Article
Engineering, Manufacturing
Nicholas A. Rodriguez, Hongtao Song, Morgan Chen, James S. Oakdale, Eric B. Duoss, Carolyn C. Seepersad, Richard H. Crawford
Summary: Spatial light modulators using liquid crystal devices have limitations, but replacing the film polarizers with wire grid polarizers can overcome these limitations and enable polarization and patterning of high intensity UV light.
ADDITIVE MANUFACTURING
(2022)
Article
Materials Science, Multidisciplinary
Yuanyi Fan, Jinkui Chu, Ran Zhang, Ze Liu, Jianying Liu, Chuanlong Guan, Zhichao Zhang
Summary: A universal design and fabrication scheme is proposed for a cascaded aluminum wire-grid-based vis-NIR circular polarizer. The design involves using an aluminum wire-grid as a broadband polarization converter and linear polarizer, which are cascaded to form a circular polarizer with strong circular polarization transmittance difference and circular polarization extinction ratio in vis-NIR. The redshift of the peaks is achieved by increasing the distance between the polarization converter and the linear polarizer, and the phenomenon is attributed to anisotropic thin-film interference. The circular polarizer is fabricated using nano imprint lithography and nano transfer printing, offering cost-effectiveness and high production efficiency.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Optics
Itsunari Yamada
Summary: This article presents a reflective-type polarization wavelength filter fabricated by anodizing a Ti grating film, which exhibits excellent polarization filtering performance.
Article
Chemistry, Multidisciplinary
Jungchul Song, Jae Sub Oh, Min Jun Bak, Il-Suk Kang, Sung Jung Lee, Ga-Won Lee
Summary: This study successfully fabricated large-area wire grid polarizers (LA-WGPs) with a 50 nm half-pitch using ArF immersion lithography. To overcome the limitations of the shot field size, a zero-distance stitching process was proposed, along with optical proximity correction (OPC) to compensate for mutual interference between shot fields. By utilizing nano-imprint technology, LA-WGPs with over 80% transmittance in the visible light region were achieved, with potential for further performance improvements depending on the etch process.
Article
Chemistry, Physical
Hyesu Kim, Seok Young Ji, Sung-Hak Cho, Joo-Yun Jung, Won Seok Chang
Summary: Theoretical and experimental investigations were conducted to enhance the performance of a single-layer Au grating as a wire grid polarizer in the mid-wavelength infrared range using femtosecond laser annealing. The results showed a significant improvement in the extinction ratio of the WGP, indicating the potential for low-cost and large-scale production of MWIR WGPs with improved performances through a simple NTP and FSL annealing process.
APPLIED SURFACE SCIENCE
(2022)
Article
Polymer Science
Jaeyu Lee, Seongjun Moon, Yong Bin Han, Seung Jae Yang, Joerg Lahann, Kyung Jin Lee
Summary: In this study, anisotropic multicompartmental microfibers composed of different polymers are prepared via charge reversal electrohydrodynamic (EHD) co-jetting, resulting in microfibers with distinct compositional boundaries. The charge reversal during EHD co-jetting enables facile fabrication of multicompartmental microfibers with desired composition and tunable inner architecture, broadening their spectrum of potential applications in functional microfibers and cell scaffolds with multiple physical and chemical properties.
MACROMOLECULAR RAPID COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Yi Ming Yin, Hua Yang Li, Jin Xu, Chen Zhang, Fei Liang, Xin Li, Yang Jiang, Jin Wei Cao, Han Fang Feng, Jia Nan Mao, Ling Qin, Yi Fan Kang, Guang Zhu
Summary: Flexible pressure sensors produced using bottom-up digital light processing (DLP) 3D printing technique offer a designable lattice structure, high sensitivity, superior linearity, and controllable mechanical properties. These sensors can endure repeated compression cycles and are suitable for various practical applications such as real-time pulse monitoring, voice recognition, and spatial pressure distribution detection.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Jaebum Sung, Hongyun So
Summary: This study demonstrates the use of 3D printing to create a variety of microgrid patterned surfaces, which can significantly reduce the adhesive forces of polymer surfaces by altering the angles and printing resolution.
SURFACES AND INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Minwook Kim, Dong Kyo Oh, Jeong Dae Kim, Minsu Jeong, Hongyoon Kim, Chunghwan Jung, Jungkeun Song, Wonjun Lee, Junsuk Rho, Jong G. Ok
Summary: We propose a rapid and simple method to create Ag nanostructures by using direct mechanical patterning and thermal annealing. The Ag nanostructures are obtained from ionic Ag ink coating that is spin-coated onto the desired substrate and then reduced by thermal annealing. The study systematically investigates the optimal patterning conditions and demonstrates the tunable photonic functionality of Ag architecture.
