Highly sensitive and selective Love mode surface acoustic wave ammonia sensor based on graphene oxides operated at room temperature

Q.B. Tang, Y. J. Guo, Yong Liang Tang, G. D. Long, J. L. Wang, D. J. Li, Xiao-Tao Zu, J.Y. Ma, L. Wang, Hamdi Torun, Yong Qing Fu

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Abstract

It is crucial to develop highly sensitive and selective sensors for ammonia, one of the most common toxic gases which have been widely used in pharmaceutical, chemical and manufacturing industries. In this study, graphene oxide (GO) film was spin-coated onto surfaces of ST-cut quartz surface acoustic wave (SAW) devices with a resonant frequency of 200 MHz for ammonia sensing. The oxygen-containing functional groups (such as hydroxyl and epoxy ones) on the surface of GO film strongly absorb ammonia molecules and thus increase the film stiffness. This is attributed to the main ammonia sensing mechanism of the Love mode SAW devices, which show not only a positive frequency shift of 620 Hz for 500 ppb ammonia gas, but also an excellent selectivity (as compared to other gases such as H2, H2S, CO and NO2) and a good reproducibility, operated at room temperature of 22 oC.
Original languageEnglish
Pages (from-to)11925-11935
Number of pages11
JournalJournal of Materials Science
Volume54
Issue number18
Early online date13 Jun 2019
DOIs
Publication statusPublished - 1 Sep 2019

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