Hu Jie, Ren Penggang, Zhu Guanjun, Yang Junjun, Li Yanhao, Zong Ze, Sun Zhenfeng
The Faculty of Printing, Packaging Engineering and Digital Media Technology, Xi'an University of Technology, Xi'an, 710048, P. R. China.
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, P. R. China.
Macromol Rapid Commun. 2022 Oct;43(20):e2200372. doi: 10.1002/marc.202200372. Epub 2022 Jul 14.
Flexible strain sensors have attracted intense interest due to their application as intelligent wearable electronic devices. However, it is still a huge challenge to achieve a flexible sensor with simultaneous high sensitivity, excellent durability, and a wide sensing region. In this work, a crack-based strain sensor with a paired-serpentine conductive network is fabricated onto flexible film by screen printing. The innovative conductive network exhibits a controlled crack morphology during stretching, which endows the prepared sensor with outstanding sensing characteristics, including high sensitivity (gauge factor up to 2391.5), wide detection (rang up to 132%), low strain detection limit, a fast response time (about 40 ms), as well as excellent durability (more than 2000 stretching/releasing cycles). Benefiting from these excellent performances, full-range human body motions including subtle physiological signals and large motions are accurately detected by the prepared sensor. Furthermore, wearable electronic equipment integrated with a wireless transmitter and the prepared strain sensor shows great potential for remote motion monitoring and intelligent mobile diagnosis for humans. This work provides an effective strategy for the fabrication of novel strain sensors with highly comprehensive performance.
柔性应变传感器因其作为智能可穿戴电子设备的应用而备受关注。然而，要实现一种同时具有高灵敏度、出色耐久性和宽传感区域的柔性传感器仍然是一个巨大的挑战。在这项工作中，通过丝网印刷在柔性薄膜上制备了一种具有成对蛇形导电网络的基于裂纹的应变传感器。这种创新的导电网络在拉伸过程中呈现出可控的裂纹形态，这赋予了所制备的传感器出色的传感特性，包括高灵敏度（应变片系数高达2391.5）、宽检测范围（高达132%）、低应变检测限、快速响应时间（约40毫秒）以及出色的耐久性（超过2000次拉伸/释放循环）。得益于这些优异性能，所制备的传感器能够准确检测包括细微生理信号和大幅度动作在内的全范围人体运动。此外，集成了无线发射器和所制备应变传感器的可穿戴电子设备在人体远程运动监测和智能移动诊断方面显示出巨大潜力。这项工作为制备具有高度综合性能的新型应变传感器提供了一种有效策略。
