Issue 3, 2019

Fast-response ionogel humidity sensor for real-time monitoring of breathing rate

Abstract

Ionogel-based chemoresistive humidity sensors have been successfully fabricated through ionothermal assembly of ionic liquids into a silica network. Our results demonstrated that ionogel sensors with different types of anions (Br, BF4, and PF6) exhibited good humidity sensitivity, low humidity hysteresis, and good reproducibility. In particular, the response and recovery times of the SiO2/[Bmim]Br-based sensor reached 3 s and 10 s, respectively, which were considerably shorter than those of other SiO2-based humidity sensors. The improved sensitivity characteristics of SiO2/[Bmim]Br can be attributed to its high conductivity and hydrophilicity, resulting in fast ion transfer using Br and H3O+ as charge carriers under humid conditions. Furthermore, this ionogel sensor showed fast and substantial changes in impedance with changing humidity for real-time monitoring of human breath. These findings are expected to provide opportunities for the design and fabrication of high-performance sensors for online humidity monitoring.

Graphical abstract: Fast-response ionogel humidity sensor for real-time monitoring of breathing rate

Supplementary files

Article information

Article type
Research Article
Submitted
20 Nov 2018
Accepted
03 Jan 2019
First published
09 Jan 2019

Mater. Chem. Front., 2019,3, 484-491

Fast-response ionogel humidity sensor for real-time monitoring of breathing rate

S. Xiao, J. Nie, R. Tan, X. Duan, J. Ma, Q. Li and T. Wang, Mater. Chem. Front., 2019, 3, 484 DOI: 10.1039/C8QM00596F

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