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High-Fidelity, Low-Hysteresis Bionic Flexible Strain Sensors for Soft Machines

2024; American Chemical Society; Volume: 18; Issue: 3 Linguagem: Inglês

10.1021/acsnano.3c11711

1936-086X

Jianhao Li, Zhongwen Yao, Xiancun Meng, Xiangxiang Zhang, Ze Wang, Jingxiang Wang, Guoliang Ma, Linpeng Liu, Junqiu Zhang, Shichao Niu, Zhiwu Han, Luquan Ren,

Conducting polymers and applications

Stretchable flexible strain sensors based on conductive elastomers are rapidly emerging as a highly promising candidate for popular wearable flexible electronic and soft-mechanical sensing devices. However, due to the intrinsic limitations of low fidelity and high hysteresis, existing flexible strain sensors are unable to exploit their full application potential. Herein, a design strategy for a successive three-dimensional crack conductive network is proposed to cope with the uncoordinated variation of the output resistance signal arising from the conductive elastomer. The electrical characteristics of the sensor are dominated by the successive crack conductive network through a greater resistance variation and a concise sensing mechanism. As a result, the developed elastomer bionic strain sensors exhibit excellent sensing performance in terms of a smaller overshoot response, a lower hysteresis (∼2.9%), and an ultralow detection limit (0.00179%). What's more, the proposed strategy is universal and applicable to many conductive elastomers with different conductive fillers (including 0-D, 1-D, and 2-D conductive fillers). This approach improves the sensing signal accuracy and reliability of conductive elastomer strain sensors and holds promising potential for various applications in the fields of e-skin and soft robotic systems.