, thereby modulating SWCNT doping and triggering chemiresistive response. Further, we demonstrate that tuning of the constituent POM composition H_(3+n)[PV_nMo_(12-n)O₄₀] (n = 1 – 4) is an effective strategy for adjusting the oxidative reactivity of the selector, thereby enhancing its sensing performance. Our results demonstrate that concepts in molecular oxidation catalysis can be leveraged to develop low- power, low-cost and potentially distributed sensors for selective gas detection. In closing, current efforts of the newly established Bezdek Research Group will be highlighted in the area of environmental pollutant sensing.

Biography
Máté earned his B.Sc. (Hons.) in Chemistry from the University of Calgary in 2014, where he worked with Profs. Curtis Berlinguette and Warren Piers on the syntheses of ruthenium dye complexes for dye-sensitized solar cells and perfluorinated aryl boranes, respectively. Máté then pursued graduate studies at Princeton University with Prof. Paul Chirik. Máté’s graduate work explored proton-coupled electron transfer in molybdenum complexes relevant to the interconversion of ammonia with its elements as well as its application to organometallic chemistry. For his dissertation, Máté was awarded the Porter Ogden Jacobus Fellowship, Princeton’s top honor for PhD students. After receiving his PhD in June 2019, Máté joined Prof. Timothy Swager’s group at MIT. There, he utilized concepts in molecular aerobic oxidation catalysis to develop gas sensors for the detection of environmental pollutants such as methane and hydrogen sulfide. Following his postdoctoral appointment, Máté joined ETH Zürich as a Tenure-Track Assistant Professor of Chemistry in the fall of 2021, where his research group’s interests span organometallic chemistry, carbon nanomaterial-metal hybrids and stimuli-responsive materials.

Abstract
Adsorption/combustion-type micro gas sensors, which were fabricated by utilizing the microelectromechanical system (MEMS) technology and an oxide-film fabrication technique by drop coating, are quite promising as gas-sensing devices for detecting a low concentration of various volatile organic compounds (VOCs). The sensor structure is basically similar to that of catalytic combustion-type gas sensors, but the gas-sensing concept is quite different from that of the catalytic combustion-type gas sensors. VOC molecules are firstly adsorbed on the surface of both catalytic and reference films at lower temperatures (e.g., 150°C for 9.6 s), and subsequently their dynamic combustion induced by abruptly rising temperature by pulse heating (e.g., 450°C for 0.4 s) mainly on the catalytic film achieves the large dynamic VOC responses. For example, we have recently reported that the co-loading of Pt and metal oxide (e.g., CeO2 or Bi2O3) onto γAl2O3 (substrate of the catalytic film) was quite effective in improving the dynamic sensing properties to various VOCs, and that the catalytic combustion activity as well as the adsorption property of the VOCs over the catalytic film were quite important factors in determining their dynamic VOC response behavior. The latest dynamic VOC-sensing properties of the adsorption/combustion-type gas sensors will be presented in this paper.

Biography
He received B. Eng. Degree in Applied Chemistry and M. Eng. Degree in Materials Science and Technology in 1992 and 1994, respectively, and Dr. Eng. Degree in 1997 from Kyushu University. He is then served as a research associate from 1997 to 2006, an assistant professor from 2006 to 2010 at Nagasaki University, and now an associate professor from 2010 at Nagasaki University. He has received some awards as follows,
- Sano Award for a young distinguished researcher from the Electrochemical Society of Japan in 2002
- Distinguished Paper Awards from The Electrochemical Society of Japan in 2001 and 2005
- Seiyama Award from Japan Association of Chemical Sensors, The Electrochemical Society of Japan in 2010
- Best paper presentation in 9th Asian Conference on Chemical Sensors (ACCS 2011) in 2011
- Award for Academic Achievements in Ceramic Science and Technology from The Ceramic Society of Japan in 2021
He published over 120 peer-reviewed papers and holds 25 domestic and international patents. He has currently interested on development of various electrochemical devices such as chemical sensors (mainly, gas sensors), secondary and lithium-ion batteries as well as design of the related mesoporous and macroporous materials.

Abstract
Acetone is a major byproduct of lipolysis, which is excreted via exhaled breath due to its high volatility. Accordingly, exhaled breath acetone analysis using portable sensors could be a non-invasive, always accessible technique to in-situ monitor fat burning during exercise and dieting. However, implementing this technology remains a significant challenge due to the lack of sensing materials that can detect acetone selectively in a complex gas mixture like human breath. Herein, we suggest ferroelectric ε-WO3 nanospheres as a novel sensing material for ultraselective and sensitive detection of acetone. Acetone is a polar gas with a high dipole moment of 2.88 D. Thus, the key idea is to facilitate a strong interaction of polar acetone to the sensing surface using polarized ferroelectric domains. The ferroelectric ε-WO3 was prepared by doping Nb and Ti into γ-WO3 via the ultrasonic spray pyrolysis method. The acetone selectivity of the ε-WO3 sensors was significantly higher than any other values reported in the literature, and the acetone response was sufficiently high to monitor breath acetone at ppb levels, even under highly humid conditions. The correlation between the ferroelectric properties and gas sensing characteristics was investigated by measuring the spontaneous polarization, and the acetone adsorption ability of the ε-WO3 nanospheres was evaluated via temperature-programmed desorption analysis. This work will provide a novel strategy for designing highly selective oxide semiconductors and facilitate the development of a new class of portable breath acetone sensors for monitoring fat burn efficiency.

Biography
Prof. Ji-Wook Yoon received his B.S. and M.S./Ph.D. integrated degrees from Korea University in 2011 and 2017, respectively. He was a research associate at ETH Zürich (Switzerland) from 2017 to 2018 and a research professor at Korea University from 2018 to 2019. He has been with the department of information materials engineering, division of advanced materials engineering at Jeonbuk National University since 2019 and is currently an assistant professor. His research interests are gas adsorbents, oxidation catalysts, dielectric materials, and nanomaterial-based sensors for environmental and healthcare applications.

Abstract
Detection of ionic species in solution is important for various applications such as biology, health, environment, food industry, and military. Real-time wireless sensing of analyte is particularly useful for fast screening and recognition of specific ions in unknown solutions. We have developed chemiresistive-type ion sensors using carbon nanotubes functionalized with chemical selectors, which can be integrated with IoT technology.
In this presentation, I will introduce recent research progress of the development of chemical sensors using functional carbon nanotubes for detection of ionic species. The research provides two approaches: i) synthesis of chemical selectors and ii) development of the chemiresistive-type sensor. Firstly, various types of selectors were developed to induce sensitive and selective chemical interactions with analytes. Systemic analysis was performed using spectroscopy titration techniques to evaluate the binding affinity between selectors and ionic species. Secondly, chemiresistive-type sensors were developed for real-time wireless sensing applications, wherein the selectors were functionalized onto carbon nanotubes to transduce chemical interaction into an electrical signal. The research provides insights about designing selector molecules and their functionalization techniques onto carbon nanotubes for transduction into electrical signals, which can contribute to the development of chemiresistive-type ion sensors.

Biography
During his M.S. research, Seon-Jin Choi worked on the development of high-k dielectric materials, particularly applicable in RF MEMS-switched capacitors having high capacitance and high self-resonant frequency. During his Ph.D. research, he focused on the diverse synthesis methods for one-dimensional semiconductor metal oxides (SMOs) that can be applied in the pattern recognition of breath biomarkers for the diagnosis of diseases. He established diverse sensing material libraries based on electrospun SMOs nanofibers. He invented an organic templating route to obtain porous SMO nanostructures for high response and fast detection capabilities toward breath components. From his research performances, he received several awards including the Excellence Award at ‘Competition of University Creative Invention 2012’ in 2012, Best Award at ‘9 th Samsung Inside Edge Paper Competition’ in 2013, and Silver Award at ‘21 st Samsung Human Tech Paper Competition’ in 2015.
During his post-doctoral research at KAIST, he developed flexible and wearable chemical sensors on a colorless polyimide film. He studied the reaction kinetics of chemical gas species on sensing layers including graphene-based layers as well as metal oxide nanosheets under different film temperatures to achieve a reversible chemical reaction. His research at MIT focused on the development of an anion sensing platform to monitor water quality with low cost and rapid detection in the solution environment. With his sensing platform, molecular interaction between anions and receptors was transduced into an electrical signal with multiplexed anion detection capability.
His current research interests include the design of molecular receptors, organic/inorganic nanomaterial synthesis, nanofibers for chemical sensors, transparent electrodes, flexible and wearable chemical sensors, and ion sensors for applications in environmental monitoring and healthcare. His work focuses on the synthesis of hybrid nanomaterials (i.e., metal-organic frameworks, metal chelating polymers, and conductive carbon-based materials) and their applications for onsite electrochemical detection of heavy metal ions (HMIs) in the natural water environment to ensure safe drinking water for the sake of human health.

Abstract
Understanding the surface chemistry of target gases on sensing materials is important for designing high-performance gas sensors. Operando UV-vis and DRIFT spectroscopy were used to study the ethanol gas sensing mechanism of SnO2-based materials. The catalytic reaction over oxide materials was also studied by DRIFT spectroscopy combined with online FT-IR gas analysis. The results show that ethanol reacts with Pt-loaded SnO2 nanocrystals to produce intermediate species such as acetaldehyde, acetate, and carbonate, which generates a high sensor response to ethanol in air.

Biography
Dr. Tetsuya Kida has been a full professor of Department of Applied Chemistry and Biochemistry at Kumamoto University, Japan since 2013. He received his MS degree and Dr. Eng. degree in Materials Science from Kyushu University in 1996 and 2001, respectively. His current research interests include the synthesis and applications of semiconductor nanocrystals, gas sensing with metal oxides, and applications of graphene oxide for energy applications.

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Biography
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Abstract
Immersive multimedia for five senses can provide user experience by stimulating memory and sensation. In case of olfactory-enhanced multimedia, a computer-generated smell is combined with additional media content to create a richer and/or realistic experience for the user. Although several studies have been conducted on olfactory-enhanced multimedia using electronic nose and olfactory display, their practical applications had been severely restricted owing to absence of a related standard.
ISO/IEC 23005[1,2,3], a representative standard related to immersive media, provides normative data templates and commands for sensory effects to immersive multimedia. In particular, this standard specifies information representation which can be used in controlling olfaction related sensors (Electronic Nose) and the actuators (Olfactory Display) contributed by our research team.
This talk presents an encoding method for olfactory information obtained from electronic nose system to transfer for scent display applicable olfactory-enhanced multimedia based on ISO/IEC 23005 normative data template.
An Electronic Nose System to be applied to olfactory interaction requires ISO/IEC 23005 Templates and Encoder. Those templates provide normative data formats which are used to save recognized olfactory information obtained from Electronic Nose and its characteristics. In addition, the main functionality of the encoder is to translate the data saved in the template compliant data formats into XML files.
An experimental work was conducted to acquire olfactory information associated with coffee scents for testing ISO/IEC 23005 compliant Electronic Nose System.

Biography
Hyung Gi Byun is a full professor at the Division of Electronics, Information and Communication Engineering Kangwon National University, Samcheok, Kangwon-Do, South Korea. He received PhD. Department of Instrumentation and Analytical Science from the University of Manchester, UK. His research interests are data analysis and signal processing for intelligent sensing (E-Nose) and actuating (Olfactory Display) systems for medical and entertainment applications including its standardization. He also deeply involved prediction model developments using nano-toxicity and medical data. He has been involved in more than 30 different research projects domestically and internationally. Prof. Byun has authored approximately 100 publications and served as an International Steering Committee Member for IMCS (International Meeting on Chemical Sensors) and Vice-President of ACCS (Asian Conference on Chemical Sensors). He was a president of Korea Sensors Society (KSS) at 2020.

Abstract
Structural evolution of sensing materials under working conditions plays an essential role in the research of gas sensors, especially in revealing the sensing mechanism. The gas-cell in situ transmission electron microscopy (in situ TEM) technique that has emerged in recent years can directly observe the morphology and structural evolution of sensing materials under real working environments (including atmosphere and temperature). For in situ TEM observation, the sensing material to be analyzed can be loaded and sealed in an in situ TEM chip integrated with heating electrodes. The desired gas flow is introduced into the TEM chip via a capillary tube, exposing the material to the working atmosphere. According to the guidance of the in situ TEM results, gas-sensing materials can be rationally optimized. This report will introduce the methods and progress in the study of gas-sensing materials using in situ TEM technique in our lab.

Biography
Pengcheng Xu is a professor at the State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences. He received his Ph. D. degree from the University of Chinese Academy of Sciences in 2016. His present research covers advanced sensing materials, resonant micro-gravimetric sensing effect, and MEMS/NEMS-based bio/chemical sensors. Based on the resonant microcantilevers, he and his group have developed a series of scientific instruments such as cantilever- TGA (cantilever-based thermogravimetric analysis). He holds more 40 patents. He has published more than 100 journal papers and 40 conference papers. He is now a TPC member of the Transducers conference.

Abstract
Metal-Organic Frameworks (MOFs) are emerging as a promising material for various applications, including ion extraction, energy harvesting and sensing. With their high surface areas and tunable pore sizes, MOFs are ideal for ion various applications. In this presentation, first I will highlight the latest developments and advancements in the application of MOFs in sensing. I will focus on their use as the active layer in sensors for monitoring gaseous species such as humidity, volatile organic compounds (VOCs), and toxic gases. Additionally, I will explore their potential in ion-selective electrodes (ISEs) for monitoring ions in solutions. The use of MOFs as ion-to-electron transducers has been found to improve the stability and long-term performance of ISEs. Additionally, I will touch upon our recent findings on the potential of Metal Organic Frameworks in ion extraction and healthcare applications. I will focus on the application of MOFs as effective ion-extracting materials, capable of selectively separating and purifying ions (particularly Lithium) from complex mixtures.

Biography
Mohsen Asadnia is an accomplished biomedical and mechanical engineer currently serving as a professor at the School of Engineering, at Macquarie University. He holds technical expertise in instrumentation, data acquisition and control, applied artificial intelligence, mathematic modelling, MEMS, NEMS and microfabrication. He received his Bachelor's and Master's degrees in Mechanical Engineering. He then pursued his PhD at Nanyang Technological University-Singapore, where he focused on the development of biomimetic microsensors for use in various applications, including healthcare, and robotics. After completing his PhD, Prof. Asadnia joined Massachusetts institute of technology (SMART centre) as a postdoctoral researcher, where he worked on the development of advanced artificial auditory haircell sensors. He then moved on to The University of Western Australia (UWA), where he held the position of assistant professor, responsible for the development of cutting-edge transistor based chemical sensors for use in oil and gas industries. In 2016, Prof. Asadnia was offered a faculty position at Macquarie University, where he has been teaching and conducting research ever since. His expertise in the fields of smart materials, biomedical engineering, micro/nano fabrication and mechatronics has earned him an international reputation as a leading researcher in the field. He has published over 120 research papers and articles in top-tier journals, seven patents and four books. As of Feb 2023, his total citation is more than 4,866 and h-index is 40.

