材料科学
标度系数
耐久性
碳纳米管
复合材料
双层
磁滞
胶粘剂
线性
拉伤
灵敏度(控制系统)
弯曲
图层(电子)
制作
膜
内科学
工程类
病理
物理
生物
医学
替代医学
量子力学
遗传学
电子工程
作者
Dongdong Mai,Jiaheng Mo,Shijie Shan,Yaling Lin,Anqiang Zhang
标识
DOI:10.1021/acsami.1c12438
摘要
Strain sensors with high sensitivity, long-term durability, and stretchability are required for flexible and wearable electronic devices. This paper reports a bilayer strain sensor consisting of carboxyl-functionalized carbon nanotubes (CNTs) and ionically crosslinked polysiloxane substrates based on unsaturated acid-amine interactions. Vacuum filtration was adopted to prepare the CNT films (2.74-4.70 μm in thickness) onto the polysiloxane substrates to prepare stretchable conductive strain sensors. The strain sensor exhibited self-healing ability, self-adhesiveness, high sensitivity, linearity, low hysteresis, and long-term durability with a gauge factor of 33.99 at 55% strain. The sensitivity and linearity could be adjusted by the thickness of the CNT layer. A crack-related mechanism was proposed in which increasing the thickness of the CNT layer led to simultaneously enhanced sensitivity and linearity. Finally, we investigated the detection of human activities (bending/unbending of fingers or knees) and subtle motions (coughing and swallowing). The fabricated strain sensor succeeded in meeting various needs with satisfactory sensing performance.
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