Issue 4, 2019

The critical role of hydroxyl groups in water vapor sensing of graphene oxide

Abstract

Excellent adsorption of water vapor on the surface of graphene oxide (GO), which contains several inherited functional groups, leads to the development of improved humidity monitoring systems that can urgently meet the high industrial demand. In this study, we fabricated a GO-based humidity sensor and investigated the influence of hydroxyl group concentration on its performance. The sensor exhibited excellent humidity sensing performance in terms of sensitivity (sensor response ∼40 for 90% RH), selectivity, stability (both long-term and short-term) and reaction time (τres = 8.5 s and τrec = 13 s). Additionally, this sensor does not require external power consumption for heating; thus, the aforementioned performance (recorded at room temperature) with an applied voltage of 0.1 V can significantly reduce the power/energy consumption to about ∼1.314 × 10−4 kW h per year. In the future, this type of sensor can be integrated into smart humidity monitoring systems to not only monitor but also control the humidity levels on a specific application area. Based on complementary characterization techniques, such as XRD, AFM, Raman and electrical measurement, here, we propose a physical-chemical sensing model to elucidate the aforementioned sensor characteristics.

Graphical abstract: The critical role of hydroxyl groups in water vapor sensing of graphene oxide

  • This article is part of the themed collection: Gas sensing

Supplementary files

Article information

Article type
Paper
Submitted
07 8 2018
Accepted
21 10 2018
First published
26 10 2018
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2019,1, 1319-1330

The critical role of hydroxyl groups in water vapor sensing of graphene oxide

Q. Fatima, A. A. Haidry, Z. Yao, Y. He, Z. Li, L. Sun and L. Xie, Nanoscale Adv., 2019, 1, 1319 DOI: 10.1039/C8NA00135A

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