Abstract
As low-cost, fast-prototyping platforms, CMOS-MEMS processes have been used to demonstrate various sensor applications, including temperature, pressure, inertial, mass, magnetic…etc. Among these demonstrations, resonant operation, for which the resonant frequency of the sensor devices is modulated by the target parameters, is often employed to facilitate signal read-out, and improve sensitivity. Over the past decade, sophisticated structural design that uses multi-degrees of freedom (MDOF) micromechanical coupled resonators have been extensively studied to enhance the sensitivity due to the larger dependence of energy localization either between resonance modes or each of the resonators. Based on the work, this presentation will discuss a new class of coupled devices that employ asymmetric structural design, namely tuned-mass-dampers (TMDs), to further boost the sensitivity of resonant type sensors. In fact, for a single uncoupled signal device, nonlinear energy transfer between the resonance modes, aka internal resonance, can also be used to increasing the sensitivity. This talk will cover the recent work done to demonstrate such technique in CMOS-MEMS technology.

Biography
Wei-Chang Li joined the Institute of Applied Mechanics at National Taiwan University in 2016 as an Assistant Professor and became an Associate Professor in 2021. Prior to starting at NTU, he was a MEMS design engineer at mCube Inc., San Jose. He received the B.S. and M.S. degrees in electrical engineering from National Taiwan University, Taipei, Taiwan, in 2003 and 2005, respectively. He received the Ph.D. in electrical engineering from the University of California, Berkeley, in 2015. His research interest focuses on resonant microelectromechanical systems (MEMS) and includes vibro-impact system enabled technologies and zero-power mechanical signal processing/computing.

Abstract
Many biological superhydrophobic surfaces such as lotus leaves, red rose petals, and butterfly wings exhibit hierarchical micro-/nanostructures. Here, I will present two scalable fabrication approaches that can achieve hierarchical micro/nanostructures with superhydrophobic and anti-icing properties. The first approach consists of silicon microstructure etching using a deep reactive ion etch (DRIE) method, nanowires deposition via glancing angle deposition (GLAD) process, and fluorocarbon thin film deposition [1]. Compared with the smooth, microstructured, and nanostructured surfaces, the hierarchical micro/nanostructured surfaces obtained via this method showed the highest water contact angle of ~161° and a low sliding angle of <10°. It also offered long ice delay times of 2313 s and 1658 s at −5°C and −10°C respectively, more than 10 times longer than smooth surfaces. The second approach is a cost-effective and scalable methodology for producing a hierarchical micro-nanostructured silicon surface solely by metal-assisted chemical etching [2]. It involves two major processing steps of fabricating micropillars and nanowires separately. The process of producing micro-scale structures by masked metal-assisted chemical etching was optimized. Silicon nanowires were created on the micropillar’s surface via maskless metal-assisted chemical etching. The hierarchical micro-/nanostructured surface exhibits superhydrophobic properties with a high contact angle of ~156° and a low sliding angle of <2.5° for deionized water. Furthermore, due to the existence of microscale and nanoscale air trapped at the liquid/solid interface, it exhibits a long ice delay time of 2876 s at −5 °C, more than 5 times longer than that of smooth surfaces. Compared to conventional dry etching methods, the metal-assisted chemical etching approach excludes vacuum environments and high-temperature processes and can be applied for applications requiring hierarchical micro-/nanostructured surfaces or structures.

Biography
Dr. Huan Hu received his B.S., M.S., from Tsinghua University (2003, 2006) and Ph.D. from UIUC (2014) in Department of Electrical and Computer engineering. He conducted postdoctoral research training at IBM T. J . Watson Research Center. He has been with the joint institute of Zhejiang University and University of Illinois at Urbana-Champaign (ZJUI Institute) since 2017 as a tenure-tracked assistant professor, assistant dean, and deputy office director in the office of academic affairs. His research interests include advanced micro/nanofabrication, bioinspired sensors, and lab on a chip integrating nanotechnology. He has published more than 60 international journal articles (SCI indexed) and 200 international conference proceeding papers, and is the inventor for 18 granted U.S. patents and 5 granted Chinese patents. He invented a methodology of producing nano-spherical probes and founded a startup company based on this invention. He has won the Excellent Paper Award in iCANX Summit 2022 and the First Prize in The 5th University Alumni Entrepreneurship Competition & The Invitational Tournament for Global Prestigious Universities. As of Jan 2023, his total citation is more than 1261 and h-index is 18. He serves as the associate editor in the board of sensor devices (specialty section of Frontiers in Sensors) and is an editorial board youth members for Nanoatechnology and Precision Engineering.

Abstract
Bone is an active material that adapts itself to external loadings by modulating its mechanical properties through mineralization [1]. In the initial stage of mineralization, it is well known that net-charged amorphous calcium phosphate (ACP) mineral precursors infiltrate into intrafibrillar space through gap regions of a collagen fibril [1], but its underlying driving force has not been fully clarified. Here, we hypothesized that collagen piezoelectricity would locally increase an electrical interaction to help ACP infiltrate into the small gap region in response to loading inputs. To investigate it, we employed advanced piezoresponse force microscopy (PFM) to characterize and compare the piezoelectricity of collagen fibrils extracted from wild type (WT) bone and disease bone, osteogenesis imperfecta (OI) model [2-3], which exhibits abnormal mineralization due to a genetic mutation in collagen. The quantitative PFM successfully identified the anisotropic and heterogeneous nature of the piezoelectric properties correlated with the collagen structure in the WT bone. However, the OI collagen revealed relatively homogenous piezoelectricity, losing the piezoelectric periodicity along the fibril. This result implies that collagen’s piezoelectric periodicity and heterogeneity would be the important mechanism locally modulating the electric interaction to attract and infiltrate the ACP into the gap zones for intrafibrillar mineralization. Thus, losing the piezoelectric heterogeneity in OI indicates that the OI collagen may induce rather uniform mineralization along its fibrils, eventually resulting in homogeneous mechanical stiffness from the fibrillar level.

Biography
Dr. Hanna Cho is an Associate Professor in the Department of Mechanical and Aerospace Engineering at The Ohio State University. Dr. Cho earned BS and MS degrees in Mechanical Engineering from Yonsei University, South Korea in 2002 and 2004, and a Ph.D. at the University of Illinois at Urbana-Champaign (UIUC) in 2012. Cho’s research laboratory, the Micro/Nano Multiphysical Dynamics Laboratory, focuses on studying nonlinear dynamics in micro/nanomechanical systems to utilize beneficial nonlinear characteristics in developing novel Micro-Electro-Mechanical Systems (MEMS) such as sensing, imaging, and energy harvesting; and multi- physical dynamics arising in atomic force microscopy (AFM) to advance state-of-the-art AFM. She is a Young Faculty Award and Director’s Fellowship recipient from Defense Advanced Research Project Agency (DARPA). She received the American Society of Mechanical Engineers (ASME) C.D. Mote Jr. Early Career Award and OSU COE Lumley Research Award.

Abstract
Recent advances in flexible and stretchable electronics have led to a surge of electronic skin (e-skin)–based health monitoring platforms. Conventional wireless e-skins rely on rigid integrated circuit chips that compromise the overall flexibility and consume considerable power. Chip-less wireless e-skins based on inductor-capacitor resonators are limited to mechanical sensors with low sensitivities. I will talk about a chip-less wireless e-skin based on surface acoustic wave sensors made of freestanding ultrathin single-crystalline piezoelectric gallium nitride membranes. Surface acoustic wave–based e-skin offers highly sensitive, low-power, and long-term sensing of strain, ultraviolet light, and ion concentrations in sweat. We demonstrated weeklong monitoring of pulse. These results present routes to inexpensive and versatile low-power, high-sensitivity platforms for wireless health monitoring devices.

Biography
Yeongin Kim joined University of Cincinnati as an Assistant Professor in 2022. Before that, he had worked as a postdoctoral researcher at Massachusetts Institute of Technology from 2018 to 2021. He received a PhD degree in Electrical Engineering from Stanford University in 2018. His research area includes additive manufacturing, heterogeneous integrations, piezoelectric materials, optoelectronic devices, and wearable devices.

Abstract
For the practical use of wearable sensors in daily life and for the accomplishment of great sensor performance, the sensors need to have high mechanical robustness, uniform property, and excellent flexibility. The durability of the wearable sensing devices in terms of reliability is required for biometric applications and vital physiological signal monitoring systems in long term usage. Thus, the mechanical robustness of bionanocomposites from assembly of functional nanomaterials, such as graphene oxide (GO), silk fibroin (SF), and cellulose nanocrystals (CNC), is important to determine the overall performance of the corresponding wearable sensors. In this talk, an introduction on the establishments of bionanocomposites and wearable sensors, the novel approaches to be conducted which might produce outstanding performances, and propose the favorable properties of bionanocomposites with nanomechanical analysis that can bring about significant developments in the field of wearable sensors.

Biography
Sunghan Kim is currently an Associate Professor at the School of Mechanical Engineering, Chung-Ang University. He obtained his B.S. degree in Mechanical Engineering from Hanyang University, South Korea, in 2004, and his M.S. degree in Mechanical Engineering from Pohang University of Science and Technology, South Korea, in 2006 and worked for Samsung Electronics from 2006 to 2011. He received his Ph.D. degree in Mechanical Engineering from Texas A&M University in 2015. He carried out his postdoctoral research at the School of Materials Science and Engineering, Georgia Institute of Technology from 2015 to 2017. His main research interest lies in establishing essential design factors to optimize the interfacial properties of sustainable bionanocomposites for biological, electrochemical, and mechanical applications, and advanced hybrid nanomaterials for sensing.

Abstract
Colloidal nanocrystals have been shown to be promising materials for device applications because of their unique size-dependent properties and solution processability. We present general methods to engineer the electronic, optoelectronic, electromechanical, and electrothermal properties of nanocrystals through their surface and interface engineering. Unconventional materials design and strategy are introduced to fabricate semiconducting devices and wearable sensors. Especially, surface design of nanocrystals are discussed in order to highly sensitive wearable strain gauges, temperature sensors, and tactile sensors with wide sensing range. Interface engineering of nanocrystal thin films are introduced for solution-based fabrication of multifunctional sensors with high pixel density. This technique provides a pathway for designing low cost, high performance, and multifunctional electronic skins or wearable devices with anti-interference.

Biography
EDUCATION
2008.9 - 2014.5 University of Pennsylvania , PA USA
·Ph. D. in Materials Science and Engineering
·Thesis title : Designing Nanomaterials for Electronic and Optoelectronic
  Devices through Charge Carrier Control
2001.3 - 2007.8 Korea University , Seoul Korea
·Bachelors in Materials Science and Engineering

WORK EXPERIENCE
2015.3 - present Korea University, Seoul Korea / Assistant Professor/Associate Professor
·Department of Materials Science and Engineering
2014.7 - 2015.2 University of Illinois Urbana Champaign, IL USA / Postdoctoral Researcher
·PI: Prof. John A. Rogers / Stretchable Electronics
2008.9 - 2014.5 University of Pennsylvania, PA USA / Graduate Researcher
·Advisor: Prof. Cherie R. Kagan
2007.8 – 2008.7 Korea Institute of Science and Technology (KIST), Seoul Korea / Researcher
·Advisor: Dr. K. J. Woo

Abstract
The acoustoelectric (AE) effect describes the interaction between the electric fields associated with a traveling acoustic wave in a piezoelectric material and the mobile carriers in a semiconducting medium. This can be utilized for various sensing applications, in which changes to the conductivity of a thin film on a piezoelectric substrate modifies the propagation loss measured in a surface acoustic wave (SAW) delay line. Recently, non-reciprocal and switchable delay lines have also generated great interest for applications in full duplex radio networks. As a result, AE-based approaches to mitigating signal interference in the RF front end have been sought. Here we will consider the development of a low sheet density AlGaN/GaN heterostructure on sapphire substrates to demonstrate AE amplification of Rayleigh waves. In addition, the use of an atomic layer deposition (ALD) assisted wafer bonding process is demonstrated for integrating thin film silicon on bulk lithium niobate to produce stronger non-reciprocity. These results are developed with regard to implementation in analog correlators and circulators.

Biography
Siddhartha Ghosh is an Assistant Professor in the Department of Electrical and Computer Engineering at Northeastern University. He received the B.S. degree in from Cornell University in 2007, the M.S.E. degree from the University of Pennsylvania in 2011 and the Ph.D. degree from Carnegie Mellon University in 2015, all in electrical engineering. From 2015-2020 he was a member of the Technical Staff at MIT Lincoln Laboratory. He is the author of over 20 journal and conference publications and co-inventor on 3 US patent applications. Since 2018, he has served on the Technical Program Committee (TPC) for the IEEE International Frequency Control Symposium. His research interests include piezoelectric MEMS, optomechanical resonators, oscillator-based computing and acousto-electronic devices.

Abstract
As a consequence of the internet-of-things revolution, the number of connected devices worldwide is expected to increase to 50–200 billion. To maintain such a large network, there is a need for wireless sensors with dimensions and power consumption that are orders of magnitude smaller than the state-of-the-art. Energy is the key challenge. Batteries have limited capacity, and existing sensors are not “smart” enough to identify targets of interest. Therefore, they consume power continuously to monitor the environment even when there is no relevant data to be detected. This talk presents a new class of zero-power microsystems that fundamentally brake this paradigm, remaining dormant, with zero-power consumption, until awakened by a specific physical signature associated with an event of interest. In particular, we demonstrate infrared digitizing sensors that consist of plasmonically enhanced micromechanical photoswitches (PMPs) that selectively harvest the impinging electromagnetic energy in design-defined spectral bands of interest and use it to create mechanically a conducting channel between two electrical contacts, without the need for any additional power source. Such a passive IR digitizer is capable of producing a wake-up bit when exposed to a specific IR spectral signature associated to a target of interest (such as the exhaust plume of a car, a forest fire, or a human body) while rejecting background interference. The capability of these zero-power sensors of consuming power only when useful information is present results in a nearly unlimited duration of operation, with a groundbreaking impact on the proliferation of the IoT. The talk will present the latest research developments and the commercialization opportunities for the technology.

