Humidity-sensitive chemoelectric flexible sensors based on metal-air redox reaction for health management

Shuo Li, Yong Zhang, Xiaoping Liang, Haomin Wang, Haojie Lu, Mengjia Zhu, Huimin Wang, Mingchao Zhang, Xinping Qiu, Yafeng Song and Yingying Zhang ()
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Shuo Li: Tsinghua University
Yong Zhang: Tsinghua University
Xiaoping Liang: Tsinghua University
Haomin Wang: Tsinghua University
Haojie Lu: Tsinghua University
Mengjia Zhu: Tsinghua University
Huimin Wang: Tsinghua University
Mingchao Zhang: Tsinghua University
Xinping Qiu: Tsinghua University
Yafeng Song: Beijing Sport University
Yingying Zhang: Tsinghua University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Numerous studies have shown flexible electronics play important roles in health management. The way of power supply is always an essential factor of devices and self-powered ones are very attractive because of the fabrication easiness, usage comfort and aesthetics of the system. In this work, based on the metal-air redox reaction, which is usually used in designing metal-air batteries, we design a self-powered chemoelectric humidity sensor where a silk fibroin (SF) and LiBr gel matrix containing parallel aligned graphene oxide (GO) flakes serve as the electrolyte. The abundant hydrophilic groups in GO/SF and the hygroscopicity of LiBr lead to tight dependence of the output current on the humidity, enabling the sensor high sensitivity (0.09 μA/s/1%), fast response (1.05 s) and quick recovery (0.80 s). As proofs of concept, we design an all-in-one respiratory monitoring-diagnosing-treatment system and a non-contact human-machine interface, demonstrating the applications of the chemoelectric humidity sensor in health management.

Date: 2022
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DOI: 10.1038/s41467-022-33133-y

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