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

被引：12
作者：
Wang, Junsen [1 ]
Che, Jian [1 ]
Qiao, Changcang [1 ]
Niu, Ben [1 ]
Zhang, Wenting [1 ]
Han, Yuchen [2 ]
Fu, Yongqing [3 ]
Tang, Yongliang [1 ]
机构：
[1] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu 610031, Peoples R China
[2] Univ Elect Sci & Technol China, Sch Phys, Chengdu 610054, Peoples R China
[3] Northumbria Univ, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, England
来源：
SENSORS AND ACTUATORS B-CHEMICAL | 2022年 / 367卷
基金：
英国工程与自然科学研究理事会; 中国国家自然科学基金;
关键词：
SAW sensor; H2S; Fe2O3-SiO2; Mass loading; Elastic loading; HYDROGEN-SULFIDE; SENSOR; CUO; NO2;
D O I：
10.1016/j.snb.2022.132160
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
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 Fe(2)O(3 )nanoparticles, and Fe(2)O(3 )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 ?).
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页数：9
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