Review
Chemistry, Multidisciplinary
Tomoyuki Yokota, Kenjiro Fukuda, Takao Someya
Summary: Flexible image sensors are gaining attention as new imaging devices due to their lightness, softness, and bendability. They offer high-accuracy continuous biometric information measurement directly attached to curved surfaces like skin, with potential applications in wearable devices and home medical care. The individual components, performance evaluation parameters, and real-world measurement cases of these sensors in the biomedical field are discussed.
ADVANCED MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Young-Geun Park, Insik Yun, Won Gi Chung, Wonjung Park, Dong Ha Lee, Jang-Ung Park
Summary: Recent advances in high-resolution 3D printing technologies have brought significant potential for freeform electronics, allowing for greater complexity and design freedom. A comprehensive review is provided on 3D-printable functional materials, device components, and the latest developments in 3D-printed electronics.
Review
Chemistry, Multidisciplinary
Manpreet Kaur, Tae-Ho Kim, Woo Soo Kim
Summary: Sensing robots are highly desirable in practical settings, but face challenges such as geometric difficulty in sensor positioning and structural complexity. Integrating 3D electronics into 3D printed objects provides a potential solution for designing realistic sensing robot systems.
ADVANCED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Chengjie Jiang, Tianyu Li, Xian Huang, Rui Guo
Summary: This study proposes a simple and rapid method for preparing patterned liquid-metal-enabled universal soft electronics (PLUS-E). The PLUS-E exhibits rapid fabrication, excellent stretchability, and high forming accuracy. The stability of PLUS-E on 3D surfaces is improved by using low-fluidity liquid metal composites. The finite element simulation accurately forecasts the deformation and resistance changes of the PLUS-E and provides guidance for device design. Various sensors developed using this method have demonstrated stable and reliable signal measurements in real-world applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Jihun Cha, Gi-Gwan Kim, Seung Hyun Kim, Dukkyu Park, Jung Il Yoo, Hun Soo Jang, Jongwon Yoon, Heung Cho Ko
Summary: This study presents a technique for developing 3D electronics using planar membrane-type devices and a plastic substrate with internal microfluidic channels. The technique allows for selective plasticization and transformation of the substrate, and the self-closing channels eliminate the need for additional removal processes. The 3D printing process provides design flexibility for creating complex structures. The method enables extreme bending of metal electrodes and thin-film transistors without electrical failure, and a truncated octahedral LED display was successfully developed to demonstrate the feasibility of the technique.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Yue Liu, Huayu Xu, Ming Dong, Renhou Han, Juan Tao, Rongrong Bao, Caofeng Pan
Summary: Flexible electronic equipment has gained increasing attention in recent years and has been widely researched and applied in health monitoring and human-machine interface. This study proposes a high-performance piezoresistive pressure sensor based on PAN nanofiber films and MXene, which exhibits high sensitivity and a wide sensing range, making it suitable for health monitoring and human-machine interface applications.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Bujingda Zheng, Ganggang Zhao, Zheng Yan, Yunchao Xie, Jian Lin
Summary: 3D conformable electronic devices on freeform surfaces have superior performance and have witnessed exponential growth in various applications. However, their potential is limited by a lack of advanced fabrication techniques. To overcome this challenge, a new direct freeform laser fabrication method for directly fabricating 3D conformable electronics on targeted arbitrary surfaces is reported.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
O. Marcelot, A. Panglosse, P. Martin-Gonthier, V Goiffon
Summary: A simple calibration method is proposed for TCAD simulation at cryogenic temperature, focusing on image sensor application. The method uses measurements and simulations of sheet resistances for TCAD calibration and is experimentally verified by extracting pinning voltages on JFETs and a pixel with a pinned photodiode (PPD).