Article
Chemistry, Analytical
Lei Wei, Guoqing Fang, Zhongwen Kuang, Lin Cheng, Huaping Wu, Daoyou Guo, Aiping Liu
Summary: This study introduces an accessible, low-cost fabrication and integration scheme for flexible microfluidic architecture capable of reliable sweat collection and sensing. It utilizes low-cost 3D printing technology to create positive molds from easy-to-print materials for personalized customization of microfluidic channels. An innovative approach is proposed to encapsulate microfluidic channels and integrate pH sweat sensors, providing a cost-effective alternative to soft-lithography methods and reducing the threshold of microfluidic development and manufacture.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Multidisciplinary Sciences
Ryohei Hokari, Kyohei Takakuwa, Kengo Shiomoto, Genki Kuwano, Kazuma Kurihara
Summary: As society becomes smarter, advanced optical sensing and imaging technologies utilizing visible and near-infrared regions have become increasingly prevalent. Wire-grid polarizers are effective in improving the signal-to-noise ratio of optical systems and enabling more advanced object detection and analysis. To achieve cost-effective manufacturing, a wire-grid polarizer with a nano-triangular wave-shaped structure was designed and developed, which can be fabricated using general-purpose manufacturing equipment, such as nanoimprinting and metal deposition processes. The high-performance polarizers obtained through these methods contribute to cost reduction and improved manufacturability.
SCIENTIFIC REPORTS
(2023)
Article
Computer Science, Interdisciplinary Applications
Nazariy Jaworski, Nazariy Andrushchak, Mykhailo Lobur, Marek Iwaniec
Summary: In this study, a finite element model of a terahertz substrate-based wire grid polarizer is developed and implemented using COMSOL software. The simulation results show excellent agreement with known experimental and simulation data.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2021)
Article
Polymer Science
Zhuoying Zhou, Zhongsen Zhang, Kunkun Fu, Bin Yang
Summary: This study proposes a method for treating 3D-printed composite grid structures using induction heating to address the issues of internal defects and insufficient mechanical properties. The results show that the combination of induction heating and vacuum pressure effectively reduces porosities within the structures and significantly improves the bending strength and modulus of the grid-stiffened structures.
Article
Materials Science, Multidisciplinary
Zhengliang Li, Xuyang Zhang, Jiaqi Shan, Cuilan Liu, Xingzhong Guo, Xiaoyu Zhao, Hui Yang
Summary: Silver nanowire transparent conductive films (AgNW TCFs) were prepared by screen printing conductive ink on a PET substrate, and the effects of ink compositions and oily stencil on the optoelectrical properties of AgNW TCFs were investigated. The resulting AgNW TCFs exhibited low sheet resistance, high transmittance, and high uniformity, and could be patterned and personalized through the screen printing process.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Optics
Sun Xuhui, Wang Zhiwen, Tian Wentao, Liu Weicheng, Wei Juan, Zheng Hongyu
Summary: This paper proposes a method for preparing a multi-directional polarization filter using one-dimensional nano-grating polarizers. The effects of laser processing parameters on ablation morphology and optical transmittance are studied. Experimental results demonstrate the high measurement accuracy and flexibility and cost-effectiveness of the proposed filter.
OPTICS AND LASER TECHNOLOGY
(2022)
Review
Materials Science, Multidisciplinary
Young Jin Jo, Jehyung Ok, Soo Young Kim, Tae-il Kim
Summary: Ion-conducting polymers, such as hydrogels, have soft, flexible, and stretchable properties enabling interactions with living organisms, and are being utilized in sensors and electronic components for various applications. Advancements in this unconventional electronics are driven by the material's unique properties and its potential for biomedical applications in integrated systems.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Materials Science, Multidisciplinary
Jiayi Yang, Ki Yoon Kwon, Shreyas Kanetkar, Ruizhe Xing, Praneshnandan Nithyanandam, Yang Li, Woojin Jung, Wei Gong, Mary Tuman, Qingchen Shen, Meixiang Wang, Tushar Ghosh, Kony Chatterjee, Xinxin Wang, Dongguang Zhang, Tae-il Kim, Vi Khanh Truong, Michael D. Dickey
Summary: The research presents a soft capacitive pressure sensor based on a bilayer of liquid metal elastomer foam (B-LMEF), which has high sensitivity and a large dynamic range, allowing it to operate over a wide range of stress levels.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Nanoscience & Nanotechnology
Jong Uk Kim, Hyejin Park, Jehyung Ok, Juheon Lee, Woojin Jung, Jiwon Kim, Jaehyun Kim, Suhyeon Kim, Yong Ho Kim, Minah Suh, Tae-il Kim
Summary: The study introduced a CSF-philic PDMS window coated with PVA, which effectively reduces bubble trapping, enhances biocompatibility, and maintains long-term optical clarity of cranial windows. Experimental results demonstrate minimal damage to neuronal tissues and attenuated immune response with this window.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Woojin Jung, Gyan Raj Koirala, Ju Seung Lee, Jong Uk Kim, Byeonghak Park, Young Jin Jo, Chanho Jeong, Haeleen Hong, Kiyoon Kwon, Yeong-sinn Ye, Jiwon Kim, Kanghyuk Lee, Tae-il Kim
Summary: This study demonstrates the filling of submicrometer channels with liquid metal using solvent assistance, as well as the design guidelines for obtaining structural stability without dewetting. A stretchable NFC device was successfully produced using stable LM vias, and a concept for modular stretchable electronics based on the cohesive nature of liquid metal is proposed.
