High humidity enhanced surface acoustic wave (SAW) H2S sensors based on sol-gel CuO films

SENSORS AND ACTUATORS B-CHEMICAL

卷:294

Article

Li, Dengji¹  Zu, Xiaotao¹  Ao, Dongyi¹  Tang, Qingbo¹  Fu, YongQing⁴  Guo, Yuanjun¹  Bilawal, Khan¹  Faheem, M. Bilal³  Li, Li¹  Li, Sean⁵  Tang, Yongliang² 

[1] Univ Elect Sci & Technol China, Sch Phys, Chengdu 610054, Sichuan, Peoples R China

[2] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu 610031, Sichuan, Peoples R China

[3] Univ Elect Sci & Technol, Inst Fundamental & Frontier Sci, Chengdu 610054, Sichuan, Peoples R China

[4] Northumbria Univ, Fac Engn & Environm, Newcastle Upon Tyne NE1 8ST, Tyne & Wear, England

[5] UNSW Sydney, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

关键词: SAW sensors;    H2S;    CuO;    Physical adsorption;    RH;   

DOI  :  10.1016/j.snb.2019.04.010

来源: Elsevier

【 摘 要 】

Surface acoustic wave (SAW) sensors based on sol-gel processed porous and nanoparticulate CuO films were explored for H2S detection operated at room temperature. The SAW sensor showed a negative frequency shift when exposed to H2S gas, due to the mass loading effect on the sensitive CuO film. It has a high sensitivity of H2S, a detection limit of 500 ppb and a good selectivity to H2S gas compared with H-2, C2H5OH, acetone, NH3, CO, NO, NO2 gases. Relative humidity (RH) was identified to have a critical influence on the sensing performance of the sensor. The responses became much faster and stronger with the increase of RH. The significant enhancement in the sensing performance is attributed to that the chemical reaction between H2S and CuO is hindered and the physical adsorption of CuO to H2S is enhanced.

【 授权许可】

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