A humidity sensor based on quartz crystal microbalance using graphene oxide as a sensitive layer

Jin, Hao, Tao, Xiang, Feng, Bin, Yu, Liyang, Dong, Shurong and Luo, J. ORCID: 0000-0003-0310-2443 (2017) A humidity sensor based on quartz crystal microbalance using graphene oxide as a sensitive layer. Vacuum, 140. pp. 101-105. ISSN 0042-207X

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Abstract

Humidity is a vital physical quantity which is extremely important to production quality control, reliability of electronics, and health of human being. This paper proposed a humidity sensor based on quartz crystal microbalance (QCM) using graphene oxide as a sensitive layer, and investigated the characteristics of sensor according to the shift of quality factor (Q factor) as well as resonant frequency at different relative humidity (RH). Results show that at low RH values, the shift of Q factor is more suitable than the shift of resonant frequency for assessing the sensitivity of the sensor. By combining both frequency and Q factor shifts, we obtain a sensitivity of ∼1371/1%RH at 10–60%RH (by Q factor) and 1068 Hz/10%RH at 70%RH (by frequency), which are much better than the reported QCM humidity sensors, with good linearity. The QCM humidity sensor also shows good repeatability with response time and recovery time smaller than 20 and 3 s, respectively. These good characteristics of the sensor are attributed to the large surface area and high hydrophilic nature of the graphene oxide, demonstrated good potential for future applications.

Item Type: Article
Uncontrolled Keywords: Quartz crystal microbalanceGraphene oxideHumidity sensorResonant frequencyQ factor
Subjects: Q Science > Q Science (General)
Divisions: University of Bolton Research Centres > Institute for Renewable Energy and Environmental Technologies
Depositing User: Sarah Taylor
Date Deposited: 20 Mar 2018 09:11
Last Modified: 30 May 2018 09:28
Identification Number: 10.1016/j.vacuum.2016.10.017
URI: http://ubir.bolton.ac.uk/id/eprint/1461

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