H2S gas sensing performance and mechanisms using CuO-Al2O3 composite films based on both surface acoustic wave and chemiresistor techniques

Tang, Yongliang, Wu, Wei, Wang, Bangji, Dai, Xucheng, Xie, Wanfeng, Yang, Youwei, Zhang, Ruijie, Shi, Xin, Zhu, Hao, Luo, Jia, Guo, Yuanjun, Xiang, Xia, Zu, Xiaotao and Fu, Richard (2020) H2S gas sensing performance and mechanisms using CuO-Al2O3 composite films based on both surface acoustic wave and chemiresistor techniques. Sensors and Actuators B: Chemical, 325. p. 128742. ISSN 0925-4005

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Official URL: https://doi.org/10.1016/j.snb.2020.128742

Abstract

Surface acoustic wave and chemiresistor based gas sensors integrated with a sensing layer of sol-gel CuO-Al2O3 composite film were fabricated and their performance and mechanisms for H2S sensing were characterized and compared. In the composite film, CuO nanoparticles provide active sites for adsorption and reaction of H2S molecules while Al2O3 nanoparticles help to form a uniform and mesoporous film structure, both of which enhance the sensitivity of the sensors by providing numerous active CuO surfaces. Through the comparative studies, the SAW based H2S sensor operated at room temperature showed a lower detection limit, higher sensitivity, better linearity and good selectivity to H2S gas with its concentration ranging from 5 ppb to 100 ppm, compared with those of the chemiresistor sensor, which are mainly attributed to the effective mass sensing properties of the SAW sensor, because a minor change in the mass of the film caused by adsorbed H2S molecules would lead to a significant and monotonous change of the resonant frequency of the SAW devices.

Item Type: Article
Uncontrolled Keywords: surface acoustic wave (SAW), chemiresistor, H2S gas sensor, CuO-Al2O3, mass sensing
Subjects: F200 Materials Science
H800 Chemical, Process and Energy Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 24 Sep 2020 15:28
Last Modified: 24 Sep 2020 15:30
URI: http://nrl.northumbria.ac.uk/id/eprint/44255

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