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

Junsen Wang, Jian Che, Changcang Qiao, Ben Niu, Wenting Zhang, Yucheng Han, Yongqing Fu, Yongliang Tang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A highly porous Fe 2 O 3 -SiO 2 layer prepared using sol-gel and spin-coating methods was applied on the surface of a surface acoustic wave (SAW) device for H 2 S sensing. SiO 2 in this sensing layer serves as a porous support for dispersing Fe 2 O 3 nanoparticles, and Fe 2 O 3 nanoparticles can effectively adsorb and react with H 2 S molecules. By changing the Fe/Si molar ratio in this Fe 2 O 3 -SiO 2 layer, its pore volume, pore distribution and H 2 S 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 H 2 S, with a good selectivity and reproducibility operated at room temperature (25 ℃).
Original languageEnglish
Number of pages27
JournalSSRN Electronic Journal
DOIs
Publication statusSubmitted - 11 Apr 2022

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