Correction
Chemistry, Multidisciplinary
Woojin Jung, Gyan Raj Koirala, Ju Seung Lee, Jong Uk Kim, Byeonghak Park, Young Jin Jo, Chanho Jeong, Haeleen Hong, Kiyoon Kwon, Yeong-sinn Ye, Jiwon Kim, Kanghyuk Lee, Tae-il Kim
Article
Chemistry, Multidisciplinary
Hyesu Choi, Yichi Luo, Gina Olson, Phillip Won, Joo Hwan Shin, Jehyung Ok, Ye Ji Yang, Tae-il Kim, Carmel Majidi
Summary: Kirigami, a traditional paper-cutting art, is used to create mechanically robust circuitry for stretchable devices through structural deformation. This study introduces Liquid Metal based Elastic Kirigami Electrodes (LM-eKE) with eutectic gallium-indium (EGaIn) coating, which can be stretched to 820% strain with only a 33% increase in electrical resistance. The LM-eKE maintains high electrical conductivity even during extreme deformation, allowing for stable electrical operation of wearable health monitoring devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Jehyung Ok, Sumin Park, Yei Hwan Jung, Tae-il Kim
Summary: Wearable and implantable electronic devices have been developed to continuously monitor and analyze the concentration of cortisol, a hormone released in response to stress. These devices provide wireless real-time analysis, overcoming the limitations of traditional cortisol measurement methods. This technology holds great potential for stress monitoring and management.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ju Seung Lee, Jiwoong Choi, Gha Yeon Park, Seung Ji Kang, Jae-hun Yang, Youngkyu Lee, Myunghwan Choi, Kwangmeyung Kim, Tae-il Kim
Summary: The development of fabrication technologies and new materials has significantly improved the performance of electronic devices while reducing their overall size. However, micro/nano-size electronic devices have faced issues related to isolated heat generation in concentrated areas, especially in bio-integrated devices. To address this problem, a microscale light emitting diode (mu LED)-based neural probe with an injectable heat dissipation guide made of boron nitride (BN) nanomaterials is introduced. This heat dissipation guide effectively dissipates heat, leading to improved optical output performance of mu LEDs and enhanced lighting transmission through brain tissue without thermal damage. Additionally, it shows remarkable improvement in the therapeutic effect of photodynamic therapy in mouse cancer cells.
Article
Materials Science, Multidisciplinary
Jiayi Yang, Praneshnandan Nithyanandam, Shreyas Kanetkar, Ki Yoon Kwon, Jinwoo Ma, Sooik Im, Ji-Hyun Oh, Mohammad Shamsi, Mike Wilkins, Michael Daniele, Tae-il Kim, Huu Ngoc Nguyen, Vi Khanh Truong, Michael D. Dickey
Summary: Conductive textiles can be created by coating fabric with liquid metal particles, which provides possibilities for human-machine interfaces and wearable electronics. In this method, the fabric is dipped into a suspension of liquid metal particles at room temperature. The coated fabric remains electrically insulating due to the native oxide on the particles, but can become conductive by compressing it to rupture the oxide and allow particle percolation. Conductive circuits can be patterned on the textile by compressing it with a patterned mold. The electrical conductivity of these circuits can be improved by increasing the particle coating. The LM-coated textiles also possess antimicrobial protection against Pseudomonas aeruginosa and Staphylococcus aureus, and the conductive patterns autonomously heal when cut.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Biomedical
Wei Ouyang, Wei Lu, Yamin Zhang, Yiming Liu, Jong Uk Kim, Haixu Shen, Yunyun Wu, Haiwen Luan, Keith Kilner, Stephen P. Lee, Yinsheng Lu, Yiyuan Yang, Jin Wang, Yongjoon Yu, Amy J. Wegener, Justin A. Moreno, Zhaoqian Xie, Yixin Wu, Sang Min Won, Kyeongha Kwon, Changsheng Wu, Wubin Bai, Hexia Guo, Tzu-li Liu, Hedan Bai, Giuditta Monti, Jason Zhu, Surabhi R. Madhvapathy, Jacob Trueb, Maria Stanslaski, Elizabeth M. Higbee-Dempsey, Iwona Stepien, Nayereh Ghoreishi-Haack, Chad R. Haney, Tae-il Kim, Yonggang Huang, Roozbeh Ghaffari, Anthony R. Banks, Thomas C. Jhou, Cameron H. Good, John A. Rogers
Summary: This article describes a tether-less and battery-less implant that can record electroencephalograms, electromyograms and body temperature in freely moving small animals, as well as perform closed-loop neuromodulation via optogenetics and pharmacology. The wireless and battery-less technology allows for studies that require the use of unconstrained animals and eliminates the limitations of physical tethers and batteries. The implant has a system-on-a-chip with Bluetooth Low Energy for data transmission and a compressed deep-learning module for autonomous operation.
