材料科学
标度系数
电子皮肤
电容感应
纳米技术
压力传感器
电极
电容
复合材料
石墨烯
生物医学工程
计算机科学
制作
机械工程
操作系统
工程类
病理
物理化学
化学
医学
替代医学
作者
Xiaoyun Bi,Manzhao Yao,Zhaoyan Huang,Zuhao Wang,Huahao Shen,Ching‐Ping Wong,Can Jiang
标识
DOI:10.1021/acsami.4c01899
摘要
Electronic skin (e-skin) is showing a huge potential in human–computer interaction, intelligent robots, human health, motion monitoring, etc. However, it is still challenging for e-skin to realize distinguishable detection of stretching strain, vertical pressure, and temperature through a simple noncoupling structure design. Here, a stretchable multimodal biomimetic e-skin was fabricated by integrating layer-by-layer self-assembled crumpled reduced graphene oxide/multiwalled carbon nanotubes film on natural rubber (RGO/MWCNTs@NR) as stretchable conductive electrodes and polyacrylamide/NaCl ionogel as a dielectric layer into an ionotropic capacitive mechanoreceptor. Unlike natural skin receptors, the sandwich-like stretchable ionogel mechanoreceptor possessed a distinct ionotropic capacitive behavior for strain and pressure detection. The results showed that the biomimetic e-skin displayed a negative capacitance change with superior stretchability (0–300%) and a high gauge factor of 0.27 in 180–300% strain, while exhibiting a normal positive piezo-capacitance behavior in vertical pressure range of 0–15 kPa with a maximal sensitivity of 1.759 kPa–1. Based on this feature, the biomimetic e-skin showed an excellent synchronous detection capability of planar strain and vertical pressure in practical wearable applications such as gesture recognition and grasping movement detection without a complicated mathematical or signal decoupling process. In addition, the biomimetic e-skin exhibited a quantifiable linear responsiveness to temperature from 20–90 °C with a temperature coefficient of 0.55%/°C. These intriguing properties gave the biomimetic e-skin the ability to perform a complete function similar to natural skin but beyond its performance for future wearable devices and artificial intelligence devices.
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