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, Yuchen Han, Yongqing Fu, Yongliang Tang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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 ℃).
Original languageEnglish
Article number132160
Number of pages9
JournalSensors and Actuators B: Chemical
Volume367
Early online date4 Jun 2022
DOIs
Publication statusE-pub ahead of print - 4 Jun 2022

Fingerprint

Dive into the research topics of 'Highly porous Fe2O3-SiO2 layer for acoustic wave based H2S sensing: mass loading or elastic loading effects?'. Together they form a unique fingerprint.

Cite this