Biography
Matteo Rinaldi is a Professor in the Electrical and Computer Engineering department at Northeastern University and the Director of the Kostas Nanotechnology Laboratory and the Director of Northeastern SMART a university research center that, by fostering partnership between university, industry and government stakeholders, focuses on the discovery, pilot manufacturing and rapid transition of new micro and nano systems technologies that are foundational for emerging paradigms like zero-power sensing, 5G/6G communications, artificial intelligence, quantum information science and nanomedicine. Dr. Rinaldi received his Ph.D. degree in Electrical and Systems Engineering from the University of Pennsylvania in December 2010. He worked as a Postdoctoral Researcher at the University of Pennsylvania in 2011 and he joined the Electrical and Computer Engineering department at Northeastern University as an Assistant Professor in January 2012. Dr. Rinaldi’s group has been actively working on experimental research topics and practical applications to ultra-low power MEMS/NEMS sensors (infrared, magnetic, chemical and biological), plasmonic micro and nano electromechanical devices, medical micro systems and implantable micro devices for intra-body networks, reconfigurable radio frequency devices and systems, phase change material switches, 2D material enabled micro and nano mechanical devices.
The research in Dr. Rinaldi’s group is supported by several Federal grants (including DARPA, ARPA-E, NSF, DHS), the Bill and Melinda Gates Foundation and the Keck Foundation with funding of $30+M since 2012.
Dr. Rinaldi has co-authored more than 200 publications in the aforementioned research areas and also holds 15 patents and more than 10 device patent applications in the field of MEMS/NEMS.
Dr. Rinaldi was the recipient of the IEEE Sensors Council Early Career Award in 2015, the NSF CAREER Award in 2014 and the DARPA Young Faculty Award class of 2012. He received the Best Student Paper Award at the 2009, 2011, 2015 (with his student), 2017 (with his student) and 2020 (with his student) IEEE International Frequency Control Symposiums; the Outstanding Paper Award at the 18th International Conference on Solid-State Sensors, Actuators and Microsystems, Transducers 2015 (with his student) and the Outstanding Paper Award at the 32nd IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2019 (with his student).
Prof. Rinaldi is the co-founder and CEO of Zepsor Technologies, a start-up company that aims to bring to market zero standby power wireless sensors for various internet of things applications including human presence detection, distributed wireless fire monitoring systems, battery-less infrared sensor tags for occupancy sensing and distributed wireless monitoring systems of plant health parameters for digital agriculture.
Prof. Rinaldi is also the owner of Smart MicroTech Consulting LLC, a company that routinely provides consulting services to government agencies, large companies and startups in the broad areas of Micro and Nano Technologies, Internet of Things, Wireless Communication devices and systems, Radio Frequency Devices and Systems and Sensors.

Abstract
The Dreiding force field, which is used in molecular dynamics (MD) simulation was newly developed to predict accurately the thermal properties of semi-crystalline polyetheretherketone (PEEK)/boron nitride (BN) composites. The newly proposed Dreiding force field (N-DFF) gives the best prediction of material properties of BN sheets. The molecular-level structural analysis facilitated the prediction of the thermal conductivity of the optimal structure of PEEK reflecting the best parameter value of the length of amorphous chains, and the ratio of linkage conformations, such as loops, tails, and bridges. In addition, it was found that the long heat transfer paths of polymer chains were induced by the addition of BN sheets, which led to the improvement of the thermal conductivities of the PEEK/BN composites.

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In this study, a novel deep neural network was proposed to predict mechanical behavior of woven carbon fabric reinforced composites. The deep neural network was trained by pre-simulated stress-strain curve database of woven composites depending on their yarn structures and mechanical properties of fiber and matrix. Micro-mechanics based multi-scale analysis of woven composite was conducted for progressive damage analysis of composites considering stress amplification factor between micro-scale and meso-scale simulation and respective failure criteria for fiber and matrix in micro-scale level[1, 2]. The database of stress-strain curves under tensile, compressive and shear loading were acquired depending on the yarn geometries and fiber and matrix properties. Theses variables were used as training input and resulting stress-strain curves were used as training output for deep neural network. For the optimization of deep learning layers, hyper parameters of neural network such as the number of layers and nodes was optimized by Hyperband optimization algorithm. The mechanical tests were performed to validate the predicted mechanical behavior from both simulation and deep neural network. As a results, the stress-strain curves under tensile, compressive and shear loading of arbitrary woven carbon composites could be successfully predicted by deep neural network in several seconds with high accuracy.

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Micro/nanoscale material transfer utilizing controllable interfacial forces provides a highly straightforward pathway to heterogeneous material integration. The speaker presents his research outcomes accomplished in his laboratory which has been exploring smart surfaces, microassembly, and nanomanufacturing technologies. First, he shows reversible dry adhesion-based transfer printing methodologies. In particular, he discusses how to employ an engineered reversible dry adhesive made of a shape memory polymer to advance transfer printing, and highlights its applications including a consumer product-like prototype and LEGO-like microassembly. Next, he introduces a self-delamination-driven pattern transfer of a single crystalline silicon thin membrane via well-controlled interfacial design in liquid media. Finally, he demonstrates his material transfer methods which are further exploited in order to pattern and integrate colloidal quantum dot films. The strategies presented in his talk benefit research activities in smart dry adhesives, 3D MEMS, and nano devices.

Biography
Seok Kim received his B.S. from Pohang University of Science and Technology (POSTECH) in South Korea, M.S. from University of California at Los Angeles, and Ph.D. from Carnegie Mellon University, all in mechanical engineering. After his academic training, he joined the faculty at the University of Illinois at Urbana-Champaign where he was tenured. He recently moved and is currently an associate professor at POSTECH. His current research interests include: 1) biomimetic design of smart surfaces for reversible dry adhesion, tunable wetting and light manipulation, 2) transfer printing-based heterogeneous integration, microassembly, and nanomanufacturing, 3) 3D MEMS fabrication technologies. He was a recipient of the National Science Foundation CAREER Award in 2014, the ASME Chao and Trigger Young Manufacturing Engineer Award in 2015, and the Young Investigator Grant Award from the Korean–American Scientists and Engineers Association in 2015.

Abstract
Soft matter promises great potential for autonomous and intelligent engineering systems when precisely manufactured in specific architectures with programmed responses. Emerging pathway to create such dynamic systems involves additive manufacturing (often called 3D printing) of stimuli-responsive and programmable soft matter. This approach has been recently termed “4D printing”, with the 4th dimension being time.
In this talk, additive manufacturing of various soft matter using projection micro-stereolithography (PµSL) is presented. PµSL is a micro 3D printing technique that turns light into a complex 3D structure by utilizing digital light processing (DLP) technology. Combining rapid, versatile, and scalable micro 3D printing technique with various functional soft matter, design principles and mechanics inspired by exquisite motions and morphologies in nature are physically realized. Micro-architectures that can transform, move, and even jump are demonstrated by programming of dynamic response of various responsive hydrogels. In addition, unprecedented access to micro- and nano-scale afforded by precision micro 3D printing allows for implementation of mechanics-driven design principles in micro-architectures, leading to mechanical properties far superior to those found in nature, such as ultra-low density and high stiffness. Furthermore, geometrically reconfigurable, functionally deployable, and mechanically tunable lightweight material is created through 4D printing with shape memory polymers.

Biography
Dr. Howon Lee is an Associate Professor in the Department of Mechanical Engineering at Seoul National University (SNU). He received his BS (2004) and MS (2006) from SNU, and PhD (2011) from the University of Illinois at Urbana-Champaign (UIUC), all in mechanical engineering. He then held a Battelle/MIT Postdoc Fellow position at MIT from 2012 to 2013. Before joining SNU, he was an Assistant Professor at Rutgers University – New Brunswick, NJ.

Abstract
In recent years, we have witnessed a tremendous demand of electronic devices that leads to a massive amount of e-waste and rapid exhaustion of non-renewable resources. Consequently, green electronics become a promising area to produce eco-friendly devices from natural materials using sustainable fabrication methods. Graphene, a two-dimensional material, exhibits exceptional electrical, mechanical, physical, and thermal properties which make graphene highly attractive for numerous applications. Up to now, graphene can be synthesized via several routes such as liquid-phase exfoliation, mechanical exfoliation, chemical vapor deposition, and reduction of graphene oxide. However, to realize the full potential of graphene, there is an urgent need to develop a cost-effective, scalable, and green fabrication pathway. In this work, we have developed a one-step approach to the preparation of arbitrary graphene patterns on fallen leaves using femtosecond laser pulses in ambient conditions. The formation of laser-induced graphene (LIG) has been confirmed and characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and electrical measurement. Owing to excellent electrical conductivity and highly porous structures, this LIG can be utilized in diverse applications such as supercapacitors, pseudo capacitors, and various types of sensors.

Biography
Prof. Young-Jin Kim is currently is a KWON-OH-HYUN endowed associate chair professor in the Department of Mechanical Engineering and Department of Aerospace Engineering in KAIST, Republic of Korea. He received his B.S., M.S., and Ph.D. degrees from KAIST in 2002, 2004, and 2008, respectively. He worked as a postdoctoral research associate and research professor in KAIST by 2014. He joined Nanyang Technological University (NTU), Singapore as a Nanyang Assistant Professor and NRF Fellow from 2014 to 2019.

He has published more than 110 international journal articles (SCI indexed) and 320 international conference proceeding papers, and holds more than 32 registered domestic and international patents. He is the recipient of Young Scientist Award by Korean President 2021, Optical Technology Innovation Award by OSK 2021, IJPEM-GT Highly Commended Paper Award 2019, Outstanding Presenter Award 2019, Young Researcher Award 2018 and so on. He has served as a committee member of various international conferences and workshops, such as Conference on Lasers and Electro-Optics (CLEO), CLEO-Pacific Rim, International Symposium on Measurement Technology and Intelligent Instruments, ISMTII, PHOTOPTICS, IEEE icOPEN, Advanced Laser and Photon Sources (ALPS). He is an editorial board member of ‘International Journal of Precision Engineering and Manufacturing (IJPEM)’, topical editor of ‘Current Optics and Photonics (COPP)’, guest editor of ‘Sensors’, ‘Photonics’, and ‘Micromachines’.

As of January 2023, his total citation is more than 6,221 and h-index is 35. His research interests are on ‘Ultra-Precision Metrology and Manufacturing (UPM2) technologies using ultrafast femtosecond laser pulses’. Detailed research topics include high-precision dimensional metrology for semiconductor, flat panel display, and precision-engineering products, precision laser manufacturing of flexible/stretchable electronics/optics, and next-generation space metrology missions including high-precision laser ranging for formation-flying satellites, broadband spectroscopy, and high-density free-space communication.

Abstract
In 1960 Feynman gave his famous lecture “There’s plenty of room at the bottom.” With the tireless efforts of the semiconductor industry we can now safely declare that there is no longer much room at the bottom. Inevitably, one must eventually grapple with single atoms. Here too, Feynman presciently asked “What would happen if we could arrange the atoms one by one the way we want them.” In this talk, I will present recent efforts aimed at utilizing the focused beam in a scanning transmission electron microscope as an atomic manipulation tool. The evolution of a system with a highly localized perturbation affords the opportunity for investigating and controlling chemical and physical reactions one the same scale as the perturbation--the scale of single atoms. As a simplified system, graphene is used for the substrate material. We explore how to move and pattern atoms, our approach to integration with operando devices, and perspectives on the future of the field.

Biography
Ondrej Dyck received his PhD in 2015 from the University of Tennessee, Knoxville in materials science and engineering. He currently works as a staff scientist at the Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, USA. His primary research interests are focused on understanding fundamental processes involved in beam-matter-environment interactions to further atom-by-atom fabrication capabilities and their integration with real world devices.

Abstract
Robots with submillimeter dimensions are of interest for applications that range from tools for minimally invasive surgical procedures in clinical medicine to vehicles for manipulating cells/tissues in biology research. The limited classes of structures and materials that can be used in such robots, however, create challenges in achieving desired performance parameters and modes of operation. Here, we introduce approaches in manufacturing and actuation that address these constraints to enable untethered, terrestrial robots with complex, three-dimensional (3D) geometries and heterogeneous material construction. The manufacturing procedure exploits controlled mechanical buckling to create 3D multimaterial structures in layouts that range from arrays of filaments and origami constructs to biomimetic configurations and others. A balance of forces associated with a one-way shape memory alloy and the elastic resilience of an encapsulating shell provides the basis for reversible deformations of these structures. Modes of locomotion and manipulation span from bending, twisting, and expansion upon global heating to linear/curvilinear crawling, walking, turning, and jumping upon laser- induced local thermal actuation. Photonic structures such as retroreflectors and colorimetric sensing materials support simple forms of wireless monitoring and localization. These collective advances in materials, manufacturing, actuation, and sensing add to a growing body of capabilities in this emerging field of technology.

Biography
Dr. Mengdi Han is an Assistant Professor in the Department of Biomedical Engineering, College of Future Technology, Peking University. He received his B.S. degree in Huazhong University of Science and Technology in 2012 and Ph.D. degree in Peking University in 2017. He was a visiting Ph.D. student at Department of Materials Science and Engineering, University of Illinois Urbana-Champaign from 2015 to 2017. He worked as a postdoctoral fellow at Querrey Simpson Institute for Bioelectronics, Northwestern University from 2017 to 2020. He published more than 90 SCI-indexed papers, including Nature Electronics, Nature Biomedical Engineering, Science Translational Medicine, Science Robotics, Proceedings of the National Academy of Sciences, Advanced Materials, etc. His research group aims to develop and build bioelectronics with 3D architectures. The resulting 3D bioelectronics can form conformal interfaces with soft, curvilinear biological tissues, and enable new modalities in diagnosis and therapy.

Abstract
Biofunctional hydrogel microparticles have played a central role in biomedical fields involving drug delivery systems, scaffold materials for in vitro tissue culture and tissue encapsulation for in vivo implantation. Here I introduce recent progress on simple centrifuge-based techniques for synthesizing microparticles (typical diameter: ~100 µm) composed of functional hydrogels. The ejected microdroplets were solidified into hydrogel microparticles by crosslinking using ionic reaction, temperature or UV irradiation. The feature of this particle synthesizing technique is simple, easy-to-use and cost-effective and is applicable to encapsulation of tiny amounts of precious samples in the microparticles. This easiness of the particle synthesis procedures could enable to access to this technique for non-specialists of microfluidic engineers including biological scientists and medical doctors. In this presentation, I introduce the latest advancement of the microparticle fabrication technologies that use phase separation of multiple polymer mixture, and that in-ice polymerization in liquid nitrogen to expand the applicability of materials for the microparticles

Biography
Hiroaki Onoe, received his Ph.D. in Mechano-Informatics at The University of Tokyo under the supervision of Prof. Isao Shimoyama in 2006. Since 2007, he moved to University of California Berkeley and worked with Prof. Richard Mathies in Department of Chemistry as a visiting scholar. Since 2009, he began to work with Prof. Shoji Takeuchi at Institute of Industrial Science at The University of Tokyo as an assistant professor. Since 2014, he has joined to Keio University, Japan, and is now a professor in the Department of Mechanical Engineering. His research interests include microfluidics, biofabrication, functional materials and self-assembly technologies.

