Highly porous Fe2O3-SiO2 layer for acoustic wave based H2S sensing: mass loading or elastic loading effects?

Wang, Junsen, Che, Jian, Qiao, Changcang, Niu, Ben, Zhang, Wenting, Han, Yuchen, Fu, Yong Qing and Tang, Yongliang (2022) Highly porous Fe2O3-SiO2 layer for acoustic wave based H2S sensing: mass loading or elastic loading effects? Sensors and Actuators B: Chemical, 367. p. 132160. ISSN 0925-4005

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Official URL: https://doi.org/10.1016/j.snb.2022.132160

Abstract

A highly porous Fe2O3-SiO2 layer prepared using sol-gel and spin-coating methods was applied on the surface of a surface acoustic wave (SAW) device for H2S sensing. SiO2 in this sensing layer serves as a porous support for dispersing Fe2O3 nanoparticles, and Fe2O3 nanoparticles can effectively adsorb and react with H2S molecules. By changing the Fe/Si molar ratio in this Fe2O3-SiO2 layer, its pore volume, pore distribution and H2S adsorption capacity can be adjusted, the contribution of mass loading effect and the elastic loading effect toward the frequency response of the sensor can be controlled, and the sensing performance of the sensor can be optimized. The optimized sensing response is − 4.4 kHz toward 100 ppm H2S, with a good selectivity and reproducibility operated at room temperature (25 ℃).

Item Type: Article
Additional Information: Funding information: This work was supported by the National Natural Science Foundation of China (11805158, 61178018), and the Engineering Physics and Science Research Council of UK (EPSRC EP/P018998/1).
Uncontrolled Keywords: SAW sensor, H2S, Fe2O3-SiO2, Mass loading, Elastic loading
Subjects: F200 Materials Science
F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 13 Jun 2022 11:57
Last Modified: 13 Jun 2022 12:00
URI: http://nrl.northumbria.ac.uk/id/eprint/49296

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