Issue

Vol. 15 (2023)

Functionalized Hydrogel-Based Wearable Gas and Humidity Sensors

https://doi.org/10.1007/s40820-023-01109-2
Yibing Luo
State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
Jianye Li
State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
Qiongling Ding
State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
Hao Wang
State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
Chuan Liu
State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China
Jin Wu
State Key Laboratory of Optoelectronic Materials and Technologies and the Guangdong Province Key Laboratory of Display Material and Technology, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, People’s Republic of China

Corresponding Author: Jin Wu

wujin8@mail.sysu.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 136

Abstract

Breathing is an inherent human activity; however, the composition of the air we inhale and gas exhale remains unknown to us. To address this, wearable vapor sensors can help people monitor air composition in real time to avoid underlying risks, and for the early detection and treatment of diseases for home healthcare. Hydrogels with three-dimensional polymer networks and large amounts of water molecules are naturally flexible and stretchable. Functionalized hydrogels are intrinsically conductive, self-healing, self-adhesive, biocompatible, and room-temperature sensitive. Compared with traditional rigid vapor sensors, hydrogel-based gas and humidity sensors can directly fit human skin or clothing, and are more suitable for real-time monitoring of personal health and safety. In this review, current studies on hydrogel-based vapor sensors are investigated. The required properties and optimization methods of wearable hydrogel-based sensors are introduced. Subsequently, existing reports on the response mechanisms of hydrogel-based gas and humidity sensors are summarized. Related works on hydrogel-based vapor sensors for their application in personal health and safety monitoring are presented. Moreover, the potential of hydrogels in the field of vapor sensing is elucidated. Finally, the current research status, challenges, and future trends of hydrogel gas/humidity sensing are discussed.


Highlights:


1 A systematic summary of the research progress of hydrogel-based gas and humidity sensors is presented.
2 The sensing mechanism of hydrogel-based gas and humidity sensors is elaborated.
3 The potential of hydrogel-based vapor sensors in different fields of application is demonstrated.

Keywords

Health and safety monitoring Gas and humidity sensor Functionalized hydrogel Wearable sensor Flexible and stretchable sensor
Luo, Yibing, Jianye Li, Qiongling Ding, Hao Wang, Chuan Liu, and Jin Wu. 2023. “Functionalized Hydrogel-Based Wearable Gas and Humidity Sensors”. Nano-Micro Letters 15 (May):136. https://doi.org/10.1007/s40820-023-01109-2.
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