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Engineering, Electrical & Electronic
M. Ntagios, Ravinder Dahiya
Summary: This work presents a soft, flexible, and low-cost capacitive pressure-sensitive insole developed using resource-efficient single-step 3D printing method. The insole exhibits excellent pressure response and sensitivity, making it a promising solution for applications such as gait analysis and robotics.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Hele Guo, Qingyang Fei, Meng Lian, Tianyi Zhu, Wei Fan, Yueming Li, Li Sun, Flip de Jong, Kaibin Chu, Wei Zong, Chao Zhang, Tianxi Liu
Summary: An ultralight and hyperelastic nanofiber-woven hybrid carbon assembly (NWHCA) is fabricated using nanofiber weaving and metallogel-derived quasi-aerogel hybridization. The NWHCA exhibits remarkable resistance to plastic deformation and structural damage under high compression through its 3D lamella-bridge architecture and quasi-aerogel integration. Due to its superelasticity and quasi-aerogel integration, the NWHCA-based zinc-air battery shows excellent electrochemical performance and flexibility. A proof-of-concept integrated device demonstrates the potential of NWHCA in wearable and integrated electronics.
ADVANCED MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Dorota Skowronska, Katarzyna Wilpiszewska
Summary: This paper describes the method of obtaining potato starch nanocomposites plasticized with a deep eutectic solvent, and investigates the effect of montmorillonite addition on the properties of potato starch films. The obtained nanocomposites showed improved mechanical and barrier properties.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Analytical
Tiziano Fapanni, Emilio Sardini, Mauro Serpelloni, Sarah Tonello
Summary: Research focuses on improving the performance of electrochemical sensors, with an innovative approach involving microstructuring to increase the active surface area of electrodes and enhance sensor sensitivity. Aerosol jet printing technology enables the precise deposition of functional inks in patterns, leading to improved sensitivity of the sensors.
Article
Nanoscience & Nanotechnology
Zhou Chen, Shangcheng Kong, Yunhu He, Shenghui Yi, Guo Liu, Zhengyi Mao, Mengke Huo, Chi Hou Chan, Jian Lu
Summary: A solvent-driven bistable actuator is proposed for reconstructing 3D electronic devices, addressing the limitations of existing strategies. The actuator can drive materials to build different 3D structures, achieve multifunctional extensions, and has been applied to electrically small antennas.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Pengfei Zhao, Ruimin Zhang, Yanhong Tong, Xiaoli Zhao, Tao Zhang, Xue Wang, Qingxin Tang, Yichun Liu
Summary: This work fabricates an all-paper, shape-designable, reconfigurable capacitive pressure/proximity sensor using tissue paper as the dielectric and polypyrrole printer paper as the electrode/encapsulation, enabling flexible design of sensors for freely cuttable and foldable 2D and 3D shapes. The sensor demonstrates superior pressure-sensing performance and proximity-sensing ability, with potential applications in omnidirectional perception, stretchable sensors, and green electronics.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Huangzhe Dai, Chengqian Zhang, Chengfeng Pan, Hao Hu, Kaipeng Ji, Haonan Sun, Chenxin Lyu, Daofan Tang, Tiefeng Li, Jianzhong Fu, Peng Zhao