Abstract
In the carbon MEMS (CMEMS) process, polymer micro- and nanostructures patterned by photolithography are converted into carbon by pyrolysis at high temperature in inert atmosphere. In this talk, I will present how we have gradually expanded our toolbox for fabrication of 3D pyrolytic carbon micro- and nanoelectrodes exploring methods such as multi-layer UV photolithography, additive manufacturing and direct laser writing. Furthermore, I will provide a few examples of applications in health tech and life science. In bioelectrochemistry, cells are typically incubated on 2D electrodes. The major limitation of this approach is that planar electrode geometry poorly mimics the natural environment of the cells. We address these limitations demonstrating in situ electrochemical analysis of alkaline phosphatase (ALP) activity in a 3D bone tissue model with integrated electrochemical sensing using 3D pyrolytic carbon microelectrodes. Furthermore, we have integrated pyrolytic carbon electrodes on an optical fibre to obtain a leaky optoelectrical fibre (LOEF). With the LOEF serving as a smart scaffold, we demonstrate the combined optical stimulation of optogenetially modified human neural stem cells (hNSC) and electrochemical recording of the resulting release of the neurotransmitter dopamine. Finally, we have realized a first proof-of-concept exploring carbon nanograss electrodes for energy harvesting from cyanobacteria.

Biography
Prof. Stephan Sylvest Keller received his M.Sc. Degree in microengineering from the Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland, in 2005 and his Ph.D. in microtechnology from the Technical University of Denmark (DTU), Denmark, in 2008. Since 2015, he heads the Biomaterial Microsystems group at DTU Nanolab. His current research focuses on novel strategies for fabrication of 3D micro- and nanostructures in carbon and polymers for smart cell scaffolds, biosensors, drug delivery devices, microsupercapacitors and microbial fuel cells. In 2017, he received the prestigious Consolidator Grant from the European Research Council (ERC) to expand his activities in 3D carbon micro- and nanofabrication for electrochemical energy harvesting and storage.

Abstract
Soft bio-integrated electronics have attracted great attentions due to the advantages of soft, lightweight, ultrathin architecture, and stretchable/bendable, thus has the potential to apply in various areas, especially in the field of biomedical engineering. By engineering the classes of materials processing and devices integration, the mechanical properties of the flexible electronics can well match the soft biological tissues to enable measuring bio signals and monitoring human body health.
In this report, we will present materials, device structures, power delivery strategies and communication schemes as the basis for novel soft bio-integrated electronics. For instance, we will discuss a wireless, battery-free platform of electronic systems and haptic interfaces capable of softly laminating onto the skin to communicate information via spatio-temporally programmable patterns of localized mechanical vibrations. The resulting technology, which we refer as epidermal VR, creates many opportunities where the skin provides an electronically programmable communication and sensory input channel to the body, as demonstrated through example applications in social media/personal engagement, prosthetic control/feedback and gaming/entertainment. Other demonstrations will include a flexible bio piezoelectric microsystems for tissue pathology biopsies (cancer diagnosis), and skin like patches as sweat sensors for healthcare monitoring and energy harvesting.

Biography
Xinge Yu is currently an Associate Professor of Biomedical Engineering at City University of Hong Kong (CityU), Associate Director of the CAS-CityU Joint Lab on Robotics, and Assistant Director of Hong Kong Centre for Cerebro-cardiovascular Health Engineering. Dr Yu is the recipient of Innovators under 35 China (MIT Technology Review), NSFC Excellent Young Scientist Grant (Hong Kong & Macao), New Innovator of IEEE NanoMed, MINE Young Scientist Award, Gold Medal in the Inventions Geneva, CityU Outstanding Research Award etc. Dr Yu is also the Associate Editor of Microsystems & Nanoengineering, IEEE Open Journal of Nanotechnology, and Editor/Editoral Board of 12 journals.
Xinge Yu’s research group is focusing on skin-integrated electronics and systems for VR and biomedical applications. He has published 140 papers in Nature, Nature Materials, Nature Biomedical Engineering, Nature Machine Intelligence, Nature Communications, Science Advances etc..
Group website: https://yu-electronics.com/

Abstract
We have developed stimuli responsive polymer based soft wearable haptic interface technology. Here, we report study on electrically and photothermally-driven vibrotactile actuators. Electrically-driven tactile actuator is designed as multiple three-dimensional structures with dielectric elastomer protrusions lined up in parallel, produces large normal force feedbacks at localized area on a flexible surface responding to electrically-controllable deformation. Photothermally-driven one is constructed by adopting a thermal bimorph membrane structure of poly(3,4-ethlenedioxythiophene) doped with p-toluenesulfonate (PEDOT-Tos) coated onto PET(polyethylene terephthalate) film. Upon an irradiation of near-infrared (NIR) light, the light energy absorbed at the PEDOT-Tos layer is converted into thermoelastic bending deformation due to the mismatch in coefficient of thermal expansion between PEDOT-Tos and PET. The light-driven actuator can produce vibrotactile stimulation at arbitrary areas in the human-sensitive frequency range using a low input power as simultaneously allowing reversible, spatially-localized and rapidly-controllable deformation with designed light signals. Together with its simple and slim structure, the stimuli-driven actuation could contribute to opening up new ways to achieve substantial advances in rendering textures at a flexible touch interface. Keywords: (Stimuli-responsive polymer, actuator, vibrotactile, haptic interface)

Biography
Sungryul Yun received the Ph.D. degrees in Mechanical Engineering from Inha University, Korea, in 2009. He was a postdoctoral fellow in Materials Science and Engineering at University of California, Los Angeles, USA, in 2011. He is currently principal researcher and director of tangible interface research section at Electronics and Telecommunications Research Institute (ETRI), Korea. His research include stimuli-responsive polymers for flexible functional devices such as physical/chemical sensor, tactile sensor and actuator, artificial muscle and tunable lens.

Abstract
We live in a world increasingly surrounded by robots such as robotic surgical systems, flying drones, autonomous planetary rovers, and robotic appliances. An emerging family of robotic systems are untethered magnetic micro- and nanorobots. These tiny vehicles can move in fluid environments by means of external magnetic fields. One of the ultimate goals of magnetic small-scale robotics is to develop machines that can deliver drugs, or realize other medical missions in confined spaces of the human body. Other applications include water remediation or “on-the-fly” chemistry.
The recent rapid developments in magnetic small-scale robotics are undeniably related to advances in material science, manufacturing and magnetic navigation. However, while many applications have been demonstrated, aspects such as complex locomotion and navigation, multifunctionality, biocompatibility and biodegradability need to be further investigated for the successful application of these devices in clinical settings.
In this talk, we will present recent advances and challenges for the realization of biomedical magnetic small-scale robots. We will specially focus on aspects related to materials that are key for their translation to the operating theatre.

Biography
Prof. Dr. Salvador Pané i Vidal (Barcelona, 1980) is currently a Professor of Materials for Robotics at the Institute of Robotics and Intelligent Systems (IRIS) and co-director of the Multi-Scale Robotics Lab at ETH Zürich. He has authored or co-authored more than 150 articles in international peer-reviewed journals and books for education in science. Prof. Pané is currently working on bridging chemistry and electrochemistry with robotics at small scales. In the field of micro- and nanororobotics, his major focus has been the miniaturization of magnetic materials and conductive polymers and hydrogels for targeted drug delivery. At present, he teaches a course on nanorobotics and supervises several on-going PhD theses. Dr. Pané is/has been also the coordinator for a FET Open project (MANAQA), and a FET Proactive (ANGIE). In June 2013, Prof. Pané was awarded the highly competitive Starting Grant from the European Research Council (ERC). The grant provides 1.5 million euros over five years to investigate composite nanomaterials with magnetoelectric properties for chemical and biomedical applications. From 2015 to 2019, he was the Chair of the COST Action “e-MINDS: Electrochemical processing methodologies and corrosion protection for device and systems miniaturization” which brings together more than 40 European academic and industrial participants related to the areas of electrochemical manufacturing and corrosion science. Since 2016, he serves on the board of editors in the journal Applied Materials Today (Elsevier). In 2019, he was appointed associate editor in Frontiers in Bioengineering. He represents Switzerland in the European Academy of Surface Technology (EAST). He is also co-founders of the startup Magnes AG. In November 2017, he was awarded a Consolidator Grant (ERC). The Grant provides 2.0 million euros over five years to develop nanorobots that can be remotely instructed to produce electrical fields for biomedical applications. In 2019, Prof. Pané was honored with the Big-on-Small Award at the International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS). He has also received the ERC Proof-of-Concept grant (2019) to develop magnetoelectric reactors for water cleaning applications.

Abstract
In the field of small-scale robotics there is a growing interest on providing locomotion to soft materials, as these materials mimic more closely the physicochemical properties of biological tissues. Hydrogels, for example, can efficiently lead to biocompatible and biodegradable advanced small-scale robots that can find application in the biomedical field, e.g. in diagnostics and/or targeted drug delivery. However, even though hydrogels are an excellent platform to accomplish a new generation of functional small-scale robots, other materials that could allow highly integrated robotic platforms are yet highly demanded. In this context, metal-organic frameworks (MOFs), a class of soft material with high porosity and tunable physicochemical properties, could be a key component for developing future highly integrated small-scale robotic platforms. While some initial efforts have been made to produce mobile MOF-based small-scale machines, the locomotion features of most of these systems are not at the level of sophistication of current state-of-the-art micro- and nanoswimmers.
In this presentation, I will present our recent contributions to the field where three-dimensional MOF-based soft micromachines have been designed, fabricated and characterized. I will show how these structures can swim and follow complex trajectories by means of weak rotating magnetic fields. The proposed systems can achieve, for example, single cell targeting in a cell culture media and/or a controlled delivery of cargo payloads inside a complex microfluidic channel network. We believe that this new approach towards the fabrication of highly integrated multifunctional systems will undoubtedly open new avenues in soft robotics beyond current applications.

Biography
Prof. Dr. Josep Puigmartí-Luis is a chemist who completed a master in Chemistry and Food Engineering at “Institut Químic de Sarrià (IQS)” (2003) and did a PhD in materials science at Institut de Ciència de Materials de Barcelona (ICMAB). His work in supramolecular and flow chemistry, has been awarded with “Premi Antoni de Martí i Franquès de Ciències Químiques”, award from the Institut d’Estudis Catalans (2009), St. Jordi award from the Institut d’Estudis Catalans and the Societat Catalana de Química (2006) and an ETH fellowship in 2008.
In 2012, he was appointed a Ramon Y Cajal (RyC) researcher, but after two years as a RyC, he decided to move back to Switzerland where in 2015 was awarded an ERC starting grant to study and control self-assembly processes of metal-organic based crystalline materials.
In 2019, he was appointed as an ICREA Research Professor, and since 2020, his group is located at the University of Barcelona (UB).

Abstract
Engineering robots at the cellular scale could allow us to provide more targeted means for diagnostic and therapeutic interventions. Magnetic fields have proven to serve as safe strategy to wirelessly power microrobots for remote control in physiological environments. In this talk I will describe two types of living and synthetic magnetic microrobots for drug delivery and describe their respective design, fabrication, and control schemes using external magnetic fields. Furthermore, magnetic instrumentation for more selective control and possible integration of inductive feedback will be presented.

Biography
Simone Schuerle is an Assistant Professor at ETH Zurich, Switzerland, where she heads the Responsive Biomedical System Lab. With her team, she develops diagnostic and therapeutic systems at the nano-and microscale with the aim of tackling a range of challenging problems in medicine.  Prior to taking this position, she researched at MIT on nanosensors for in vivo tumor profiling as well methods to wirelessly enhance drug transport (2014-2017). She is recipient of several awards, such as the Prix Zonta in 2019 for Women in Science, and fellowships and grants from the SNSF, DAAD and Branco Weiss foundation, and was honored with the distinction of “Young Scientist” by the World Economic Forum (WEF) for her scientific contributions to society. In 2014 she co-founded the spin-off MagnebotiX that offers electromagnetic control systems for wireless micromanipulation. She earned her PhD degree with specialization in microrobotics in 2013 at ETHZ for which she was awarded the ETH medal, and a masters in industrial engineering with specialization on microsystems and nanotechnology at the Karlsruhe Institute of Technology in Germany.

Abstract
Soft robotic systems often present bio-mimicking designs that resemble actuation mechanisms of certain biological organisms, as for example in swimmers resembling fish or flagellated organisms. However, some unique properties from living organisms that are specially challenging to obtain in their artificial counterparts, such as self-healing, adaptability, or bio-sensing capabilities.[1] Several bio-hybrid robotics platforms across different scales had been developed,[2] but the ones based on living muscles has attracted increasing attention.[3] 3D printing technologies allowed the fabrication of advanced living robots based on skeletal muscle cells,[4] exploring also nanomaterials integration for enhanced force output.[5] The key feature when designing these new generation of robots using living components as an active materials will be discusses, as well as the main challenges and applications, both in the biomedical and the environmental field.

Biography
Dr. Maria Guix received her PhD in Chemistry, M.S. degree in Nanotechnology and B.Sc. degree in Chemistry from the Universitat Autònoma de Barcelona (UAB). During her PhD she worked in the Prof. Merkoçi’s group at Catalan Institute of Nanoscience and Nanotechnology (ICN2), working on the integration of nanomaterials in biosensing platforms. As a PhD candidate, she did two short internships related to the development of catalytic nanomotors, first in EMPA (Switzerland) and then in the University of California San Diego (USA) under the supervision of Prof. Joseph Wang. She later joined Prof. Oliver Schmidt’s group as a postdoctoral researcher at IFW Dresden, developing biocompatible micromotors for biomedical applications. Afterwards, she moved to Purdue University to work on the automation of magnetic microrobots for safe manipulation tasks by using visual-based control methods. She was a postdoctoral researcher at the Institute for Bioengineering of Catalonia (IBEC) for 4 years under the supervision of Prof. Samuel Sánchez’ group, focusing her research line in the development of advanced functional living robots. She just joined in a tenure track position the University of Barcelona, at Prof. Josep Puigmartí group.

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Having interesting physical and chemical properties, gallium-based liquid metal (LM) has been widely used in micro-nano patterning, reconfigurable devices, thermal management and so on. Precise LM interface manipulation is the fundamental technique LM devices. Here we presented a liquid metal based reconfigurable microfluidic chip to achieve precise LM interface manipulation, which enabled consistent, continuous and large liquid metal unit structure array reconfiguration. The chips were assembled into a metasurface, which preliminary achieved controllable electromagnetic wave reflection attenuation. The chip contained an array-shaped Galinstan split-ring resonator (SRR) array, and the SRRs could be reconfigured continuously by the NaOH solution pressure driven. The SRRs enabled more than 250° reconfiguration and showed consistent deformation with a standard derivation less than 8.5°. The metasurface showed 7.5 dB and 13.5 dB attenuation at 3 GHz and 4 GHz respectively. Also, with the different split angles, there could be three attenuation peaks that reach -10 dB when the frequency ranged from 2.9-3.1 GHz, 3.7-4.2 GHz and 4.8-5.0 GHz, respectively. The LM based metasurface we proposed can be potentially used in multiband controllable electromagnetic wave tuning.

