Humidity‐Powered Flexible Sensors Based on Hygroscopic Groove‐Structured Fabric for Real‐Time Health Monitoring
Changling Miao, Shaodong Zhang, Xiangyu Li, Hanyu Guo, Yajuan Chen, Shanshan Gong, Mengfan Zhang, Dong Liu, Yanping Liu, Xueping ZhangABSTRACT
The significance of real‐time humidity monitoring for personal health management has spurred substantial research into wearable sensors. However, their development faces a critical challenge in power supply. While moisture‐triggered chemoelectric conversion offers a self‐powering solution, its performance is often compromised by electrolyte instability. Herein, we developed a unique groove‐structured fabric electrolyte that is rich in hydrophilic groups, enabling sensitive humidity response. This intrinsic hygroscopicity ensures stable performance over long‐term use. A full‐fabric chemoelectric humidity sensor (FCEHS) was fabricated by simply sewing the as‐prepared fabric electrolyte between a metal‐electrodeposited fabric anode and a carbon cloth cathode. The open‐circuit voltage of the FCEHS can be regulated by changing the ambient humidity, thereby enabling self‐powered humidity sensing. Owing to its excellent breathability and conformability, the device demonstrated a rapid response/recovery time of 0.8/2.3 s and delivered a stable output voltage of 0–1.2 V over a broad RH range of 0%–98%, reaching up to 1.3 V under wet conditions. Moreover, the all‐fabric design offers excellent cleanability and extended storage stability, while demonstrating high tolerance to mechanical deformation and temperature variations. We further constructed real‐time monitoring interfaces using the FCEHS, achieving effective motion state assessments and respiratory monitoring.