Biocompatible and Highly Stretchable PVA/AgNWs Hydrogel Strain Sensors for Human Motion Detection,Advanced Materials Technologies

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Biocompatible and Highly Stretchable PVA/AgNWs Hydrogel Strain Sensors for Human Motion Detection
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-09-06 , DOI: 10.1002/admt.202000426
Shohreh Azadi ₁ , Shuhua Peng ₂ , Sajad A. Moshizi ₁ , Mohsen Asadnia ₁ , Jiangtao Xu ₃ , Inkyu Park ₄ , Chun H. Wang ₂ , Shuying Wu _{1,

2}

Affiliation

Hydrogel‐based strain sensors have attracted considerable interest for applications such as skin‐like electronics for human motion detection, soft robotics, and human–machine interfaces. However, fabrication of hydrogel strain sensors with desirable mechanical and piezoresistive properties is still challenging. Herein, a biocompatible hydrogel sensor is presented, which is made of polyvinyl alcohol (PVA) nanocomposite with high stretchability up to 500% strain, high mechanical strength of 900 kPa, and electrical conductivity (1.85 S m^‐1) comparable to human skin. The hydrogel sensors demonstrate excellent linearity in the whole detection range and great durability under cyclic loading with low hysteresis of 7%. These excellent properties are believed to be contributed by a new bilayer structural design, i.e., a thin, conductive hybrid layer of PVA/silver nanowires (AgNWs) deposited on a pure strong PVA substrate. PVA solution of high concentration is used to fabricate the substrate while the top layer consists of dilute PVA solution so that high content of AgNWs can be dispersed to achieve high electrical conductivity. Together with a rapid response time (0.32 s) and biocompatibility, this new sensor offers great potential as a wearable sensor for epidermal sensing applications, e.g., detecting human joint and muscle movements.

中文翻译：

具有生物相容性和高度可拉伸性的PVA / AgNWs水凝胶应变传感器，用于人体运动检测

基于水凝胶的应变传感器对于诸如人体运动检测的皮肤电子设备，软机器人以及人机界面等应用引起了极大的兴趣。然而，制造具有期望的机械和压阻特性的水凝胶应变传感器仍然具有挑战性。本文介绍了一种生物相容性水凝胶传感器，该传感器由聚乙烯醇（PVA）纳米复合材料制成，具有高达500％应变的高拉伸性，900 kPa的高机械强度以及导电率（1.85 S m ^-1）可与人体皮肤媲美。水凝胶传感器在整个检测范围内都具有出色的线性度，并且在循环负载下具有7％的低滞后性，具有出色的耐久性。据信，这些优异的性能是由新的双层结构设计所促成的，即在纯净的PVA基板上沉积的PVA /银纳米线（AgNW）的薄导电混合层。高浓度的PVA溶液用于制造基板，而顶层由稀的PVA溶液组成，因此可以分散高含量的AgNWs以实现高电导率。这种新的传感器具有快速的响应时间（0.32 s）和生物相容性，作为表皮传感应用（例如检测人体关节和肌肉运动）的可穿戴传感器具有巨大的潜力。

更新日期：2020-11-12

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