Biography
Prof. Wei Wang is the deputy dean of School of Integrated Circuits, Peking University and the director of the National Key Laboratory of Science and Technology on Micro/ Nano Fabrication. He received his B.S. in Thermal engineering from University of Shanghai for Science and Technology (USST, 1999) and the Ph.D. in Thermal Engineering from Tsinghua University (2005). He was a Visiting Professor in UC Davis (with Prof. Tingrui Pan) from 2007-2008 and Caltech (with Prof. YC Tai) from 2014-2015. His research focus is Parylene MEMS, clinical micro/nanosystem, and thermal management of 3D microsystem. He has published over 100 peer-reviewed articles, over 50 presentations with over 15 invited presentations, and 15 patents pending or granted. He is the Associated Editor of Microfluidics and Nanofluidics, Microsystems & Nanoengineering, and has served/ is serving on organizing committees for several international conferences, including IEEE MEMS’2015 and ‘2016, Transducers’2019, and 2021 etc.

Abstract
The term ‘haptic’ is a word that is related to kinesthetic or tactile sensation. Kinesthetic and tactile information refers to sensory data obtained through receptors of joints, muscles, ligaments, and etc, and through receptors of skin, respectively. A user recognizes the stiffness of an object through the kinesthetic information and discerns the texture of an object through the tactile information. Therefore, a user can communicate and/or interact with a device efficiently by adding haptic information to auditory and visual information. Devices are under rapid shift from rigid to flexible and soft modules. Researchers are developing even shape changing interfaces, which can provide better affordance to users. Since such interface and module can have diverse shapes, the currently available rigid actuators/sensors are not very appropriate to provide/sense tactile feedback, and we will need the tactile actuators/sensors that have excellent shape conformity. Soft actuators/sensors are one of the best candidates for that purpose. This talk addresses the best-established technologies for soft haptic actuators and sensors.

Biography
Sang-youn Kim received the B.S. degree from Korea University, South Korea, in 1994, and the M.S.E. and Ph.D. degrees from the Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, in 1996 and 2004, respectively. From 2004 to 2005, he was a Researcher in the Human Welfare Robot System Research Center. In 2005, he was a Research Staff at the Samsung Advanced Institute of Technology. He is currently a Professor of Computer Science and Engineering department at the Korea University of Technology and Education. His current research interests are human–computer interaction, virtual reality, and haptics.

Abstract
Biophysiology detection from current advanced electronics is limited by external signal artifacts (e.g. walking and respiration). Here, we present the viscoelastic gelatin/chitosan hydrogel damper inspired by the viscoelastic cuticular pad in a spider to remove dynamic mechanical noise artifacts selectively under 30 Hz.[1] The hydrogel exhibits frequency-dependent phase transition that results in a rubbery state that damps low-frequency noise and a glassy state that transmits the desired high-frequency signals. Instead of the conventional signal processing, the hydrogel damper served as unconventional pass filter that is able to be integrated with advanced bioelectronics and nanoscale crack based sensor [2] for biophysiology detection even in noisy conditions. It can dissolve chronic noise problems in the bioelectronics, and shows huge potential for uninterrupted monitoring of devices (i.e., gadgets, medical devices, or prostheses) for patients.

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Reconfigurable logic (RL) has attracted researchers’ attention thanks to its design flexibility and development time reduction. Its most well-known example is a field-programmable gate array (FPGA). The connection blocks (CBs) connect adjacent logic blocks (LBs) with each other and consist of many one-to-n or n-to-one multiplexers (MUXes). The switch boxes (SBs) connect the CBs which surround them and consist of many n-to-n MUXes. Using the CBs and SBs, the flexible data signal paths between each LB is implemented. Conventional CMOS-only RL circuits have some limitations such as low speed, high energy consumption and large chip area, because they use MOSFETs in CBs and SBs. In order to address these problems, CMOS-NEM hybrid RL circuits are proposed which replace MOSFETs in the CBs and SBs with NEM memory switches. Their advantages are confirmed based on simulation and measurement results.

Biography
Woo Young Choi received the B.S., M.S., and Ph.D. degrees from the School of Electrical Engineering, Seoul National University, Seoul, South Korea, in 2000, 2002, and 2006, respectively. From 2006 to 2008, he held a postdoctoral position with the Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, CA, USA. From 2008 to 2022, he was a professor at the Department of Electronic Engineering, Sogang University, Seoul. Since 2022, he has been a Faculty Member with Seoul National University, Seoul, where he is currently an Associate Professor with the Department of Electrical and Computer Engineering. He has authored or coauthored more than 300 articles in international journals and conference proceedings. He holds more than 55 Korean/U.S. patents. His current research interests include fabrication, modeling, characterization, and measurement of CMOS logic/analog devices, emerging devices, memory devices, and brain–inspired computing devices.

Abstract
Deep learning based artificial intelligence is the hottest topic in recent years without a doubt. The recent deep learning algorithms have huge size deep neural networks (DNNs) and the number of computations are enormous to achieve higher accuracy. So, von-Neumann architectures inevitably suffer from the energy consumption issue due to the huge number of data movements between the memory and the processor. To solve these problems, compute-in-memory (CIM) technology has been proposed to minimize the data movement to off-chip memory. In CIM technology, multiply-and-accumulation (MAC) operations which takes dominant part of the DNN computations are implemented within the memory array in analog manner by accumulating the current from the multiple cells at the same time. In this work, the motivations and the principles of the CIM technology will be introduced. And various nonvolatile memory (NVM) based CIM technologies will be introduced such as resistive random access memory (RRAM), phase change memory (PCM), and ferroelectric device.
Moreover, 3D NAND Flash based CIM architectures and the operation methods for MAC operations will be introduced. 3D NAND Flash shows low on-state current which is suitable for the CIM applications. Exploiting the large number of bitlines (BLs) in 3D NAND array, the inference accuracy can be enhanced with optimized weight mapping strategy [1]. Also, ultra-high density of 3D NAND structure can be exploited to store the huge size neural network, e.g. recurrent neural network (RNN) and transformer model. To increase the 3D NAND density and the array efficiency further, heterogeneous integration with CMOS die using hybrid bonding technique was introduced [2]. In this architecture, the low voltage transistor based circuits such as analog-to- digital converter and digital logic circuits are fabricated on the CMOS die. Meanwhile, the 3D NAND cells and high voltage transistors to drive the wordlines (WLs) of the 3D NAND cells are fabricated on the NAND die. Top metal layers from both of the wafers are attached by hybrid bonding, enabling high bandwidth of signal transfer in between. Ferroelectric FET can replace the charge trap flash (CTF) cell owing to its similar structure and operation mechanism. Much faster switching time and lower write voltage implemented by FeFET enables on-chip training with 3D NAND architecture [3].

Biography
Wonbo Shim received the B.S. and Ph.D. degrees in electrical engineering from the Seoul National University, Korea in 2007 and 2013, respectively. He is currently an assistant professor of Department of Electrical and Information Engineering with Seoul National University of Science and Technology. From 2013 to 2019, he was a Senior Engineer with the Samsung Electronics, Hwaseong, Korea, in flash design team at memory division. From 2019 to 2021, he was a Postdoctoral Research Fellow in Georgia Institute of Technology. His current research interest includes energy efficient deep learning architecture design, nonvolatile memory device modeling for synaptic applications, and 3D NAND Flash design.

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Despite well-developed electronic properties and record-breaking device efficiencies, the excessive materials cost of III-V compound semiconductors for growing epitaxial layers on an expensive growth wafer has hampered their practical application as terrestrial photovoltaics. To mitigate their cost issue, transfer-printing technology that enables re-using growth wafers and scale-up assembly into large-area modules has been proposed. While wafer costs can be alleviated through this manufacturing technology, process costs and power generation capability remain barriers to lowering the levelized cost of electricity. Here, we present our recent studies for defect-free transfer-printing assembly techniques and nanophotonic materials integrations for cost-competitive, high-performance III-V multi-junction solar cells. Large-area flexible photovoltaic modules with optimally arranged III-V solar cells embedded in luminescent and scattering waveguides exhibit considerably enhanced power generation performance without compromising cost increase. The materials platform, device architecture, and fabrication strategy studied here represent substantial progress toward high-performance III-V multi-junction photovoltaic devices.

Biography
Dr. Sung-Min Lee is currently an Associate Professor in the School of Materials Science and Engineering at Kookmin University in South Korea. He received a B.S. degree from Seoul National University, South Korea, in 2006 and M.S./Ph.D. degrees from Korea Advanced Institute of Science and Technology, South Korea, in 2008/2012, respectively, all in Electrical Engineering. Prior to joining Kookmin University, he was a Postdoctoral Research Associate at University of Southern California from 2013 to 2015 and a Research Staff Member at Samsung Advanced Institute of Technology from 2015 to 2016. His research interests have been on emerging optoelectronic devices and systems with unusual functions and enhanced performance. He has given several invited talks and lectures at conferences and seminars, and authored over 40 peer-reviewed journal articles (H-index = 22). Since 2021, he has served as an Asian Program Committee Member of Society for Information Display (SID) and Technical Program Committee Session Chair of Global Photovoltaic Conference (GPVC).

Abstract
Energy-absorbing materials are used in many daily and advanced applications. However, current energy-absorbing materials tend to have limited uses and energy absorption capability. It would be desirable to develop a reusable energy-absorbing material that exhibits increased energy absorption over a wide range of strain rates for enhanced vibration and impact protection performance. To achieve this objective, we hypothesized that the energy absorption capability can be augmented by incorporating a rate-dependent multiscale dissipation mechanism to architected materials (or metamaterials). We harnessed energy dissipation mechanisms across different length scales by utilizing architected liquid crystalline elastomers that consist of nanoscale polymer networks, microscale mesogens, and macroscale energy trapping structures. As a result, our reusable energy-absorbing materials showed about an order of magnitude higher energy absorption density at quasi-static condition compared with the previous studies and over two orders of magnitudes higher energy absorption density at impact speed range, with power-law relation, whose exponent can be tuned. We also found that we could further enhance the energy absorption density by vertical stacking from the synergy of nonlinear behaviors of materials and structures. The findings from our study can be beneficial for various applications, including aerospace, automotive, and personal protection.

Biography
Sung Hoon Kang is an Assistant Professor in the Department of Mechanical Engineering at Johns Hopkins University. He earned a Ph.D. degree in Applied Physics at Harvard University and M.S. and B.S. degrees in Materials Science and Engineering from MIT and Seoul National University, respectively. Sung Hoon has been investigating solutions to address current challenges in engineering materials, structures and devices with applications including resiliency, sensing, energy, and healthcare. Throughout his career, he has co-authored 59 papers, has given >180 presentations (including >110 invited talks), and has six patents and five pending patents. His honors include Invitee for First U.S.-Africa Frontiers of Science, Engineering, and Medicine Symposium, 2022 Hanwha Non-Tenured Faculty Award, 2021, 2020 Air Force Summer Faculty Fellowship, 2020 Johns Hopkins University Catalyst Award, 2019 Johns Hopkins University Whiting School of Engineering Research Lab Excellence Award, Invitee for 2019 China-America Frontiers of Engineering Symposium, FY 2018 Air Force Office of Scientific Research Young Investigator Program Award, and Invitee for 2016 National Academy of Engineering US Frontiers of Engineering Symposium. He served as the Chair, Vice Chair, Secretary, and Editor of ASME Technical Committee on Mechanics of Soft Materials.

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In this work, machine learning prediction models of nanoindentation hardness of alloy thin films have been developed. The combinatorial synthesis of the alloys though magnetron co- sputtering, followed by nanoindentation mapping was used to efficiently acquire hundreds of composition-dependent hardness data of pure metals as well as binary and ternary alloys. An iterative process of 1. Combinatorial nanoindentation hardness measurements, 2. Training machine learning models with new data, 3. Synthesis of new alloys has been employed to enhance the performance of the prediction models. We found that utilization of easily-accessible composition-dependent features (e.g. heat of mixing and average electronegativity, etc.) can lead to construction of reliable regression models of the hardness. We demonstrate that novel alloy films with high-specific hardness can be developed using the data-driven approach.

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The role of graphene interfaces in strengthening and toughening of the Cu-graphene nanolayered composite was investigated using in-situ transmission electron microscopy (TEM) tensile deformation and molecular dynamics (MD) simulations. In-situ TEM tensile testing showed that the dislocation plasticity is strongly confined within single Cu grains by the graphene interfaces and grain boundaries. The weak Cu-graphene interfacial bonding induced stress decoupling, which resulted in independent plastic deformation of each Cu layer. MD simulations confirmed that the localized deformation occurs independently in each Cu layers, where the graphene interfaces effectively block crack propagation as delamination occurs at the Cu-graphene interfaces to allow for elastic strain energy dissipation.

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Quantitative characterization of mechanical properties of many nano- or micro-scaled materials is of crucial importance for many technological applications. Among various experimental methods, the in-situ nanomechanical tensile testing is of particular significance due to its capability of direct observation of mechanical behavior. Especially, the tensile loading mode enabling the precise displacement control is desirable for brittle nanomaterials that often suffer from the catastrophic failure by mechanical instability. In this study, we developed the MEMS-based nanomechanical tensile device optimized for stable displacement control even in the presence of the rapid reduction of sample stiffness. The MEMS device is designed to stabilize the motion of the actuating rod in the testing equipment via the high stiffness of springs and the large mass of the movable part. To verify the performance of the device, we conducted tensile testing on the pre-notched metallic glass samples and successfully observed fast load drops during crack propagation.

Biography
Dongchan Jang received the Ph.D. and B.S. degrees in Materials Science and Engineering from the University of Michigan – Ann Arbor and Seoul National University, respectively. From 2008 to 2013, he worked as a postdoc in the Department of Applied Physics and Materials Science at California Institute of Technology. He joined the Department of Nuclear and Quantum Engineering at Korea Advanced Institute of Science and Technology (KAIST) in 2013 as an assistant professor and promoted to associated professor in 2018. His research interests include nanomechanics, focused on understanding mechanical behavior at the nanoscale, and its application for structural and functional materials.

Abstract
Materials displaying negative Poisson’s ratio, referred to as auxeticity, have been found in nature and created in engineering through various structural mechanisms. However, uniting auxeticity with high strength and high stiffness has been challenging. Here, combining in-situ nanomechanical testing with microstructure- based modeling, we show that the leading part of limpet teeth successfully achieves this combination of properties through a unique microstructure consisting of an amorphous hydrated silica matrix embedded with bundles of single crystal iron oxide hydroxide nanorods arranged in a pseudo-cholesteric pattern [1]. During deformation, this microstructure allows local coordinated displacement and rotation of the nanorods, enabling auxetic behavior while maintaining one of the highest strengths among natural materials. These findings lay a foundation for designing biomimetic auxetic materials with extreme strength and high stiffness.

