Xie Enhao, Xiao Qi, Fan Wei, Jamshaid Hafsa, Guo Linwen, Wang Weifu
School of Textile Garment & Design, Changshu Institute of Technology, Changshu, Jiangsu 215500, China.
Key Laboratory of Functional Textile Material and Product, Ministry of Education, Xi'an Polytechnic University, Xi'an 710048, China.
ACS Omega. 2025 Mar 25;10(13):13218-13227. doi: 10.1021/acsomega.4c10803. eCollection 2025 Apr 8.
Stretchable strain sensors integrated with supercapacitor functions have drawn significant attention due to their wide potential applications. In this study, a composite fiber with a core-shell structure is fabricated via a coaxial wet spinning method to enhance the comprehensive properties. The fiber uses thermoplastic polyurethane (TPU) and polypyrrole (PPy) as the shell layer and poly(3,4-ethylenedioxythiophene) (PEDOT) and single-walled carbon nanotubes (SWCNTs) as the core layer. By optimizing the contents of PPy, SWCNTs, and TPU, we obtain stretchable strain sensors with both sensing and electrochemical properties. The results show that when the content of PPy is 1.5%, that of SWCNTs is 0.7%, and that of TPU is 10%, the prepared composite fibers exhibit excellent mechanical and electrochemical properties, a stress of 65.7 MPa, a strain of 374.8%, and a mass-specific capacitance of 759.5 F/g. The strain sensors can accurately recognize human body movements in finger bending cycle tests and exhibit a high gauge factor (76.5, for the stretch range of 40-50%) and stable cyclic tensile response (4000 cycles), which indicates their good strain sensing properties.
集成超级电容器功能的可拉伸应变传感器因其广泛的潜在应用而备受关注。在本研究中，通过同轴湿法纺丝法制备了一种具有核壳结构的复合纤维，以提高其综合性能。该纤维以热塑性聚氨酯（TPU）和聚吡咯（PPy）为壳层，以聚（3,4-乙撑二氧噻吩）（PEDOT）和单壁碳纳米管（SWCNTs）为核层。通过优化PPy、SWCNTs和TPU的含量，我们获得了兼具传感和电化学性能的可拉伸应变传感器。结果表明，当PPy含量为1.5%、SWCNTs含量为0.7%、TPU含量为10%时，制备的复合纤维表现出优异的力学和电化学性能，应力为65.7 MPa，应变率为374.8%，质量比电容为759.5 F/g。该应变传感器在手指弯曲循环测试中能够准确识别人体运动，并表现出高应变系数（在40-50%的拉伸范围内为76.5）和稳定的循环拉伸响应（4000次循环），这表明其具有良好的应变传感性能。
