Article
Chemistry, Physical
Chi Zhang, Lei Zhang, Zhihua Pu, Bo Bao, Wenyu Ouyang, Dachao Li
Summary: In this study, we propose the preparation of 1D stretchable fiber-shaped electronics via inkjet printing technology for wearable applications. Utilizing precision rotary inkjet printing equipment and surface chemical modification process, high-precision and customizable microfabrication onto ultra-low diameter fiber surfaces was achieved. The fabricating method is non-destructive and can prepare 1D stretchable conductors with remarkable conductivity and mechanical stability for practical applications.
Article
Nanoscience & Nanotechnology
Shuang Wu, Katherine Moody, Abhiroop Kollipara, Yong Zhu
Summary: We report a soft and stretchable resistive strain sensor with high sensitivity, large sensing range, and high robustness. The sensor is made of a silver nanowire network embedded below the surface of an elastomeric matrix. By applying periodic mechanical cuts to the top surface, the current flow in the sensor can be changed from uniform to along the conducting path defined by the open cracks. This stretchable strain sensor can be integrated into wearable systems for monitoring physiological functions and body motions associated with different levels of strain, such as blood pressure and lower back health.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Xinxin Zhao, Hao Guo, Peng Ding, Wei Zhai, Chuntai Liu, Changyu Shen, Kun Dai
Summary: A novel flexible strain sensor with wide sensing range, high sensitivity, low detection limit, and good sensing stability and durability was developed in this study. wrinkling and cracking structures on the conductive layer were integrated into a thermoplastic polyurethane fiber to achieve high-performance strain sensing. Additionally, strain-dependent visualization of the sensor was realized under UV light, demonstrating its broad application prospects in medical treatment, human-machine interface, and environmental monitoring fields.
Article
Engineering, Manufacturing
Dan Liu, Heng Zhang, Haomin Chen, Jeng-Hun Lee, Fengmei Guo, Xi Shen, Qingbin Zheng, Jang-Kyo Kim
Summary: In this work, highly sensitive and stretchable strain sensors are designed using single-walled carbon nanotube (SWNT)/graphene oxide (GO) hybrid thin films with unique wrinkled, cracked and bridged morphologies. The sensors exhibit a wide sensing range and high stability, enabling them to monitor full range human motions.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Engineering, Environmental
Xiaoyang Guan, Bingang Xu, Junxian Huang, Titao Jing, Yuanyuan Gao
Summary: A novel stretchable fiber-shaped triboelectric nanogenerator (AXFTENG) was fabricated with excellent power generation performance for biomechanical energy harvesting and self-powered sensing. This nanogenerator could light up LEDs, charge commercial capacitors, and power electronic devices such as watches and calculators.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Dan Lv, Dianyi Liu
Summary: This study presents the fabrication of intrinsically stretchable fiber-shaped organic solar cells (FOSCs) using a polymer-based active layer. The all-polymer FOSCs demonstrate superior intrinsic stretchability, maintaining over 90% of the initial efficiency under a stretch strain of 50%. By incorporating SEBS elastomer, the FOSCs can withstand ultrahigh stretch strains of over 80% and retain 90% of the initial efficiency after 1000 stretching cycles.
Article
Nanoscience & Nanotechnology
Dongjoon Rhee, Boyun Han, Myeongjin Jung, Jihyun Kim, Okin Song, Joohoon Kang
Summary: In this study, a solution-based hierarchical structuring method was reported to create continuous stretchable semiconductor films through the self-assembly of two-dimensional nanosheets. By forming hierarchical wrinkles with multigenerational structures, the films achieved crack resistance and significantly improved photoresponsivity and strain sensor performance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Sangkyu Lee, Kyumin Kang, Heewon Choi, Jiyong Yoon, Yewon Kim, Soojung An, Hyunjin Jung, Duhwan Seong, Kyuha Park, Hyoungwon Baac, Donghee Son
Summary: Soft bioelectronic systems with modulus matching to human skin have gained attention for their strain-insensitive electrical performance. In this study, a multifunctional device was developed through simple fabrication processes and showed stable performance on skin, making it a promising candidate for soft bioelectronic systems.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Composites
Changshun Gu, Wenjing Qin, Yanli Wang, Xinxin Li, Jing Wang, Zhenhao Tian, Min Yang, Hanying Qiao, Yutong Wu, Shougen Yin
Summary: This study presents a method of using a breath figure technique to fabricate CNTs/SEBS film with porous microstructure and successfully integrating it onto polyurethane fibers, achieving a high-performance fiber-shaped strain sensor with superior sensitivity and stability.
COMPOSITES COMMUNICATIONS
(2022)
Article
Robotics
Omar Faruk Emon, Hao Sun, Ahadur Rahim, Jae-Won Choi
Summary: A new solid-state force sensor is proposed that can measure both normal and shear forces at the same time. The sensor is made of an ionic liquid/polymer network and uses separate IL-based polymer membranes to detect normal and shear forces. The sensor's performance was optimized by investigating different material compositions for different sensor layers. Results show that the sensor can reliably measure both normal and shear forces, and the sensitivity can be modulated by varying the material composition or geometric configuration.