Biography
Prof. Inkyu Park received his B.S., M.S., and Ph.D. from KAIST (1998), UIUC (2003) and UC Berkeley (2007), respectively, all in mechanical engineering. He has been with the department of mechanical engineering at KAIST since 2009 as a faculty and is currently a full professor, vice department head, and KAIST Endowed Chair Professor. His research interests are nanofabrication, smart sensors for healthcare, environmental and biomedical monitoring, nanomaterial-based sensors and flexible & wearable electronics. He has published more than 150 international journal articles (SCI indexed) and 200 international conference proceeding papers, and holds more than 40 registered domestic and international patents in the area of MEMS/NANO engineering. He is a recipient of IEEE NANO Best Paper Award (2010), HP Open Innovation Research Award (2009-2012), KAIST Prize for Academic Excellence (2021), KAIST Grand Prize for Technology Innovation Award (2019), KAIST Endowed Chair Professorship (2017), and Outstanding Researcher Award from the Micro and Nano Systems Society of Korea (2020, 2022). As of Dec 2022, his total citation is more than 12,250 and h-index is 49.

Abstract
Chemical mechanical polishing (CMP) is a widely accepted technology for integrated circuit manufacturing in semiconductor industry, due to its high-precision capability in both local and global planarization. In CMP, polyurethane pads provide necessary forces for mechanical abrasion with the involvement of nanometer sized particles. Therefore, pads with well-defined geometrical and precisely controlled mechanical properties in nanoscale can greatly improve the process performance and quality. In this talk, I introduce structured polyurethane pads with tailored mechanical properties which can maximize the productivity in CMP process. Scalable microfabrication techniques and advanced additive manufacturing methods enable the realization of new conceptual surface structures, while classical contact mechanics theories elucidate the benefits of microstructured surface by altering the nanoscale hardness according to the indentation depth.

Biography
Sanha Kim is an associate professor in the Department of Mechanical Engineering at the Korea Advanced Institute of Science and Technology (KAIST). He earned his Bachelor’s and Master’s degrees in Mechanical Engineering from Seoul National University, and obtained his PhD degree in Mechanical Engineering from Massachusetts Institute of Technology (MIT). He also worked as a Postdoctoral Associate and a Research Scientist in the Department of Mechanical Engineering and Laboratory for Manufacturing and Productivity at MIT. His focus areas include advanced manufacturing, surface engineering, chemical-mechanical polishing, carbon nanomaterials synthesis, 2D and 3D printing technologies, and digital manipulation of micro and nano materials.

Abstract
Superhard boron carbide (BC) comprising light elements of boron and carbon only. Knowledge of the exact atomic structure and underlying deformation mechanism of BC is of utmost importance in understanding and tailoring the material properties. In this talk, atomic imaging of BC will be demonstrated using annular bright field scanning transmission electron microscopy (ABF-STEM) technique. The observations upon deformation of BC provide the evidence of nanosized amorphous bands via shear amorphization. The loading discontinuity i.e., pop-in, in nanoindentation load-displacement measurements reveals exceptionally small activation volume, slow nucleation rate, and low activation energy of the shear amorphization, suggesting that the high-pressure structural transition is activated and initiated by defects such as dislocation nucleation. To reduce the brittleness, nanocrystalline BC (n-BC) with a homogenous distribution of nano-sized pores and amorphous carbon at grain boundaries (GBs) were synthesized at relatively low temperatures. Transmission electron microscopy (TEM) of n-BC reveals that the unusual nanosize effect arises from the deformation reduced elimination of nano-porosity mediated by grain boundary sliding with the assistance of the soft GB phase. Further, our recent observations combined with computer simulations reveals GB sliding leads to the amorphous band formation at pre-distorted icosahedral GB regions with initiation of cavitation within the amorphous bands. These promising results and fundamental understanding have important implications in designing new boron carbide materials for hard-facing applications with improved mechanical properties by reinforcing chemical doping or changing the ratio of these light elements at atomic level.

Biography
Dr. Kolan Madhav Reddy is currently an Associate Professor in School of Materials Science and Engineering at Shanghai Jiao Tong University, China. His research is concerned with identifying the atomic structures using transmission electron microscopy that governs the macroscopic mechanical response of advanced materials. He received his PhD in Materials Science at Tohoku University, Japan and Postdoctoral research at Johns Hopkins University, USA. He is a recipient of Dr. R. L. Thakur Memorial Award (Young Scientist) in recognition of outstanding contribution of outstanding contribution in the field of Materials Science honored by Indian Ceramic Society in 2017.

Abstract
With the increasing use of modern electric power systems in uniquely challenging situations, excellent electrical properties of conductors with environmental stability are becoming increasingly relevant. In this regard, we have recently developed a bi-continuous graphene-copper composite, called an axially continuous graphene–copper (ACGC) wire, with significantly enhanced electrical properties compared to other conductors. For example, ACGC offers the highest electrical conductivity among the reported graphene-metal composite and metal conductors. To reveal the underlying mechanism(s) of the enhancements, we have characterized the electrical properties of as-received and annealed copper wires, and ACGC wires with 10, 25, and 80-µm diameters, respectively. Our experimental investigations combined with theoretical analysis have revealed that application of a large current density (450% increase) through the ACGC wires becomes possibles because the continuous graphene layers considerably improve (1) surface heat dissipation (224% increase), (2) electrical conductivity (41% increase), and (3) thermal stability (41.2% lower resistivity after thermal cycles up to 450 oC) compared to pure copper wires. Our promising results and fundamental understanding of the underlying mechanisms may bring technical paradigm shift in designing high-performance, axially bi-continuous graphene-metal composites for high power transmission applications in aerospace, advanced electronics, electric vehicles, and power transportation systems.

Biography
Dr. Wonmo Kang received his Ph.D. degree from the University of Illinois at Urbana-Champaign and moved to Northwestern University in 2012 as a postdoctoral researcher. In 2014, Dr. Kang won the American Society for Engineering Education-Naval Research Laboratory Fellowship and then became a research scientist at the US Naval Research Laboratory. Currently, Dr. Kang is an assistant professor in the School for Engineering of Matter, Transport and Energy at Arizona State University.

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A blood-based diagnostic test for myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and multiple sclerosis (MS) would be of great value in both conditions, facilitating more accurate and earlier diagnosis, helping with current treatment delivery, and supporting the development of new therapeutics. Here we use Raman micro-spectroscopy to examine differences between the spectral profiles of blood cells of ME/CFS, MS and healthy controls. We were able to discriminate the three groups using ensemble classification models with high levels of accuracy (91%) with the additional ability to distinguish mild, moderate, and severe ME/CFS patients from each other (84%). To our knowledge, this is the first research using Raman micro-spectroscopy to discriminate specific subgroups of ME/CFS patients on the basis of their symptom severity. Specific Raman peaks linked with the different disease types with the potential in further investigations to provide insights into biological changes associated with the different conditions.

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Self-assembly of nanoparticles (NPs) is a powerful route to constructing higher-order structures. However, the programmed self-assembly of NPs into non-close-packed, 3D, shape-morphing nanocilia arrays remains elusive, whereas dynamically actuated nanometer cilia are universal in living systems. Here, a programmable self-assembly strategy is presented that can direct magnetic NPs into a highly ordered responsive artificial nanocilia actuator with exquisite nanometer 3D structural arrangements. The self-assembled artificial NP cilia can maintain their structural integrity through the interplay of interparticle interactions. Interestingly, the nanocilia can exhibit a field-responsive actuation motion through “rolling and sliding” between assembled NPs rather than bending the entire ciliary beam. It is demonstrated that oleic acid coated over the NPs acts as a lubricating bearing and enables the rolling/sliding-based actuation of the cilia.

Biography
Prof. Hoon E. Jeong obtained his Ph.D. degree from the School of Mechanical and Aerospace Engineering at Seoul National University in 2009 and moved to the University of California, Berkeley for postdoctoral research with Prof. Peidong Yang. He began his independent career in 2012 as assistant professor in the School of Mechanical, Aerospace and Nuclear Engineering at Ulsan National Institute of Science and Technology (UNIST). He is currently a full professor in the Department of Mechanical Engineering at UNIST. He has published more than 100 international journal articles and holds more than 60 registered or filed domestic and international patents in the area of micro/nano engineering and flexible devices. His current research interests include bioinspired materials, stimuli-responsive materials, soft matter and robotics, flexible and wearable devices. As of Jan 2023, his total citation is more than 6,400 and h-index is 45.

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Surface-enhanced Raman spectroscopy (SERS) has shown great potentials in the field of life science due to its high specificity and sensitivity. Gap-enhanced Raman tags (GERTs) are a new type of SERS nanoprobes recently emerged for analytical, bioimaging and theranostic applications. Because of embedding (orthogonal) Raman reporters in interior nanogaps and off-resonant excitation, GERTs isolate the interference from unwanted external environments and particle aggregation, show strongly enhanced electromagnetic fields in the gaps of core–shell structures, and demonstrate minimized photodamage to biological samples and ultrahigh photostability. In this talk, we will share the synthesis, optical properties (e.g., single-nanoparticle sensitivity), and enhancement mechanism of GERTs and their application for sentinel lymph node (SLN) identification. We have demonstrated that GERTs are greatly favorable for high-contrast and deep SLN Raman imaging in a high-speed imaging mode, and meanwhile reveals the migration behavior of the probes in mouses, rabbits and non-human primates. Moreover, SLN detection could be realized via a cost-effective commercial portable Raman scanner. Comprehensive evaluations in biotoxicity of GERTs are carried out, indicating that GERTs hold the great potential to be translated in clinical application for accurate and intraoperative location of the SLN.

Biography
Jian Ye received his B.E. and M.S. degree from Zhejiang University (China) and Ph.D. degree from KU Leuven (Belgium). He joined Shanghai Jiao Tong University (SJTU) in 2013 and was promoted as a full professor in 2017. Dr. Ye has received a number of awards including Outstanding Youth Fund from Chinese National Natural Science Foundation (2016) and Journal of Materials Chemistry B 2020 Emerging Investigators. His research interests focus on biomedical applications of plasmonic nanostructures and surface-enhanced Raman spectroscopy. He has published 2 book chapters and 100 papers including Nature Communications, Advanced Science, Nano Letters and ACS Nano.

Abstract
To understand the mechanism underlying the function and dynamics of the nervous system or to treat neurological disorders, it is essential to develop the techniques capable of modulating and recording a diversity of signals employed by neurons. However, current approaches are limited in terms of effectiveness, side effects, non-specificity, and mechanical invasiveness. Naturally, there is a huge need for new devices or materials allowing for minimally invasive manipulation with monitoring of neural activity. My talk will introduce various complementary strategies to address these challenges: (1) Flexible and stretchable fiber-based probes for interfacing with the brain and spinal cord; (2) Biocompatible fiber scaffold to help the regeneration of neural tissue; (3) Wireless nanoparticle-based techniques for deep brain stimulation. These technologies enabling the interrogation with neural circuits across their diverse signaling modalities without inducing a foreign-body reaction helps the study of information processing as well as pathologies of the nervous system.

Biography
Dr. Seongjun Park is an assistant professor of the Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology (KAIST). He received his bachelor’s degree in Mechanical and Aerospace Engineering from Seoul National University (SNU) in 2013, master’s degree in Mechanical Engineering from Massachusetts Institute of Technology (MIT) in 2015, and doctoral degree in Electrical Engineering and Computer Science from MIT in 2018. He completed his postdoctoral training in Materials Science and Engineering MIT in 2019. His research interests include the development of multifunctional fiber or nanomaterials-based biomedical and neural interfaces, and he published many related papers in prestigious journals such as Nature Electronics, Nature Neuroscience, Nature Communications, Science Advances, and Advanced Materials. He is a recipient of MRS Gold Award, Regeneron Prize, and Helen Carr Peake Research Prize.

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Various types of testing models such as plastic dish-cultured cells, small animals, and large animals have been extensively utilized as an alternative model for humans in drug development. However, cell culture models lose the physiological relevancy and the animal models show inherent genetic heterogeneity with humans. For these reasons, the efficacy of drug candidates was occasionally exaggerated or their toxicity was underestimated. In this regard, bioengineers have developed human-brain-mimetic testing models. In this presentation, the human-brain- mimetic organ-on-a-chip model, human brain avatars, is presented. The human brain avatar models not only can mimic the cellular composition and functional aspect of the human brain but also reconstitute the microenvironment of brain tissue such as flow, mechanical properties, and molecular transport. By using the brain-on-a-chip model, various human-specific brain diseases can be modeled such as Alzheimer’s disease, air pollution-mediated brain degeneration, and brain tumor. It is envisioned that the human brain avatar models can address the unmet needs of human-brain-specific testing platforms and thus help the drug development process.

Biography
Dr. Kim is currently with the Brain Science Institute at KIST. He received his B.S. (2008), M.S. (2010), and Ph.D. (2014) from the School of Mechanical and Aerospace Engineering, Seoul National University, respectively. He spent 1.5 year as a post-doc in Brain Science Institute, KIST. Then he became a Senior Researcher at the same institution in 2016. His research topic covers the development of the brain-on-a-chip platforms and their applications in the modeling of human brain diseases such as Alzheimer’s disease, diabetic brain, air pollution- mediated neurodegeneration. He also authored 85 publications, including journals such as Advanced Functional Materials, Science Advances, ACS Nano, Nano Today, and Biomaterials.

Abstract
A brain organoid is a self-organizing 3D tissue derived from human embryonic stem cells or pluripotent stem cells with a cellular composition and structural organization representative of the developing human brain. In recent years, organoids have become an excellent model for investigating brain development and neurological diseases. We propose an engineered biological construct that can mimic natural environment more closely to create organoids and spheroids. Using a microfluidic chip format, we built a miniaturized multiplexed platform to generate brain organoids and spheroids with minimal intervention. With the help of this integrated detection platform, we can grow brain organoids and study neurogenesis in a highly multiplexed way under various physiological conditions. The in vitro brain organoid models can provide the unique opportunity to obtain information about early brain development and elucidate the mechanisms of neurologic disorders. We foresee that this integrated microfluidic high-throughput organoid on-a-chip platform could become a next-generation platform in the study of neurogenesis and in screening of novel drug candidates to treat various neurodegenerative diseases such as ASD, Alzheimer’s, Parkinson’s and Depression in future.

Biography
Yong-Ak (Rafael) Song received MEng degree in Mechanical Engineering from the RWTH Aachen University of Technology in 1993, and Ph.D. degree from the School of Mechanical Engineering, RWTH Aachen University in 1996. He was a senior research scientist at Korea Institute of Science and Technology (KIST) until 2001. He moved to Boston and worked at MIT until 2012. He is currently an associate professor in the Division of Engineering, New York University in Abu Dhabi (NYUAD) and holds a joint appointment in the Department of Chemical and Biomolecular Engineering, as well as in the Department Biomedical Engineering, Tandon School of Engineering at New York University in Brooklyn, NY. He is also the program head of the Bioengineering Program at NYUAD. His main research interests are on various aspects of micro- and nanoscale bioengineering including biosensors, optofluidics, point-of-care diagnostics, and biomimetics.

