Sensing Sub-ppm Concentration of H2S Gas at Room Temperature Using Silver-Doped SnO2 Nanocrystals

• Published in: Journal of electronic materials 2022-04, Vol.51 (4), p.1804-1812
• Main Authors: Khoshnood, Farshad, Manouchehri, Sohrab, Yousefi, Mohammad Hasan
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Electronics and Microelectronics; Instrumentation; Materials Science; Optical and Electronic Materials; Original Research Article; Solid State Physics
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-022-09447-4

In this work, the different weight percentages of Ag (from 0 wt.% to 12 wt.%)-doped SnO 2 nanostructure layers were created by the spray pyrolysis, and their H 2 S gas sensing characteristics were investigated. The effect of various amounts of Ag on morphology and sensing properties to H 2 S such as sensitivity, selectivity, and the response was studied. The fabricated sensors showed fast responses to different concentrations (0.1–50 ppm) of H 2 S gas at room temperature without a heater. The findings demonstrated that doping tin oxide with Ag increased the sensing properties of the samples when compared to the pure sample. Among the manufactured samples, the one doped with 4 wt.% Ag had the best sensing properties. This sample had a 27% response for 0.1 ppm concentration of H 2 S gas and also had a much better selectivity than other samples. This good response is the result of a large surface-to-volume ratio and a small particle size.