ZnO-Al2O3 nanocomposite as a sensitive layer for high performance surface acoustic wave H2S gas sensor with enhanced elastic loading effect

Tang, Yongliang, Xu, Xiaofeng, Han, Shaobo, Cai, Chao, Du, Huarong, Zhu, Hao, Zu, Xiaotao and Fu, Richard (2020) ZnO-Al2O3 nanocomposite as a sensitive layer for high performance surface acoustic wave H2S gas sensor with enhanced elastic loading effect. Sensors and Actuators B: Chemical, 304. p. 127395. ISSN 0925-4005

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Official URL: https://doi.org/10.1016/j.snb.2019.127395

Abstract

ZnO-Al2O3 nanocomposite was synthesized and developed as a high performance sensitive and selective layer for surface acoustic wave (SAW) sensor, aiming for in-situ detection of H2S gas in ppb level operated at room temperature. ZnO-Al2O3 nanocomposite, synthesized though a sol-gel method, was spin-coated onto a quartz based SAW resonator. This composite layer inherits the mesoporous structure of the Al2O3 layer and good affinity to H2S gas molecules of the ZnO layer, and thus can selectively adsorb and react with H2S gas molecules to form ZnS compounds on its surface. This reaction leads to significant decreases of both pore sizes and total pore volume of the layer, an increase of layer’s elastic modulus, thus causing a large positive shift of the frequency responses of the SAW sensor. The sensor operated at room temperature shows a frequency response of ∼500 Hz to 10 ppb H2S, with an excellent selectivity and good recovery property.

Item Type: Article
Uncontrolled Keywords: H2S, Gas sensor, Surface acoustic wave, ZnO-Al2O3, Elastic modulus
Subjects: F200 Materials Science
F300 Physics
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 11 Nov 2019 10:04
Last Modified: 10 Mar 2020 15:00
URI: http://nrl.northumbria.ac.uk/id/eprint/41403

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