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MXenes are an emerging class of 2D materials with unique properties which ensure their utility for diverse applications. However, the synthesis of MXenes with controlled lattice structure and atomic stoichiometry in a low- cost process is still challenging. In this study, we claim a novel cost-effective method to synthesize a highly crystalline and stoichiometric Ti3C2Tx MXene with minimum substitutional oxygen impurities by controlling amount of excess carbon and time of high-energy milling in carbothermal reduction of recycled TiO2 source. The TiC powder synthesized with the highest excess carbon content of 2 wt.% after 20 h of high- energy ball milling shows the highest carbon and minimum substitutional oxygen content among the specimens, indicating complete oxide-to-carbide conversion without any significant presence of non-stoichiometric oxy-carbides. High carbon and low substitutional oxygen content in the Ti(CxO1-x) lead to the synthesis of Ti3Al(CxO1-x)2 phase with minimum substitutional oxygen, which subsequently produce a highly conductive Ti3C2Tx MXene (11738 S/cm) with excellent EMI-shielding properties. Our results suggest that the conductive MXenes with improved crystal structure and atomic stoichiometry can be synthesized from inexpensive TiO2-based precursors, without using excess of expensive aluminum and/or titanium metal, which collectively reduces the material cost by ~66%.

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Recent developments in the field of two-dimensional (2D) materials have sparked significant interest in the application of layered materials in electronics, including switching devices and various types of sensors. Additionally, it has been demonstrated that incorporating a ferroelectric layer in field-effect transistors (FETs) can enhance their performance beyond the classical limit, resulting in the realization of low-power negative capacitance FETs (NCFETs). This talk will highlight how these novel materials can be utilized to tap into the potential of nanomaterials in the development of future electronic devices. During this presentation, we will delve into three key topics: (a) modeling of nanomaterials, (b) comprehension of the physics behind innovative electronic devices, and (c) engineering strategies for material selection and device design. Our discussion will encompass a range of 2D materials, including HfS2, PtSe2, MoS2, and MoSe2, and explore how their electronic bands can be altered through various material modification techniques, such as strain engineering [1], nanopatterning [2], or the introduction of impurities [3], with a focus on optimizing them for specific applications. Furthermore, we will introduce a cutting-edge computational framework for NCFET simulations and examine the performance engineering along with trade-offs [4]. Finally, we will demonstrate how the established theories can be extended to other types of devices, such as phototransistors[5], and highlight the benefits of collaboration between experimental and theoretical approaches[2, 3].

Biography
Dr. Youngki Yoon is an Associate Professor in the Department of Electrical and Computer Engineering at the University of Waterloo in Waterloo, Ontario, Canada. He obtained his B.E. degree in Metallurgical Engineering from Korea University in Seoul, Korea in 1999, followed by his M.S. and Ph.D. degrees in Electrical and Computer Engineering from the University of Florida in Gainesville, FL, USA in 2005 and 2008, respectively. After his time at the University of Florida, he went on to work as a Postdoctoral Researcher at the University of California, Berkeley from 2009 to 2013. At the University of Waterloo, Dr. Yoon served as the Director of the Nanotechnology Engineering undergraduate program from 2018 to 2020. His area of research focuses on the modeling and simulation of emerging and exploratory devices. He has made significant contributions to the field, having published 90 journal papers and conference articles that have been cited over 6400 times, resulting in an h-index of 27. In recognition of his contributions, Dr. Yoon has received several prestigious awards, including the Early Researcher Award and the WIN Research Leader Award. He has also served on the Institute of Electrical and Electronics Engineers (IEEE) Electron Devices Society (EDS) Technical Committee in Nanotechnology and has acted as a guest editor for several special issues of both the IEEE Transactions on Electron Devices and Materials Today Electronics.

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When a patient falls into a coma, the doctor must determine the patient's coma level by administering pain stimulation and observing the feedback of myodynamia in order to choose an appropriate treatment plan. However, the muscle action amplitude produced by myodynamia from level-0 to level-1 is very small, making it difficult for doctors to judge with the naked eyes, potentially jeopardizing the treatment plan. To address this issue, we have designed a ultra-sensitive, durable and biocompatible ionic skin (i-Skin) inspired by the ion signal transmission mechanism of muscles. This i-Skin is composed of polyurethane as the elastic matrix and ionic liquid as the signal transmission medium. Specifically, the donor-acceptor structure with reversible self-assembly property was introduced into the main chain of polyurethane, providing it with toughness and self-healing property similar to muscle, which helps to improve the durability of i-Skin. Simultaneously, we adjusted the hard/soft segment ratio to make its modulus infinitely close to that of muscles. Furthermore, the donor-acceptor structure and ionic liquid have a reversible "trap-release" effect. Mechanical stimulation can disrupt this effect, which effectively increase the difference between the immediate capacitance and the initial capacitance, maximizing tactile perception. By attaching this i-Skin to comatose patients' knuckles, it can efficiently identify the muscle action amplitude generated by myodynamia from level-0 to level-1, allowing doctors to accurately judge the degree of coma and formulate a reasonable treatment plan.

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Dr. Wu Bin Ying is now an associate professor at the Chinese Academy of Sciences, Ningbo Institute of Materials Technology and Engineering. From 2012 to 2017, he earned his PhD at Chungnam National University in Korea, and from 2017 to 2019, he worked as a postdoctoral researcher at the Chinese Academy of Sciences, and was honored with the title of "excellent postdoctoral" talent. He was an assistant professor in 2020 and promoted to associate professor in 2021. Then, he begins to conduct a one-year visiting scholar course at Hanyang University in Korea supported by "China-Korea young scientists exchange program". He has published over 40 SCI papers in journals such as Nature Communications, Adv. Funct. Mater., Chem. Eng. J., and others, and has served as a reviewer for several SCI journals such as ACS Appl. Mater. Inter. Wu Bin Ying’s main research fields are as follows: 1. Multi-functionalized self-healing elastomer; 2. Sustainable and implantable functionalized elastomer; 3. Stretchable electronics for health monitoring.

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Novel manufacturing technologies enable breakthroughs in the development of electronic devices, biomedical applications, and energy devices.[1-3] In this talk, a novel digitally driven direct-write method for photovoltaic devices and medical soft robots will be described. This extrusion-based process is highly effective in facile materials formulation and also compatible with extra alterations such as printing in a supporting medium, thus empowering and expanding the capability for desirable in-situ chemical modifications and synthesis. The advance will be demonstrated with the new development of microscale multimaterials printing in a supporting medium which is cost-effective, biocompatible, sustainable and offers exceptional rheological properties to maintain the desirable cross-section of the printed devices along the length. In addition, integrated with an on-demand external field, the fabrication platform is also capable of nanoscale fabrication and allows in-situ manipulation of material composites which is highly demanding in the fabrication of large-area nanomesh electrodes. Along with the development, stabilizing nanomaterial surfaces, a critical issue for the stability of electronic devices, will also be described. The latest device performance investigation will follow, in conjunction with computational modeling and practical demonstration for specific energy and biomedical applications.

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Dr Jaemin Lee is currently a University Academic Fellow (equivalent to an Assistant Professor) at University of Leeds. He has obtained his PhD at KAIST in Korea and worked as a Research Fellow at the University of Warwick. Since joining the university in 2020, he has been working on a project on the development of magnetic composites for biomedical devices where he focuses on materials and process engineering. Some of his past projects include the development of scalable conductive nano-materials and manufacturing processes for energy conversion and storage devices and the interface engineering of advanced organic/inorganic materials for large-area display and energy applications.

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Radical ionic metal-organic frameworks (MOFs), prepared by the external stimuli-induced redox process, have been widely reported for their unique optical, magnetic, and electronic properties. However, the forcibly formed radical ionic states are generally short-lived and, hence, not amenable to the visualization of structural transition. Herein, we report thermally reduced radical-anionic MOFs obtained via electron transfer from anions to naphthalenediimide (NDI) moieties during high-temperature solvothermal synthesis. As thermal energy is evenly distributed throughout the solution, the resulting MOF crystals are comprised of homogeneously distributed radical anionic NDI moieties, which is advantageous for direct crystallographic observation of the structural changes that accompany the redox process. Depending on the stimulus type such as X-ray and IR, no additional electron-donating guest molecules were required for reduction, which indicates the presence of multiple electron transfer pathways within the MOF building blocks. In particular, the unusual IR-induced reduction into radical anionic MOFs leads to its practical and reproducible photothermal conversion upon IR irradiation. This presentation provides an insight into the strategic use of an in-situ formed ligand stacks as an organic building block to facilitate functional radical anionic MOFs.

Biography
Dr. Jinhee Park is an associate professor in the Department of Physics and Chemistry at the Daegu Gyeongbuk Institute of Science and Technology (DGIST). She received her B.S. (2005) and M.S. (2007) in Chemistry from Pohang University of Science and Technology and Ph.D. (2013) in Chemistry from Texas A&M University under the supervision of Prof. Hong-Cai Zhou. Prior to joining DGIST, she was a senior researcher at the Korea Electrotechnology Research Institute from 2013 to 2015. Her research focuses on the development of porous materials for environmental and energy applications.

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Functionalized poly(p-xylylenes) can be deposited via chemical vapor deposition (CVD) polymerization to generate polymer materials. For instance, such a CVD process can prepare the polymer as a thin polymer coating that can be generically applied to a wide variety of substrates and establish a reactive interface that allows for further modification; related applications have been shown to provide engineered interface properties to resist bacteria/biofilm formation, to prevent non-specific adsorption of proteins and cells (antifouling), and to manipulate cellular activities including proliferation, differentiation, and spheroids formation for a range of cells and stem cells. Furthermore, the coating technology has used for the encapsulation of liquids and to result in a revolutionary production of a intraocular lens (IOL), and the new IOL ehxibited: (i) enhanced compatibility and stability to avoid leaching of potential harmful substances to the surrounding biological environment and (ii) customizable optical and biological properties for diverse patient needs. Finally, instead of forming conventional thin films, the vapor deposition of the poly-para-xylylene polymers on a dynamic substrate, i.e., sublimating ice, was found to produce three dimensional bulk materials and composites with controllable porosity and size.

Biography
Prof. Hsien-Yeh Chen received his B.S. degree in Chemical Engineering from National Taiwan University in 1999, a M.S. degree in Chemical Engineering from University of Michigan in 2004, and a Ph.D. degree in Chemical Engineering also from University of Michigan in 2008. Currently, he is a Professor at the Department of Chemical Engineering in National Taiwan University.
His research is focused on biomedical engineering by using vapor-based polymers for biomaterials and biomedical devices. These advanced coatings and materials have been successfully applied on bone and tooth implants, drug-eluting stent, intraocular lens, micro- and nano-colloids, nanomedicine carrier, microfluidic device, and bio-MEMS device. His polymer technology has provided biomaterials with properties including antifouling for proteins, cells, and platelets, antibacterial activities, cell differentiation manipulations, superhydrophobic/superhydrophilic interactions, and surface micro- and nano-structuring. During his professorship in NTU from 2010 to present, he has published more than 70 papers in esteemed journals including Nature Communications, Advanced Functional Materials, JACS, ChemComm, Chemistry of Materials, Applied Materials Today, ACS Applied Materials & Interfaces, Langmuir, and etc. Prof. Chen’s research innovations were filed and granted with more than 30 patents worldwide and were recognized by receiving International Inventor Prize “Pride of the Nation Academic Award for Outstanding International Achievement” in 2021. He was also the receiver of Ta-You Wu Memorial Award (Highest Award for Young Scientist in Taiwan) in 2017, National Award for the Innovation in Biotechnology of Taiwan in 2016 and 2023, and the 2nd Green Chemistry Application and Innovation Awards in 2021, and the SCEJ Award for Outstanding Asian Researcher and Engineer in 2021.

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Responsive complex emulsions provide a unique sensing platform using the tunable interactions at the liquid- liquid interfaces. In this presentation, we report our progress toward the fabrication and applications of chemical sensors based on complex emulsions for distributed real-time sensors. These dynamic, multicomponent emulsions behave as a natural sensor with reconfigurable morphologies that are extremely sensitive to the chemical environment. Specifically, the unique coupling among their chemical, physical, and optical properties can be leveraged to detect different classes of biomolecules and environmental contaminants. Specifically, our sensors detect the changes in opacity, direction of fluorescent emission, and fluorescent transmission, respectively. The selective recognitions that give rise to changes in the optical properties are governed by functionalized responsive surfactants and interfacial tensions. Furthermore, we will discuss our recent effort to detect a class of emerging contaminants, per- and polyfluoroalkyl substances (PFAS). We test the hypothesis that different behaviors at complex interfaces will give rise to the discriminating power necessary to distinguish PFAS from hydrocarbon surfactants. We anticipate that the incorporation of responsive all-liquid materials will provide a cost-effective, easily tunable, and portable alternative to laboratory-based analytical methods for on- site sensing applications.

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Prof. Suchol Savagatrup obtained his B.S. in chemical engineering from UC Berkeley (2012). He earned his Ph.D. in chemical engineering from UC San Diego (2016) under the guidance of Prof. Darren Lipomi and completed his postdoctoral training with Prof. Timothy Swager in the Department of Chemistry at MIT. Suchol began his independent scientific career as an Assistant Professor in the Department of Chemical and Environmental Engineering at the University of Arizona in 2019. His research interest focuses on the development of responsive soft materials with bio-inspired functions for applications in biomimicry, portable chemical and biosensors, and on-site environmental monitoring. He is a recipient of the Army Research Office Young Investigator Award (ARO YIP) and the Regents Research Grant from the Arizona Board of Regents.

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For the sense of sight, we can purchase HD screens to recreate nearly any image or movie. For touch, however, we are not yet able to recreate the variety of sensations from our everyday experiences. An accurate and rich recreation of tactile sensations could have broad implications in human machine interfaces, soft robotics, and disability rehabilitation. While most haptic devices rely on reconfigurable bumps or electrical stimulation, one possible avenue we explore for is creating tactile sensations through materials chemistry.
A challenge behind controlling touch is that touch is a complex mechanical event between the finger—a heterogenous and deformable interface—and an object. During touch, friction generated between the finger and object produces a variety of mechanical vibrations, which ultimately forms a tactile perception. In this talk, we describe our efforts to use materials coating to both control touch and to study touch. In the first part, we will discuss our efforts in using silane-derived monolayers and our findings that humans can perceive single atom substitutions within silane-coated silicon wafers, thus opening the possibility for molecular-scale control over touch.1,2 In the second part, we use tools from materials chemistry to enable psychophysical investigations on the perception of softness. By creating samples which react to touch in a known manner, we can perform our investigations with high “ecological validity”, i.e., perform studies in a manner similar to everyday human exploration. Together, our studies show how techniques and advances in modern materials chemistry can be applied towards haptic devices.