Summary: In this study, a split-type magnetic soft tactile sensor with wireless 3D force sensing and high accuracy is introduced. Inspired by the layered structures of tactile sensory organs, this sensor achieves excellent perception and protection under mechanical contact. With its 3D force decoupling capability and split design, it can be assembled in air and water for delicate robotic operation and water flow-based navigation.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hun Soo Jang, Seonggwang Yoo, Seong Hyeon Kang, Jongjun Park, Gi-Gwan Kim, Heung Cho Ko
ADVANCED FUNCTIONAL MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Gi-Gwan Kim, Yeongmin Kim, Seonggwang Yoo, Hun Soo Jang, Heung Cho Ko
ADVANCED MATERIALS TECHNOLOGIES
(2020)
Article
Chemistry, Multidisciplinary
Donghwi Cho, Rui Li, Hyoyoung Jeong, Shupeng Li, Changsheng Wu, Andreas Tzavelis, Seonggwang Yoo, Sung Soo Kwak, Yonggang Huang, John A. Rogers
Summary: Wireless, skin-integrated devices can greatly improve patient care by continuously monitoring vital signs, but pose a choking hazard for infants. A materials strategy involving composite materials that release bitter compounds to prevent ingestion has been proposed to enhance safety and protect children using these devices.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Sung Soo Kwak, Seonggwang Yoo, Raudel Avila, Ha Uk Chung, Hyoyoung Jeong, Claire Liu, Jamie L. Vogl, Joohee Kim, Hong-Joon Yoon, Yoonseok Park, Hanjun Ryu, Geumbee Lee, Jihye Kim, Jahyun Koo, Yong Suk Oh, Sungbong Kim, Shuai Xu, Zichen Zhao, Zhaoqian Xie, Yonggang Huang, John A. Rogers
Summary: Continuous monitoring of vital signs is crucial for neonatal and pediatric intensive care units, especially for extremely premature and critically ill patients. Optimized materials, open layouts, and precurved designs significantly improve the current sensor platforms, reducing skin injuries, promoting moisture release, and enabling triggered reduction of adhesion to minimize potential harm from device removal. Systematic benchtop testing and computational modeling identify key mechanisms and considerations for continuous, clinical-grade monitoring of conventional vital signs and unconventional health indicators.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Seung-Hyun Mun, Chang-Mo Kang, Jung-Hong Min, Soo-Young Choi, Woo-Lim Jeong, Gi-Gwan Kim, Je-Sung Lee, Kyung-Pil Kim, Heung Cho Ko, Dong-Seon Lee
Summary: Monolithic integration of red, green, and blue inorganic LED thin films on a single substrate using multiple adhesive bonding technique demonstrates structurally stable stacked thin films without the need for mass transfer process. The integrated subpixels can be independently operated with high efficiency and cover a wide range of the color space.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Seonggwang Yoo, Da Som Kim, Woong-Ki Hong, Jung Il Yoo, Fu Huang, Heung Cho Ko, Jung Hee Park, Jongwon Yoon
Summary: The combination of IGZO photo-TFTs with biomaterials enhances UV photoresponse characteristics and improves UV-A absorption while suppressing persistent photoconductivity. The biomaterial/IGZO interface plays a crucial role in achieving fast, repeatable UV monitoring.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Health Care Sciences & Services
Youn J. Kang, Hany M. Arafa, Jae-Young Yoo, Cagla Kantarcigil, Jin-Tae Kim, Hyoyoung Jeong, Seonggwang Yoo, Seyong Oh, Joohee Kim, Changsheng Wu, Andreas Tzavelis, Yunyun Wu, Kyeongha Kwon, Joshua Winograd, Shuai Xu, Bonnie Martin-Harris, John A. Rogers
Summary: This paper introduces a wireless, wearable technology for continuous tracking of respiratory activities and swallows, which can be used for treating dysphagia. Validation studies confirm the measurement equivalency of this technology to existing clinical equipment.
