Article
Chemistry, Analytical
Mohammad Shamim Reza, Lu Jin, You Jeong Jeong, Tong In Oh, Hongdoo Kim, Kap Jin Kim
Summary: This study aims to find suitable base materials for dry electrode fabrication in order to achieve high accuracy and maintain electrode performance for long-term bioelectric potential monitoring after electroless silver plating. Nanoweb-based chlorinated polyisoprene (CPI) and poly(styrene-b-butadiene-b-styrene) (SBS) rubber were selected as promising candidates due to their excellent elastic properties and nanofibril nature. The electroless silver plating technique was used to coat the nanofiber web, resulting in the fabrication of silver nanoweb (AgNW)-based dry electrodes. Thorough investigations were conducted to evaluate the key electrode properties of AgNW dry electrodes, and human testing showed comparable performance to commercial Ag/AgCl gel electrodes, with superior long-term stability.
Article
Materials Science, Multidisciplinary
Liangye Li, Yunfei Liu, Changying Song, Shunfeng Sheng, Liuyang Yang, Zhijun Yan, Dora Juan Juan Hu, Qizhen Sun
Summary: This study introduces a wearable and alignment-free sensor chip for monitoring vital signs and evaluating cardiovascular health. The device utilizes optical signal perception and an adaptable liquid sac to eliminate alignment errors, allowing for continuous and accurate cardiovascular health monitoring, including before and after exercise.
ADVANCED FIBER MATERIALS
(2022)
Article
Engineering, Biomedical
Akihito Miyamoto, Hiroshi Kawasaki, Sunghoon Lee, Tomoyuki Yokota, Masayuki Amagai, Takao Someya
Summary: A method is reported for continuous monitoring of skin electrical resistance and transepidermal water loss, which can evaluate the barrier function of the skin and reflect the dynamic changes of skin physiology.
ADVANCED HEALTHCARE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Ladan Eskandarian, Amirali Toossi, Farah Nassif, Sahar Golmohammadi Rostami, Siting Ni, Amin Mahnam, Milad Alizadeh Meghrazi, Wataru Takarada, Takeshi Kikutani, Hani E. Naguib
Summary: This paper proposes flexible, breathable, and washable dry textile electrodes made of conductive elastomeric filaments (CEFs) to address the limitations of wearables for continuous monitoring. The CEF electrodes are found to have comparable fidelity to gold standard gel electrodes and are resistant to repeated wash and dry cycles. Smart undergarments with these textile electrodes successfully perform long-term continuous ECG monitoring.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Engineering, Electrical & Electronic
Giacomo Paterniani, Daria Sgreccia, Alessandro Davoli, Giorgio Guerzoni, Pasquale Di Viesti, Anna Chiara Valenti, Marco Vitolo, Giorgio M. Vitetta, Giuseppe Boriani
Summary: In recent years, the use of radar systems in health monitoring has received significant attention due to the availability of low-cost radar devices and computationally efficient signal processing algorithms. This article provides a tutorial overview of radar-based monitoring of vital signs, including an introduction to radar technologies and signal processing algorithms, guidelines for selecting radar devices for vital sign monitoring, and various specific applications and research trends in this field.
PROCEEDINGS OF THE IEEE
(2023)
Article
Engineering, Electrical & Electronic
Salvatore Andrea Pullano, Venkata Deepa Kota, Karthik Kakaraparty, Antonino S. Fiorillo, Ifana Mahbub
Summary: In this paper, an optically unobtrusive dry electrode based on the iono-electric properties of zeolite is developed and proposed for continuous electrocardiogram (ECG) monitoring. The electrical and bio-electrical characterizations are evaluated for different types of electrodes, and the results show that certain parameters lead to the best performance.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Environmental
Lei Meng, Qingjin Fu, Sanwei Hao, Feng Xu, Jun Yang
Summary: The study has successfully developed an epidermal dry electrode with high mechanical performance, low contact impedance, and excellent self-adhesive, which can be used for chronic disease diagnosis and smart health monitoring. The electrode can be detached from the skin by simple water rinsing to reduce skin damage.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Chemistry, Analytical
Hyeonseok Kim, Eugene Kim, Chanyeong Choi, Woon-Hong Yeo
Summary: Electrophysiology signals are crucial in monitoring health status, leading to the development of skin-mounted electrodes. Dry electrodes, compared to wet electrodes, offer advantages such as convenience, stability, and biocompatibility. This review provides a systematic summary of the latest research on high-performance soft and dry electrodes, including advancements in materials, manufacturing methods, and applications in wearable biomedical devices.
