H2S Detection Sensing Characteristic of CuO/SnO2 Sensor

Sensors

Jinhuai Liu¹  Xingjiu Huang¹  Gang Ye¹  Wei Liu¹  Zheng Jiao¹  Wnaglian Chao¹  Zhongbai Zhou¹ 

[1] ¹Institute of Plasma Physics, Chinese Academy of Science, Hefei, 230031, P.R. China ²Hefei Institute of Intelligent Machines, Chinese Academy of Science, Hefei, 230031, P.R. China ³College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072, P.R. China

关键词: Tin oxide;    copper oxide;    sensing properties;    H2S;   

DOI  :  10.3390/s30500110

来源: mdpi

【 摘 要 】

Among the various metal oxide additives tested, the complex of CuO is outstanding in promoting the sensing propoerties of an SnO₂ sensor for H₂S in air. The SnO₂ sensors loaded with 5 wt. % CuO is extremely sensitive to H₂S at 200 C° and below, while it is almost unsensitive to many other gases. The response to H₂S is rather slow but the recovery is very rapid. Tha added CuO particles interact electronically with the surface of SnO₂ (p-n junctions) to make the sensor highly resistive, while the interaction is disconnected when CuO is sulfurized to CuS in the H₂S containing atmosphere, leading to a drastic decrease in electrical resistance. The H₂S sensing properties, particularly the rate of response of CuO/SnO₂ sensors are influenced by the CuO loadings andoperating temperature as well as the thickness of Cuo loading film.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.