文献类型：期刊文献

英文题名：Highly Sensitive Pressure and Strain Sensors Based on Stretchable and Recoverable Ion-Conductive Physically Cross-Linked Double-Network Hydrogels

作者：Zhou, Linjie[1,2];Wang, Zhenwu[1];Wu, Changsong[3];Cong, Yang[3];Zhang, Rui[2];Fu, Jun[1]

机构：[1]Sun Yat Sen Univ, Sch Mat Sci & Engn, Guangzhou 510275, Peoples R China;[2]East China Univ Sci & Technol, Engn Res Ctr Large Scale Reactor Engn & Technol, Sch Chem Engn, Minist Educ, Shanghai 200237, Peoples R China;[3]Ningbo Univ Technol, Sch Mat Sci & Chem Engn, Ningbo 315211, Peoples R China

年份：2020

卷号：12

期号：46

起止页码：51969

外文期刊名：ACS APPLIED MATERIALS & INTERFACES

收录：;EI(收录号：20204909568994);WOS:【SCI-EXPANDED(收录号:WOS:000592923100083)】；

基金：This study was supported by the National Natural Science Foundation of China (51873224), the National Key Research and Development Program, the Ministry of Science and Technology of China (2016YFC1101902), the Ministry of Industry and Information Technology of China (TC90HZV/1), and the S&T Innovation 2025 Major Program of Ningbo (2018B10040).

语种：英文

外文关键词：double-network hydrogels; physical cross-linking; pressure sensor; strain sensor; ion-conductive hydrogels; recovery; high sensitivity

摘要：Ion-conductive hydrogel sensors have attracted great research interests for applications in wearable devices, electronic skins, and implantable sensors, but most such sensors are fragile, with low conductivity and sensitivity. This study reports on novel ion-conductive double network hydrogels with a cross-linked helical structure, hydrophobic association, and metal-ion coordination. The helical kappa-carrageenan first network and the second network cross-linked by Pluronic F127 diacrylate micelles and tridentate Fe3+-COO- coordination work synergistically to show the tensile strength of 2.7 MPa, fracture strain of 1400%, and tensile toughness of 9.82 MJ m(-3) and fatigue resistance against cyclic loadings with high strains. The hydrogels show an ion conductivity of 1.15 S m(-1), a strain sensitivity of up to 2.8, and a pressure sensitivity of 0.33 kPa(-1). Sensor arrays fabricated from the conductive hydrogels provide an in-plane detection of pressures less than 200 Pa. Such hydrogel sensors have potential applications to electron skins and implantable sensors.