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Dr. Charles Dhong is an assistant professor at the University of Delaware in the Dept. of Materials Science & Engineering and the Dept. of Biomedical Engineering. He received his B.S from the University of California, Berkeley in Chemical and Biomolecular Engineering and received his Ph.D. at the Johns Hopkins University in Chemical and Biomolecular Engineering. He conducted his postdoctoral research at the University of California, San Diego in the Dept. of NanoEngineering. His research is currently supported through several grants from the NIH.

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Metamaterials or metasurfaces – materials that are engineered to have properties that are not found in natural materials – allow us to overcome physical limitations. Metasurface science is further not only expanding field of optics and photonics by providing ultra-compact and multifunctional flat optical devices, also resolves challenging problems in diverse sectors like healthcare, optical display, imaging, and military affairs. In this talk, I will introduce metasurface-enhanced holography, imaging, and biosensing technologies. First, I will show multifunctional metaholograms for interactive displays, optical security labels, and visual gas sensors. By integrating high-efficiency dielectric metaholograms with liquid crystal cell, we are able to actively control holographic images, which are reacting with external targeted stimuli. Furthermore, advanced metasurface design algorithm enables multiple information encoding in a single device like coloration and polarization states. Secondly, I will explain an electrically tunable varifocal metalens that operates at visible wavelengths and a point cloud generating metasurface for advanced 3D depth imaging or LiDAR applications. The electrically tunable varifocal metalens will enable solid-state zoom tuning camera. The point cloud generating metasurface is able to spread 10K dots over 2π full space with over 80% diffraction efficiency, which is promising for scanning-free LiDAR technology. Finally, I will show metasurface-driven molecular sensing technologies including multiplexed plasmon resonance energy transfer (PRET) hyperspectral imaging and ultrafast photonic PCR. Such multiplexed nanospectroscopy method can open up a new path for real-time molecular sensing and imaging methods. The perfect absorber-based metaPCR accelerates chip-based point-of-care testing applications.

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Inki Kim is an Assistant Professor in Department of Biophysics, Institute of Quantum Biophysics at Sungkyunkwan University (SKKU). He received his Ph.D degree (with Chang Kun Soo Memorial Award) in Mechanical Engineering at Pohang University of Science and Technology (POSTECH), and B.S. degree (with highest honor) in Mechanical Engineering at Ulsan National Institute of Science and Technology (UNIST). Prior to joining SKKU, he was a Sejong Science Fellow in Mechanical Engineering at POSTECH. He has published 50+ peer-reviewed articles in journals such as Nature Nanotechnology, Nature Communications, Science Advances, Advanced Materials, Materials Today, and Light: Science and Applications. Currently his research interests are experimental nanoscale photonics including metamaterials, metasurfaces, plasmonics, nanofabrications, bionanophotonics, quantum biophysics, and quantum-integrated medical devices.

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Mechanoluminescence (ML) materials enable the transformation of mechanical stimuli into optical signals. However, current ML devices have limited luminescent programmability and mechanical tunability due to the relatively simple geometries restricted by conventional fabrication techniques such as casting and molding. This talk will present a strategy that is applicable for various types of zinc sulfide (ZnS)-based phosphors for allowing the fabrication of ML elastomer into complex 2D or 3D geometries with periodic cellular structures. Here, we demonstrate that different cellular structures with tunable mechanical properties enable programmable structure-dependent ML behaviors including anisotropic and isotropic luminescence. Further, we exploit the quantitative structure-stress- luminescence relationship, which provides fundamental knowledge support for designing next-generation ML-based stress sensors and wearable devices.

Biography
Jinhye Bae is an Assistant Professor in the Department of NanoEngineering at the University of California San Diego. She received her Ph.D. in Polymer Science and Engineering at the University of Massachusetts Amherst in 2015, then worked in the School of Engineering and Applied Sciences at Harvard University as a Postdoctoral Fellow. Her research focuses on understanding the physical and chemical properties of polymeric materials to program their shape reconfiguration and responsiveness. Her research interests also include the integration of material characteristics into new structural design and fabrication approaches for applications in biomedical devices, soft robotics, actuators, and sensors. She has received several awards including the KIChE President Young Investigator Award (2021), the ACS PRF Doctoral New Investigator Award (2021), and the UCSD Faculty Career Development Program Award (2021), etc. Also, she has been selected as the Emerging Investigator in Polymer Chemistry (2020), Soft Matter (2022), and Nanoscale (2023).

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Intrinsically flexible, solution-processable conjugated polymers are highly attractive for low- cost roll-to-roll production of thin film semiconductor devices for Internet-of-Everything (IoE). With considerable improvements in charge carrier mobilities, environmental and electrical stabilities are now considered final hurdles before the commercialization of conjugated polymers. Recent studies have achieved much progress on transistors stability enhancement by removing interface traps and water molecules in conjugated polymers; however, the same issue has been rarely addressed for Schottky diodes despite playing critical roles, e.g., wireless communication and energy harvesting, in configuring thin film IoE devices. Here, we investigate the origin of Schottky contact instability caused by a low work function cathode and propose a facile way to overcome. We show that aluminum, the most widely used as cathode metal, forms oxygen vacancies generating a number of charge traps over an extended period of time when deposited on printed conjugated polymers. This not only gradually degrades rectification ratio of the Schottky diodes but also causes a severe bias stress effect during the operation. We introduce few-nanometer-thick zinc-oxide sacrificial interlayer between the conjugated polymer and cathode to eliminate those oxygen vacancies without charge injection efficiency decrease, thereby achieving an exceptional environmental and operational stability. The printed polymer Schottky diodes show a consistent rectifying operation at 13.56 MHz over few months with only negligible changes in their electrical characteristics.

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Recent years, neuromorphic electronics has received extensive attention because of important applications in brain-inspired chips and artificial sensorimotor nerves. Rapid development of the field puts forward higher requirements for the basic functional units. . The presenter will briefly introduce their recent progress in the research field, which includes the materials selection, device structure design and performance regulation, and their application in neuromorphic systems .

Biography
Prof. Wentao Xu is currently a distinguished professor at Nankai University, he received his B.S. from Beijing Normal University and his Ph.D. from Pohang University of Science and Technology (POSTECH). He was a research associate professor at Seoul National University, and visiting scholar in Prof. John Rogers group at University of Illinois at Urbana-Champaign (UIUC) and in Prof. Zhenan Bao group at Stanford University. He is found by National Key R&D Program of China (2022), the National Science Fund for Distinguished Young Scholars (NSFC, 2021), the Tianjin Science Fund for Distinguished Young Scholars (2019), and the Tianjin Haihe Talent Program (Leading Talent, 2018). His research mainly focuses on the field of flexible electronics, neuromorphic electronic devices, artificial sensorimotor neurons, and electrohydrodynamic nanowire printing techniques. He has published more than 70 papers as the corresponding/first author in Science, Science Advances, Nature Communications, Matter, Research, Advanced Materials and other journals. He currently serves as an editorial board member of SmartMat, and Chinese Chemical Letters.

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Since Lippmann’s first study in 1875, electrowetting has been widely explored as an effective means for small-scale liquid handling and actuation using the surface tension of liquids modulated by an application of the electric field. The dominance of surface tension forces over body forces in micro/meso scales allows several benefits over other microfluidic mechanisms, including large forces, fast response time in microsecond ranges, and low-power operation. In this talk, a broad perspective of the electrowetting is presented, covering from materials to its applications for optics and solar energy using liquid prism technology. To improve electrowetting performance, our first study conducted was on a high-capacitance dielectric material, called an ion gel, which offers 2 to 3 orders higher capacitance (c ≈ 10 μF/cm²) than that of conventional dielectrics such as SiO₂. This material benefit was used for electrowetting actuation of a liquid prism device that enables non-mechanical beam steering as wide as ±19°. We further discuss an arrayed form of the liquid prisms with a large aperture area and potential applications to a liquid-based Fresnel lens enabling 3D focal control and a solar indoor lighting system as a new optofluidic approach towards green and sustainable buildings.

Biography
Dr. Sung-Yong (Sean) Park is an associate professor in the Department of Mechanical Engineering at San Diego State University (SDSU). Before joining SDSU in 2019, he was an assistant professor in the Department of Mechanical Engineering at National University of Singapore (NUS) since 2013. He also worked as a research scientist at Teledyne Scientific Company (formerly known as Rockwell Science Center) where he led several cutting-edge R&D projects funded by ARPA-E and NASA. He received his doctoral degree from the University of California at Los Angeles (UCLA) in 2010 (advisor: Prof. Eric P.Y. Chiou) and was further trained as a post-doctoral researcher at the UCLA Optofluidic Systems Laboratory. Dr. Park’s research interests lie in optofluidic bio and energy systems with applications to biosensors, lab-on-a-smartphone, water/air quality detection, solar indoor lighting, and triboelectric energy harvesting. He was awarded an NSF CAREER grant in 2021. He was also a recipient of the Harry M. Showman Prize from Henry Samueli School of Engineering and Applied Science (HSSEAS) at UCLA in 2010 and the Graduate Student Researcher Scholarship from the UCLA Mechanical Engineering Department in 2006.

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This talk will give an introduction of the state-of-art micro solid oxide fuel cells (micro-SOFCs) using silicon-based micromachining technology to achieve a breakthrough increase in time of flight of drone operation by developing a larger lateral dimension of such electrochemical energy conversion devices. The lateral dimension of the nanoscale thin film electrolyte membrane, which the thickness is only tens of nanometer, has been chronically limited to only hundreds of micrometers scale due to the fragile thin oxide membrane. Through our unique design from the mechanics approach to relieve the stress level of the membrane, and with the help of a simple combinatorial etching process, the lateral dimension of the micro-SOFCs electrolyte membrane was increased to several millimetres scale. The technology breakthrough introduced here can further the practical application of such promising device closer to commercial manufacturing stage in the area including unmanned aviation vehicles (UAVs) or military drones which needs longer time of flight for expanding drone applications.

Biography
Prof. Yoon obtains his Ph.D. degree (2009) in Mechanical Engineering with two Master degrees from Mechanical Engineering (2005) and Electrical Engineering (2008) from Stanford University. Prof. Yoon also obtains his Ph.D. minor degree in Management Science and Engineering (2009) in Stanford University. His current research include 3D printed biosensors, drone power souces using nano thin-film fabrication, and smart manufacturing for advanced nano drone. Currently he is an Associate Professor in the department of mechanical Engineering at KAIST, a President of the University Industrial Technology Force (UNITEF), Advisor in KAIST Startup Center, Director of the Advanced Drone Innovation Center, Advisory Partner of Enlight Ventures Capital, Venture Partner of ES Investor Group and Visiting Professor of Nanyang Technological University. He has published more than 120 international journal articles (SCI indexed) and 170 international conference proceeding papers, Besides his resaerch, Prof. Yoon is interested in an academic-based entrepreneur career as a start-up accelerator. For the past years, he has been actively incubating start-ups where he took the lead to raise startup funding from government entities and renowned global venture capitals.

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In the age of artificial intelligence (Ai), conformable edge sensors (also termed electronic-skin sensors) enable big data generation from everything, hence are at the heart of indispensable Ai-supporting hardware. Taking advantages of the conformal interface, electronic-skin sensors have obtained unprecedented health information from the skin, which cannot be detected by non-conformal bulky sensors. However, poor reliability issues of electronic-skin sensors such as limited lamination time on the skin, degradation of sensing accuracy, and large device-to-device variations are critical roadblocks to the industrialization. Furthermore, it should be highlighted that most reliability issues are induced from heterogeneous interfaces at sensors, circuits, and integration platforms.
In this talk, I will introduce my group’s vision to develop a comprehensive engineering techniques on heterogeneous interfaces, termed SMART multi-level interface engineering, to address grand challenges at every hardware level and to provide stepping-stones for advancement of electronic skins into the commercialization stage. At (i) integration platform-human skin interface, (ii) platform-sensor interface, and (iii) metal-semiconductor interface, SMART engineering has been conducted, resulting in long-term reliable cutaneous monitoring including two-weeks-tracking of skin regeneration on the forearm [1]. Lastly, I will discuss future aspects of SMART multi-level interface engineering for conformable edge Ai with electronic-skin sensors.

Biography
Prof. Hanwool Yeon received his Bachelor degree (2009) and Ph. D. (2016) degree from Seoul National University at the department of materials science and engineering (MSE). His Ph. D. advisor was Prof. Young-Chang Joo and his Ph. D. study focused on a reliability of semiconductor devices with metallization technologies. As a postdoctoral associate at Massachusetts Institute of Technology (MIT), he developed metallization-based resistive switching memory array and skin-conformable electronics with inorganic sensors over four years, under supervision of Prof. Jeehwan Kim. After he joined Gwangju Institute of Science and Technology (GIST) as an assistant professor at School of Materials Science and Engineering (SMSE) on Dec. 2021, he has been leading a research group, SMART metallization lab. His current research interests are innovative metallization technologies for next-generation semiconductor electronics, spanning from metal contact for neuormorphic devices, free-form metal interconnects, to wafer-scale vertical integration technologies. He is a recipent of SAMSUNG ELECTRO-MECHANICS Best Paper Award (2016) and 14th POSCO Science Fellowship (2023).

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The growth of small-scale soft robotics requires new electronic and actuating materials. While some progress has been made with flexible organic materials, these materials still don't match the performance of inorganic materials like ceramics in terms of their functionality. The challenge has been that ceramics, despite their superior functionality, are rigid, making them unsuitable for flexible and soft devices. However, this changes when ceramic materials are reduced to nanoscale size, revealing interesting mechanical properties.
In this talk, I will present our recent discoveries about unusual mechanical behaviors in a few nanometer-thick ceramic microstructures made of magnetic CoFe¬2O4 and piezoelectric BaTiO3. Unlike their bulk counterparts, these films are flexible, super-elastic, and have shape-memory abilities. Additionally, their magnetoelectric properties can be readily adjusted due to their high resistance to strain.
Our findings have the potential to pave the way for developing high-performance ceramic-based flexible sensing units, memory elements, and actuating devices for small-scale soft robots.

Biography
Dr. Xiangzhong Chen has been an associate professor at Fudan University since March 2023. His group is working on bridging functional materials (especially magnetic materials and functional dielectric materials) with novel devices such as microrobots, soft robots, and flexible electronics, for different applications, with a major focus on biomedicine.
He received a B. Eng. in Polymer Materials and Engineering in 2007 and a doctoral degree in Chemistry from Nanjing University in 2013, majoring in Polymer Chemistry and Physics. During his doctoral study, he visited the Materials Research Institute at The Pennsylvania State University (Oct. 2011- Apr. 2013) in the United States. In November 2013, he joined Multi-Scale Robotics Lab (MSRL) at ETH Zürich as a postdoctoral researcher and was then promoted to senior scientist.