2D PtSe<sub>2</sub> Enabled Wireless Wearable Gas Monitoring Circuits with Distinctive Strain-Enhanced Performance
Zhehan Wang, Xu Jing, Shengshun Duan, Chang Liu, Dingxuan Kang, Xiao Xu, Jiayi Chen, Yier Xia, Bo Chang, Chengdong Zhao, Beibei Zhu, Tao Xu, Huiwen Lin, Weibing Lu, Yuan Ren, Litao Sun, Jun Wu, Li Tao
Abstract
The application of 2D materials-based flexible electronics in wearable scenarios is limited due to performance degradation under strain fields. In contrast to its negative role in existing transistors or sensors, herein, we discover a positive effect of strain to the ammonia detection in 2D PtSe 2 . Linear modulation of sensitivity is achieved in flexible 2D PtSe 2 sensors via a customized probe station with an in situ strain loading apparatus. For trace ammonia absorption, a 300% enhancement in room-temperature sensitivity (31.67% ppm –1 ) and an ultralow limit of detection (50 ppb) are observed under 1/4 mm –1 curvature strain. We identify three types of strain-sensitive adsorption sites in layered PtSe 2 and pinpoint that basal-plane lattice distortion contributes to better sensing performance resulting from reduced absorption energy and larger charge transfer density. Furthermore, we demonstrate state-of-the-art 2D PtSe 2 -based wireless wearable integrated circuits, which allow real-time gas sensing data acquisition, processing, and transmission through a Bluetooth module to user terminals. The circuits exhibit a wide detection range with a maximum sensitivity value of 0.026 V·ppm –1 and a low energy consumption below 2 mW.