标度系数
材料科学
压力传感器
自愈水凝胶
复合材料
复合数
应变计
聚乙烯醇
极限抗拉强度
导电体
戊二醛
高分子化学
制作
化学
机械工程
病理
替代医学
工程类
医学
色谱法
作者
Huige Wei,Deshuo Kong,Tuo Li,Qizhou Xue,Shaoyu Wang,Dapeng Cui,Yudong Huang,Li Wang,Sanming Hu,Tong Wan,Guang Yang
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2021-07-30
卷期号:6 (8): 2938-2951
被引量:55
标识
DOI:10.1021/acssensors.1c00699
摘要
A biocompatible, flexible, yet robust conductive composite hydrogel (CCH) for wearable pressure/strain sensors has been achieved by an all-solution-based approach. The CCH is rationally constructed by in situ polymerization of aniline (An) monomers in the polyvinyl alcohol (PVA) matrix, followed by the cross-linking of PVA with glutaraldehyde (GA) as the cross-linker. The unique multiple synergetic networks in the CCH including strong chemical covalent bonds and abundance of weak physical cross-links, i.e., hydrogen bondings and electrostatic interactions, impart excellent mechanical strength (a fracture tensile strength of 1200 kPa), superior compressibility (ε = 80%@400 kPa), outstanding stretchability (a fracture strain of 670%), high sensitivity (0.62 kPa–1 at a pressure range of 0–1.0 kPa for pressure sensing and a gauge factor of 3.4 at a strain range of 0–300% for strain sensing, respectively), and prominent fatigue resistance (1500 cycling). As the flexible wearable sensor, the CCH is able to monitor different types of human motion and diagnostically distinguish speaking. As a proof of concept, a sensing device has been designed for the real-time detection of 2D distribution of weight or pressure, suggesting its promising potentials for electronic skin, human–machine interaction, and soft robot applications.
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