Article
Engineering, Electrical & Electronic
Fatemeh Nikbakhtnasrabadi, Hatem El Matbouly, Markellos Ntagios, Ravinder Dahiya
Summary: This paper presents a textile-based stretchable microstrip patch antenna with intrinsic strain for e-textiles, which can also function as a strain sensor to measure joint angles with high sensitivity and stretchability.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Engineering, Environmental
Lele Li, Yang Zheng, Enping Liu, Xiaoxin Zhao, Shixiong Yu, Juanjuan Wang, Xue Han, Fan Xu, Yanping Cao, Conghua Lu, Huajian Gao
Summary: This study proposes a new type of strain sensor based on an unexploited bilayer structure. The pre-wrinkled layer guides microcrack formation, leading to effective integration of sensitivity and stretchability. The obtained sensor exhibits high stretchability, unprecedented gauge factor, and fast response.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Multidisciplinary Sciences
Honglie Song, Guoquan Luo, Ziyao Ji, Renheng Bo, Zhaoguo Xue, Dongjia Yan, Fan Zhang, Ke Bai, Jianxing Liu, Xu Cheng, Wenbo Pang, Zhangming Shen, Yihui Zhang
Summary: In this study, a new design strategy utilizing stacked multilayer network materials is proposed to achieve high elastic stretchability and function density for stretchable inorganic electronics. The elastic stretchability of serpentine interconnects is significantly enhanced compared to the use of soft elastomers in previous studies.
Article
Materials Science, Composites
Niu Jiang, Hua Li, Dengwen Hu, Youquan Xu, Yuexin Hu, Yutian Zhu, Xiangyan Han, Guiyan Zhao, Jianwen Chen, Xiaohua Chang, Man Xi, Qiang Yuan
Summary: This study presents a simple route to design multifunctional sensors for strain and temperature sensing by combining the electrospun technique and ultrasonication anchoring technique. The fabricated TPU/IL sensor exhibits fast response time, wide sensing range, and excellent durability for strain sensing, as well as high accuracy for temperature sensing.
COMPOSITES COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Tianliang Li, Qian'ao Wang, Yifei Su, Feng Qiao, Qingfeng Pei, Xiong Li, Yuegang Tan, Zude Zhou
Summary: A stretchable polymer-based sensor has been developed for disease monitoring and telenursing, featuring high tensile strain, durability, waterproofness, and temperature independence. It can be used as a wearable device for real-time monitoring and has shown potential for intelligent healthcare.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Chanho Jeong, Gyan Raj Koirala, Yei Hwan Jung, Yeong Sinn Ye, Jeong Hun Hyun, Tae Hee Kim, Byeonghak Park, Jehyung Ok, Youngmee Jung, Tae-il Kim
Summary: This paper investigates an approach to minimize motion artifact noise in implantable micro-devices that have a specific angle on the body surface, while maintaining sensor functionality. This approach has potential applications in various areas including medical devices, virtual reality, and health aids.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Correction
Engineering, Electrical & Electronic
Yei Hwan Jung, Jae-Young Yoo, Abraham Vazquez-Guardado, Jae-Hwan Kim, Jin-Tae Kim, Haiwen Luan, Minsu Park, Jaeman Lim, Hee-Sup Shin, Chun-Ju Su, Robert Schloen, Jacob Trueb, Raudel Avila, Jan-Kai Chang, Da Som Yang, Yoonseok Park, Hanjun Ryu, Hong-Joon Yoon, Geumbee Lee, Hyoyeong Jeong, Jong Uk Kim, Aadeel Akhtar, Jesse Cornman, Tae-il Kim, Yonggang Huang, John A. Rogers
NATURE ELECTRONICS
(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.
Article
Engineering, Biomedical
Jiwoong Choi, Il Seong Lee, Ju Seung Lee, Sangmin Jeon, Wan Su Yun, Suah Yang, Yujeong Moon, Jinseong Kim, Jeongrae Kim, Seunghwan Choy, Chanho Jeong, Man Kyu Shim, Tae-Il Kim, Kwangmeyung Kim
Summary: This study introduces a promising strategy for cancer immunotherapy, micro-LED guided PDT with mild visible light. The implantable micro-scale light-emitting diode device enables the on-demand activation of photosensitizers deep in the body, enhancing antitumor immunity. The results show that micro-LED guided PDT using mild visible light can promote immunogenic cell death in tumor cells, improve therapeutic efficacy, and boost antitumor immunity. Combining micro-LED guided PDT with immune checkpoint blockade leads to complete tumor regression and establishes systemic immunological memory to prevent tumor recurrence.
BIOMATERIALS RESEARCH
(2022)
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)