Article
Polymer Science
Sujin Cha, Byeolyi Choi, Eugene Lee, Gilsoo Cho
Summary: There is a growing demand for research on flexible transparent electrodes (FTEs) due to their importance in next-generation electronic devices, such as wearable computers. In this study, highly conductive transparent conducting electrodes based on PVDF nanofiber webs treated with PEDOT:PSS and AgNWs were successfully fabricated. The electrical conductivity of the samples improved with increasing AgNW content, but the light transmittance decreased, highlighting the balance between transparency and electrical conductivity in the optimization of TCEs.
Article
Chemistry, Multidisciplinary
Yunhe Zhao, Yang Li, Muhammad Ihsan-ul-haq, Nauman Mubarak, Mengyang Xu, Xianying Qin, Tian-Shou Zhao, Jang-Kyo Kim
Summary: The electrochemical performance of carbon nanofiber electrodes in vanadium redox flow batteries can be enhanced by optimizing their morphological and physical properties. This can be achieved by modifying the precursor composition and carbonization temperature, resulting in tailored surface area, porosity, and electrical conductivity. The optimized carbon nanofibers exhibit high wettability and activity, leading to improved electrochemical performance in vanadium redox flow batteries.
Article
Biochemistry & Molecular Biology
Doudou Ning, Zhaoqing Lu, Cuiyu Tian, Ning Yan, Fan Xie, Nan Li, Li Hua
Summary: In this study, a superwettable deacetylated cellulose acetate (d-CA)-based electrospinning nanofibers membrane was prepared by simply dipping it in bacterial cellulose (BC) and crosslinking it with citric acid (CCA), resulting in the formation of a spider-web structure. Compared to the pristine d-CA membrane, the dCA/BC@CCA membrane exhibited significantly improved oil/water separation performance, with higher flux and separation efficiency, as well as excellent mechanical properties, cycle stability, and durability.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Materials Science, Multidisciplinary
Xiuzhu Lin, Yu Bing, Fan Li, Haixia Mei, Sen Liu, Teng Fei, Hongran Zhao, Tong Zhang
Summary: This study presents a breathable and lightweight all-nanofiber piezoresistive sensor for real-time monitoring of physiological signals. The sensor is composed of three layers of electrospun nanofibers and utilizes a specific interpenetrating network of conductive and insulating nanofibers to enhance sensitivity. The sensor has excellent breathability and heat dissipation, ensuring comfort and stability during long-term wearing. It also demonstrates potential applications in spatial pressure detection.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Review
Nanoscience & Nanotechnology
Qing Liu, Jie Zhou, Qi Zeng, Dexin Sun, Bin Yu, Liangtao Yang, Zhilin Zhang, Jinglong Wu, Yi Zhang
Summary: In this study, one-dimensional platinum-coated AgNWs/PDMS flexible electrodes were prepared using a simple displacement reaction and spin-coating process. The electrodes showed comparable electrical conductivity, stability, and flexibility to pure AgNWs/PDMS electrodes. The low contact impedance of the Pt-AgNWs/PDMS electrodes facilitated the capture of various physiological signals, making them suitable for stable long-term recording.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Chen-Xi Bi, Kai-Qi Jin, Jing Yan, Yu Qin, Feng Hong, Wei-Hua Huang, Yan-Ling Liu
Summary: Researchers have developed a stretchable electrochemical sensor by electrospinning aligned and elastic polyurethane nanofibers on a PDMS film and modifying it with a conductive polymer. The sensor can guide the oriented growth of smooth muscle cells and maintain their contractile phenotype, while exhibiting good electrochemical sensing performance and stability under mechanical deformation. By culturing cells on the sensor surface, the oriented growth of smooth muscle cells and real-time monitoring of stretch-induced H2O2 release can be achieved. This allows for quantitative monitoring of changes in H2O2 levels released by smooth muscle cells under hypertensive conditions and intervention with the natural product resveratrol, providing insights into vascular-related diseases and pharmaceutical intervention mechanisms.
