Lu Wenzhong, Zhang Qixiang, Liu Nishuang, Lei Dandan, Ren Ziqi, Yin Jianyu, Jia Peixue, Gao Yihua
School of Physics and Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), Wuhan, 430074, P. R. China.
Small. 2024 Mar;20(10):e2306463. doi: 10.1002/smll.202306463. Epub 2023 Oct 29.
Flexible humidity sensors have received more and more attention in people's lives, and the problems of gas permeability and power supply issues of the device have long been areas in need of improvement. In this work, inspired by the high air permeability of daily wear clothing and galvanic batteries, a self-powered humidity sensor with high air permeability and fast response is designed. A nylon fabric/GO net (as a humidity sensitive layer and solid electrolyte) is obtained by spraying technique. This structure enables the sensor to have fast response/recovery (0.78 s/0.93 s, calculated at 90% of the final value), ultra-high response (0.83 V) and excellent stability (over 150 cycles) at 35 °C. Such sensors are useful for health monitoring, such as non-contact monitoring of human respiratory rate before and after exercise, and monitoring a level of humidity in the palms, arms, and fingers. This research provides an idea for developing a flexible wearable humidity sensor that is both breathable and self-powered and can also be mass-produced similar to wearable clothing.
柔性湿度传感器在人们的生活中受到越来越多的关注，而该器件的透气性和供电问题长期以来一直是需要改进的方面。在这项工作中，受日常穿着衣物的高透气性和原电池的启发，设计了一种具有高透气性和快速响应的自供电湿度传感器。通过喷涂技术获得了尼龙织物/氧化石墨烯网（作为湿度敏感层和固体电解质）。这种结构使传感器在35℃时具有快速响应/恢复（0.78秒/0.93秒，按最终值的90%计算）、超高响应（0.83伏）和出色的稳定性（超过150个循环）。此类传感器可用于健康监测，如运动前后对人体呼吸频率的非接触监测，以及对手掌、手臂和手指湿度水平的监测。这项研究为开发一种兼具透气性和自供电功能、且能像可穿戴衣物一样进行大规模生产的柔性可穿戴湿度传感器提供了思路。
