NDLI: Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

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Quartz Crystal Microbalance Humidity Sensors Based on Structured Graphene Oxide Membranes with Magnesium Ions: Design, Mechanism and Performance

Content Provider	MDPI
Author	Yi, Ruobing Peng, Bingquan Zhao, Yimin Nie, Dexi Chen, Liang Zhang, Lei
Copyright Year	2022
Description	The application of graphene oxide (GO)-based membranes combined with a quartz crystal microbalance (QCM) as a humidity sensor has attracted great interest over the past few years. Understanding the influence of the structure of the GO membrane (GOM) on the adsorption/desorption of water molecules and the transport mechanism of water molecules in the membrane is crucial for development of applications using GOM-based humidity sensors. In this paper, by investigating the effects of oxygen-containing groups, flake size and interlayer spacing on the performance of humidity sensing, it was found that humidity-sensing performance could be improved by rational membrane-structure design and the introduction of magnesium ions, which can expand the interlayer spacing. Therefore, a novel $HGO&GO&Mg^{2+}$ structure prepared by uniformly doping magnesium ions into GO&HGO thin composite membranes was designed for humidity sensing from 11.3% RH to 97.3% RH. The corresponding sensor exhibits a greatly improved humidity sensitivity (~34.3 Hz/%RH) compared with the original pure GO-based QCM sensor (~4.0 Hz/%RH). In addition, the sensor exhibits rapid response/recovery times (7 s/6 s), low hysteresis (~3.2%), excellent repeatability and good stability. This research is conducive to understanding the mechanism of GOM-based humidity sensors. Owing to its good humidity-sensing properties, the $HGO&GO&Mg^{2+}$ membrane-based QCM humidity sensor is a good candidate for humidity sensing.
Starting Page	125
e-ISSN	20770375
DOI	10.3390/membranes12020125
Journal	Membranes
Issue Number	2
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2022-01-21
Access Restriction	Open
Subject Keyword	Membranes Industrial Engineering Humidity Sensor Graphene Oxide Interlayer Spacing Response-frequency Shift Response/recovery Time
Content Type	Text
Resource Type	Article

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