NATURE BIOMEDICAL ENGINEERING
(2023)
Article
Engineering, Biomedical
Kyeongha Kwon, Jong Uk Kim, Sang Min Won, Jianzhong Zhao, Raudel Avila, Heling Wang, Keum San Chun, Hokyung Jang, Kun Hyuck Lee, Jae-Hwan Kim, Seonggwang Yoo, Youn J. Kang, Joohee Kim, Jaeman Lim, Yoonseok Park, Wei Lu, Tae-il Kim, Anthony Banks, Yonggang Huang, John A. Rogers
Summary: Devices for monitoring blood haemodynamics can guide the perioperative management of patients with cardiovascular disease. In this study, an integrated wireless sensor capable of measuring pressure, flow rate and temperature simultaneously and in real time was developed. The device showed comparable performance to clinical tools in large animal models, providing the potential for continuous monitoring of blood haemodynamics in patients.
NATURE BIOMEDICAL ENGINEERING
(2023)
Review
Chemistry, Multidisciplinary
Onuralp Karatum, Min-Jun Gwak, Junghun Hyun, Asim Onal, Gyan Raj Koirala, Tae-il Kim, Sedat Nizamoglu
Summary: Light-based neuromodulation systems provide high-resolution communication with neurons without physical tether. These systems, ranging from nano to centimeter scales, enable control of neural activity in various organs and contexts. Nanotransducers and microphotodiodes convert light into electrical, thermal, and mechanical stimuli, allowing remote and non-contact stimulation of neurons. Integrated devices composed of nano and microscale optoelectronic components enable multimodal and closed-loop optogenetic neuromodulation.
CHEMICAL SOCIETY REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Changrok So, Jong Uk Kim, Haiwen Luan, Sang Uk Park, Hyochan Kim, Seungyong Han, Doyoung Kim, Changhwan Shin, Tae-il Kim, Wi Hyoung Lee, Yoonseok Park, Keun Heo, Hyoung Won Baac, Jong Hwan Ko, Sang Min Won
Summary: Continued research on the epidermal electronic sensor aims to develop sophisticated platforms that reproduce key multimodal responses in human skin. With the help of deep learning technology, the customized regression and classification model can accurately predict the magnitude of the external force, epidermal hardness, and object shape.
NPJ FLEXIBLE ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Joo Hwan Shin, Junmo Kwon, Jong Uk Kim, Hyewon Ryu, Jehyung Ok, S. Joon Kwon, Hyunjin Park, Tae-il Kim
Summary: Researchers have developed a system called BACLoS that improves AI decision-making by analyzing human brain waves and transferring the results to AI. The system uses a device similar to earbuds and tattoo-like electrodes to continuously record high-quality EEG signals and correct or reinforce AI decisions based on ErrP signals. BACLoS has potential applications in autonomous driving vehicles, maze solvers, and assistant interfaces.
NPJ FLEXIBLE ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Young Jin Jo, Soo Young Kim, Jeong Hun Hyun, Byeonghak Park, Seunghwan Choy, Gyan Raj Koirala, Tae-il Kim
Summary: PEDOT:PSS is commonly used in bioelectronics due to its high conductivity and biocompatibility. In this study, conductive fibers were created using fibrillary gelation of PEDOT:PSS, resulting in improved performance for organic electrochemical transistors. These fibers show potential for bio-integrated electronic applications.
NPJ FLEXIBLE ELECTRONICS
(2022)
