National Engineering Lab for TFT-LCD Materials and Technologies, Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Sensors (Basel). 2021 Sep 10;21(18):6078. doi: 10.3390/s21186078.
A flexible strain sensor which integrates both pressure sensing and tension sensing functions is demonstrated with an active layer comprising of polydimethy-lsiloxane (PDMS) elastomer, liquid crystal (LC), and multi-walled carbon nanotubes (MWCNTs). The introduction of LC improves the agglomeration of MWCNTs in PDMS and decreases Young's modulus of flexible resistive sensors. The tension/pressure integrated resistive sensor not only shows a broad tensile sensing range of 140% strain but also shows a good sensitivity of the gauge factor, 40, with tensile force. Besides, the tension/pressure integrated resistive sensor also shows good linearity and sensitivity under pressure. The resistance of the pressure sensor increases as the applied pressure increases because of the decrease in the cross-sectional area of the path. The sensor also shows good hydrophobic properties which may help it to work under complex environment. The tension/pressure integrated sensor shows great promising applications in electronic skins and wearable devices.
一种集压力传感和张力传感功能于一体的柔性应变传感器，其有源层由聚二甲基硅氧烷（PDMS）弹性体、液晶（LC）和多壁碳纳米管（MWCNTs）组成。LC 的引入改善了 MWCNTs 在 PDMS 中的团聚，降低了柔性电阻传感器的杨氏模量。张力/压力集成电阻传感器不仅在 140%的大拉伸应变范围内表现出良好的拉伸传感性能，而且在拉伸力下还表现出良好的应变灵敏系数 40。此外，张力/压力集成电阻传感器在压力下也表现出良好的线性和灵敏度。由于路径的横截面积减小，压力传感器的电阻随着所施加的压力的增加而增加。该传感器还具有良好的疏水性，这可能有助于它在复杂环境下工作。张力/压力集成传感器在电子皮肤和可穿戴设备中有很好的应用前景。
