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Title: Scaling Metal-Elastomer Composites toward Stretchable Multi-Helical Conductive Paths for Robust Responsive Wearable Health Devices
Authors: Zhao, Yue
Tan, Yu Jun 
Yang, Weidong 
Ling, Shaohua
Yang, Zijie 
Teo, Ju Teng
See, Hian Hian
Lee, David Kwok Hung 
Lu, Dingjie
Li, Shihao
Zeng, Xianting
Liu, Zhuangjian 
Tee, Benjamin CK 
Keywords: Science & Technology
Engineering, Biomedical
Nanoscience & Nanotechnology
Materials Science, Biomaterials
Science & Technology - Other Topics
Materials Science
finite element analysis
health monitoring
metal-elastomer composites
stretchable conductors
Issue Date: 17-Jul-2021
Publisher: WILEY
Citation: Zhao, Yue, Tan, Yu Jun, Yang, Weidong, Ling, Shaohua, Yang, Zijie, Teo, Ju Teng, See, Hian Hian, Lee, David Kwok Hung, Lu, Dingjie, Li, Shihao, Zeng, Xianting, Liu, Zhuangjian, Tee, Benjamin CK (2021-07-17). Scaling Metal-Elastomer Composites toward Stretchable Multi-Helical Conductive Paths for Robust Responsive Wearable Health Devices. ADVANCED HEALTHCARE MATERIALS 10 (17). ScholarBank@NUS Repository.
Abstract: Stretchable electronics have advanced rapidly and many applications require high repeatability and robustness under various mechanical deformations. It has been described here that how a highly stretchable and reliable conductor composite made from helical copper wires and a soft elastomer, named eHelix, can provide mechanically robust and strain-insensitive electronic conductivity for wearable devices. The reversibility of the mechanical behavior of the metal-elastomer system has been studied using finite element modeling methods. Optimal design parameters of such helical metal-elastomer structures are found. The scaling of multiple copper wires into such helical shapes to form a Multi-eHelix system is further shown. With the same elastomer volume, Multi-eHelix has more conductive paths and a higher current density than the single-eHelix. Integrations of these eHelix stretchable conductors with fabrics showed wearable displays that can survive machine-washes and hundreds of mechanical loading cycles. The integration of the eHelix developed by us with a wearable optical heart rate sensor enabled a wearable health monitoring system that can display measured heart rates on clothing. Furthermore, Multi-eHelix conductors are used to connect flexible printed circuit boards and piezoresistive sensors on a tactile sensing glove for the emerging sensorized prosthetics.
ISSN: 21922640
DOI: 10.1002/adhm.202100221
Appears in Collections:Staff Publications

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