Wang Yinli, Shuang Yi, Kim Mihyeon, Ando Daisuke, Narita Fumio, Sutou Yuji
Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba-yama, Sendai, 980-8579, Japan.
WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan.
Mater Horiz. 2024 Nov 11;11(22):5631-5640. doi: 10.1039/d4mh00616j.
To realize a wearable health monitoring system, a piezoresistive material capable of detecting very small mechanical strains is needed. In this study, an amorphous CrGeTe thin film was deposited on a polyimide film by sputtering, and the piezoresistive properties were investigated. In experiments, the CrGeTe/polyimide double-layer foil exhibited an outstanding piezoresistive performance as evidenced by the appearance of self-healing cracks during tensile tests and a remarkably large gauge factor of 60 000 in resistance change measurements. Owing to the self-healing character of cracks, the resistance change is repeatable within a specific strain range. Noteworthily, the double-layer foil is simple to prepare and does not require heat treatment. Furthermore, this double-layer foil was used to fabricate a pressure sensor comprising an extremely simple electrical circuit, and it was deployed on the wrist to monitor the artery pulse signal. As a result, the pressure sensor accurately detected artery pulse waves containing large amounts of information.
为实现可穿戴健康监测系统，需要一种能够检测非常小的机械应变的压阻材料。在本研究中，通过溅射在聚酰亚胺薄膜上沉积了非晶CrGeTe薄膜，并对其压阻特性进行了研究。在实验中，CrGeTe/聚酰亚胺双层箔表现出出色的压阻性能，拉伸试验中出现的自愈合裂纹以及电阻变化测量中高达60000的显著大应变系数证明了这一点。由于裂纹的自愈合特性，电阻变化在特定应变范围内是可重复的。值得注意的是，双层箔制备简单，无需热处理。此外，这种双层箔被用于制造一个包含极其简单电路的压力传感器，并将其部署在手腕上以监测动脉脉搏信号。结果，该压力传感器准确地检测到了包含大量信息的动脉脉搏波。
