Ding Yuanlong, Cao Jun, Dong Haohao, Zhou Xinghai, Wang Ying, Yan Jun, Li Hong, Yu Yongtao, Fan Jiangning, Fan Yanzhi, Li Dongyan, Liao Yongping
School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, P. R. China.
School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China.
ACS Appl Mater Interfaces. 2024 Jul 3;16(26):34113-34124. doi: 10.1021/acsami.4c05753. Epub 2024 Jun 24.
Developing fabric-based strain sensors with high sensitivity and stability is in high demand for wearable electronics. Herein, carbon nanotubes (CNTs) and polypyrrole (PPy) are coated on a thermoplastic polyurethane (TPU) fabric as strain sensors. A microbridge structure, in which CNT bridges the stretching-induced cracks, has been designed for the TPU-CNT-PPy strain sensor. The microbridge structure can significantly enhance the electrical resilience, ensuring the improved sensitivity and stability of strain sensors. As a result, our TPU-CNT-PPy strain sensors deliver high sensitivity (GF = 231.5) with a broad working range (150%) and fast response and recovery time (166/195 ms). In addition, our TPU-CNT-PPy could also be used as flexible electrodes of the microsupercapacitors (MSCs) as a power supplier for the integrated sensing system. The TPU-CNT-PPy-based MSCs exhibit a high specific capacitance (460.3 mF cm at 0.5 mA cm) and excellent cycling stability (96.69% capacitance retention for 10,000 charge/discharge cycles). Finally, we demonstrated an integrated sensing system using TPU-CNT-PPy as both MSCs and strain sensors, where the current signals of the sensors could be well detected via Bluetooth. This study offers a microbridge strategy to fabricate strain sensors with high sensitivity and stability and develops an integrated sensing system for the actual applications of wearable electronics.
开发具有高灵敏度和稳定性的织物基应变传感器在可穿戴电子产品中具有很高的需求。在此，碳纳米管（CNT）和聚吡咯（PPy）被涂覆在热塑性聚氨酯（TPU）织物上作为应变传感器。为TPU-CNT-PPy应变传感器设计了一种微桥结构，其中CNT桥接拉伸诱导的裂缝。微桥结构可以显著提高电弹性，确保应变传感器的灵敏度和稳定性得到改善。结果，我们的TPU-CNT-PPy应变传感器具有高灵敏度（GF = 231.5）、宽工作范围（150%）以及快速响应和恢复时间（166/195毫秒）。此外，我们的TPU-CNT-PPy还可以用作微型超级电容器（MSC）的柔性电极，为集成传感系统提供电源。基于TPU-CNT-PPy的MSC表现出高比电容（在0.5 mA cm时为460.3 mF cm）和出色的循环稳定性（10000次充放电循环后电容保持率为96.69%）。最后，我们展示了一个使用TPU-CNT-PPy作为MSC和应变传感器的集成传感系统，其中传感器的电流信号可以通过蓝牙很好地检测到。这项研究提供了一种制造具有高灵敏度和稳定性的应变传感器的微桥策略，并开发了一种用于可穿戴电子产品实际应用的集成传感系统。
