Twisted Conductive Fiber-Based Strain Sensor with High Sensitivity and Wide Working Range for Human Motion Recognition and Physiological Activity Monitoring
Year: 2025
Type: article
Abstract: A strain sensor with high sensitivity and wide working range is urgently required owing to its potential applications in wearable electronic devices. Nevertheless, high sensitivity mainly including high gauge factor (GF) and low detection limit requires a noticeable structural variation even at a tiny deformation, while wide working range requires to remain morphological integrity under a large strain. The contradictory performances lead to a huge challenge to simultaneously acquire the above-mentioned comprehensive performance. Herein, we prepared a twisted fiber-based strain sensor (TFSS) composed of thermoplastic polyurethane (TPU)/silver nanoparticles (AgNPs) fiber and TPU/carbon nanotube (CNT) fiber. The special twisting structure and the synergistic effect of the different conductive materials endow TFSS with high GF of 1.05×105 for a strain of 250%~300%, ultra-low detection limit (0.02% strain), large detection range (up to 300% strain), short response time (60 ms) and excellent sensing stability and durability (4000 stretching/releasing cycles under 50% strain). Moreover, the strain sensor can be used for diverse human movement recognition, micro-expression detection, pulse/breath monitoring and speech recognition, offering a promising strategy for designing high-performance and smart wearable devices.
Authors: Leyu Dai, Leyu Dai, Zhichao Zhou, Yingjie Chang, Zhaoxuan Liu, Jun Sun, Chuanxiang Qin, Jianjun Wang, Lixing Dai, Lixing Dai
Institution: Soochow University
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4415296011