Graphene/LiNbO3 surface acoustic wave device based relative humidity sensor

Guo, Yuanjun, Zhang, Jia, Zhao, Chao, Hu, Ping An, Zu, Xiao-Tao and Fu, Yong Qing (2014) Graphene/LiNbO3 surface acoustic wave device based relative humidity sensor. Optik - International Journal for Light and Electron Optics, 125 (19). pp. 5800-5802. ISSN 0030 4026

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Official URL: http://dx.doi.org/10.1016/j.ijleo.2014.06.090

Abstract

This study described relative humidity (RH) sensing using a graphene/128° YX LiNbO3 surface acoustic wave (SAW) device. The resonant frequency of the device decreased in a two-stage manner as the RH increased. For a low RH range (RH < 50%), a frequency downshift of 1.38 kHz per 1% RH change was observed. This was attributed to mass loading of the SAW propagation surface due to the adsorption of water molecules by the graphene surface. For a high RH range (RH > 50%), a frequency downshift of 2.6 kHz per 1% RH change was obtained, which was due to the change in elastic grapheme properties. The mass loading effect of the water layer was less effective at high temperature, resulting in a lower temperature coefficient of resonant frequency (TCF).

Item Type: Article
Uncontrolled Keywords: Graphene, LiNbO3 SAW device, relative humidity, TCF
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Physics and Electrical Engineering
Depositing User: Becky Skoyles
Date Deposited: 23 Mar 2015 15:12
Last Modified: 31 Mar 2016 15:25
URI: http://nrl.northumbria.ac.uk/id/eprint/21737

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