NPJ DIGITAL MEDICINE
(2022)
Article
Multidisciplinary Sciences
Minsu Park, Jae-Young Yoo, Tianyu Yang, Yei Hwan Jung, Abraham Vazquez-Guardado, Shupeng Li, Jae-Hwan Kim, Jaeho Shin, Woo-Youl Maeng, Geumbee Lee, Seonggwang Yoo, Haiwen Luan, Jin-Tae Kim, Hee -Sup Shin, Matthew T. Flavin, Hong -Joon Yoon, Nenad Miljkovic, Yonggang Huang, William P. King, John A. Rogers
Summary: Thermal sensations play a crucial role in our perception of the physical world. Being able to recreate these sensations wirelessly through computer control can enhance virtual experiences in areas beyond video, audio, and haptic inputs. This article presents the development of a skin-integrated technology that generates thermal sensations across the skin with power efficiency and real-time control. The system utilizes passive cooling mechanisms, switchable thermal barrier interfaces, resistive heaters, and flexible electronics with wireless interfaces to portable devices, the internet, and cloud data infrastructure. Experimental studies and simulations guide the design choices, and demonstrations showcase applications in thermoregulation, social interactions, and sensory expansion.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Chemistry, Multidisciplinary
Claire Liu, Jin-Tae Kim, Da Som Yang, Donghwi Cho, Seonggwang Yoo, Surabhi R. Madhvapathy, Hyoyoung Jeong, Tianyu Yang, Haiwen Luan, Raudel Avila, Jihun Park, Yunyun Wu, Kennedy Bryant, Min Cho, JiYong Lee, Jay Young Kwak, WonHyoung Ryu, Yonggang Huang, Ralph G. Nuzzo, John A. Rogers
Summary: Many wireless, skin-interfaced bioelectronic devices use traditional thermoset silicone elastomer materials, such as PDMS, as soft encapsulating structures. However, past studies overlook opportunities to enhance the safety of these devices against various failure modes. This study presents a self-healing PDMS matrix with thermochromism, mechanochromism, strain-adaptive stiffening, and thermal insulation as safety attributes, which can be applied to other bioelectronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jung Il Yoo, Dukkyu Park, Seung Hyun Kim, Seonggwang Yoo, Hun Soo Jang, Jongwon Yoon, Heung Cho Ko
Summary: This study presents a method for transforming planar membrane-type electronic devices into 3D structures with different curvatures using a plastic-elastomer supportive framework. By treating the ABS lines on the framework, reliable interfacial adhesion is ensured. Based on these findings, various 3D structures can be generated and electronic components can also be successfully mounted on the framework.
MATERIALS & DESIGN
(2023)
Article
Multidisciplinary Sciences
Seonggwang Yoo, Tianyu Yang, Minsu Park, Hyoyoung Jeong, Young Joong Lee, Donghwi Cho, Joohee Kim, Sung Soo Kwak, Jaeho Shin, Yoonseok Park, Yue Wang, Nenad Miljkovic, William P. King, John A. Rogers
Summary: This paper introduces an active materials approach to minimize the risk of injury from soft, wireless physiological sensors upon thermal failure. The strategy utilizes thin, flexible bladders containing liquid with higher boiling points than body temperature, which rapidly forms insulating structures and separates the device from the skin when the heat exceeds the safe range.
NATURE COMMUNICATIONS
(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)
Article
Biophysics
Seyong Oh, Jae-Young Yoo, Woo-Youl Maeng, Seonggwang Yoo, Tianyu Yang, Susan M. Slattery, Sara Pessano, Emily Chang, Hyoyoung Jeong, Jihye Kim, Hak-Young Ahn, Yeongdo Kim, Joohee Kim, Shuai Xu, Debra E. Weese-Mayer, John A. Rogers
Summary: Temperature is a vital sign that is widely used in clinical medicine for various care decisions. The traditional methods of assessing body temperature can be challenging, especially for vulnerable patient populations. A simple, miniaturized, lightweight sensor is introduced as a wireless alternative to address these challenges and provide accurate temperature measurements in demanding applications such as neonatal care.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Biochemistry & Molecular Biology
Jae-Young Yoo, Seyong Oh, Wissam Shalish, Woo-Youl Maeng, Emily Cerier, Emily Jeanne, Myung-Kun Chung, Shasha Lv, Yunyun Wu, Seonggwang Yoo, Andreas Tzavelis, Jacob Trueb, Minsu Park, Hyoyoung Jeong, Efe Okunzuwa, Slobodanka Smilkova, Gyeongwu Kim, Junha Kim, Gooyoon Chung, Yoonseok Park, Anthony Banks, Shuai Xu, Guilherme M. Sant'Anna, Debra E. Weese-Mayer, Ankit Bharat, John A. Rogers
Summary: This study presents a wireless, broadband acousto-mechanical sensing network for continuous monitoring of physiological signals in the human body. The system provides clinical-grade accuracy and can be used in both clinical and nonclinical settings.