Article
Nanoscience & Nanotechnology
Kun Huang, Junchen Liu, Sen Lin, Yufeng Wu, Enfu Chen, Zhaofeng He, Ming Lei
Summary: The newly developed AgPHPUS ECG electrode has a unique structure, with good flexibility and stability, accurately collecting ECG signals during long-term and repeated use.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Materials Science, Textiles
Ruthirapathi Tamil Selvan, Yu Jin Ahn, Kap Jin Kim, Hongdoo Kim
FIBERS AND POLYMERS
(2017)
Article
Chemistry, Analytical
D. Manjula Dhevi, A. Anand Prabu, Kap Jin Kim
VIBRATIONAL SPECTROSCOPY
(2018)
Article
Materials Science, Textiles
Mohammad Shamim Reza, Kevin Ray Ayag, Mi Kyong Yoo, Kap Jin Kim, Hongdoo Kim
FIBERS AND POLYMERS
(2019)
Article
Polymer Science
Ponnan Sathiyanathan, Dhevagoti Manjula Dhevi, Arun Anand Prabu, Kap Jin Kim
MACROMOLECULAR RESEARCH
(2019)
Article
Engineering, Electrical & Electronic
You Jeong Jeong, Young Eun Kim, Kap Jin Kim, Eung Je Woo, Tong In Oh
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2020)
Article
Materials Science, Textiles
Hang-Won Cho, Hyun-Jin Koo, Hongdoo Kim, Kap-Jin Kim
FIBERS AND POLYMERS
(2020)
Article
Materials Science, Textiles
Mohammad Shamim Reza, Kap Jin Kim, Hongdoo Kim
FIBERS AND POLYMERS
(2020)
Article
Polymer Science
Shamim-Ara Pervin, Ponnan Sathiyanathan, Arun Anand Prabu, Kap Jin Kim
Summary: Electrospun PVDF/sPPS blend nanofiber webs were prepared to investigate the changes in piezoelectric behavior of PVDF with varying sPPS content. The results showed that the addition of sPPS significantly increased the beta-crystalline absorbance of PVDF, improving the performance of the piezoelectric sensor.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Ponnan Sathiyanathan, Lixin Wu, Thomas Walter Schmidt, Tianyuan Li, Gunasekaran Harini Bhuvaneswari, Hongdoo Kim, Arun Anand Prabu, Kap Jin Kim
Summary: This study investigated the changes in beta-crystalline phase in nanofibers using varying content of sulfonated Poly(phenylidene sulfide) as a filler. Among the different samples, the 5 wt.-% sulfonated Poly(phenylidene sulfide) content exhibited the maximum increase in beta-crystallinity, showing a nucleating effect in the nanofibers.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Materials Science, Textiles
Mir Muhammad Fahad, Mohammad Shamim Reza, Gajula Prasad, Sellamuthu N. Jaisankar, Kap Jin Kim, Hongdoo Kim
Summary: In this research, triboelectric sensors were fabricated using different materials, and the results showed that nonwoven TPU generated larger triboelectric voltages compared to electrospun TPU nanoweb, possibly due to its higher roughness. The sensors were also able to accurately measure physiological vital signs and movements of a human, such as heartbeat and respiration, and detect apneic events and body movements.
FIBERS AND POLYMERS
(2022)
Article
Materials Science, Textiles
Shamim-Ara Pervin, Arun Anand Prabu, Kap Jin Kim
Summary: Soluble sulfonated poly(1,4-phenylene sulfide) (sPPS) was synthesized and characterized using various methods. Melt-polymerized PPS samples were found to have approximately twice the degree of branching compared to solution-polymerized PPS samples.
FIBERS AND POLYMERS
(2022)
Article
Engineering, Electrical & Electronic
Prasad Gajula, Fahad Mir Muhammad, Mohammad Shamim Reza, Sellamuthu N. Jaisankar, Kap Jin Kim, Hongdoo Kim
Summary: Nowadays, flexible triboelectric sensors are the most promising candidates for wearable energy harvesting and medical applications. Self-powered flexible triboelectric sensors (SF-TESs) were fabricated using roughness-created Ecoflex cast film and melt-blown nonwoven polyurethane layers. By adding a spacer, the SF-TES showed improved triboelectric performance with higher VOC and power density values.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Analytical
Mohammad Shamim Reza, Lu Jin, You Jeong Jeong, Tong In Oh, Hongdoo Kim, Kap Jin Kim
Summary: This study aims to find suitable base materials for dry electrode fabrication in order to achieve high accuracy and maintain electrode performance for long-term bioelectric potential monitoring after electroless silver plating. Nanoweb-based chlorinated polyisoprene (CPI) and poly(styrene-b-butadiene-b-styrene) (SBS) rubber were selected as promising candidates due to their excellent elastic properties and nanofibril nature. The electroless silver plating technique was used to coat the nanofiber web, resulting in the fabrication of silver nanoweb (AgNW)-based dry electrodes. Thorough investigations were conducted to evaluate the key electrode properties of AgNW dry electrodes, and human testing showed comparable performance to commercial Ag/AgCl gel electrodes, with superior long-term stability.
Article
Engineering, Electrical & Electronic
Lu Jin, Zhenhong Li, Zekun Liu, Bethany Richardson, Yan Zheng, Lulu Xu, Zhongda Chen, Heng Zhai, Hongdoo Kim, Qingwen Song, Pengfei Yue, Sheng Quan Xie, Kap Jin Kim, Yi Li
Summary: This paper introduces a novel strategy involving unimodal tension, bend, shear, and twist strain sensors for detecting and differentiating individual strain modes in complex motions, potentially revolutionizing the development of motion recognition and control systems.
NPJ FLEXIBLE ELECTRONICS
(2022)
Proceedings Paper
Biophysics
Y. J. Jeong, T. I. Oh, E. J. Woo, K. J. Kim
2017 39TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC)
(2017)