Jump to main content
Jump to site search

Issue 3, 2019
Previous Article Next Article

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

Author affiliations

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

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Nov 2018, accepted on 03 Jan 2019 and first published on 09 Jan 2019


Article type: Research Article
DOI: 10.1039/C8QM00596F
Citation: Mater. Chem. Front., 2019,3, 484-491

  •   Request permissions

    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

Search articles by author

Spotlight

Advertisements