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

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Abstract

In this work, the different weight percentages of Ag (from 0 wt.% to 12 wt.%)-doped SnO2 nanostructure layers were created by the spray pyrolysis, and their H2S gas sensing characteristics were investigated. The effect of various amounts of Ag on morphology and sensing properties to H2S such as sensitivity, selectivity, and the response was studied. The fabricated sensors showed fast responses to different concentrations (0.1–50 ppm) of H2S 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 H2S 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.

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Authors and Affiliations

  1. Department of Physics, Technical and Vocational University (TVU), Tehran, Iran

    Farshad Khoshnood

  2. Department of Physics, Faculty of Science, Malek Ashtar University of Technology, Shahinshahr, Isfahan, Iran

    Sohrab Manouchehri & Mohammad Hasan Yousefi

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  1. Farshad Khoshnood
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  2. Sohrab Manouchehri
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  3. Mohammad Hasan Yousefi
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Khoshnood, F., Manouchehri, S. & Yousefi, M.H. Sensing Sub-ppm Concentration of H2S Gas at Room Temperature Using Silver-Doped SnO2 Nanocrystals. J. Electron. Mater. 51, 1804–1812 (2022). https://doi.org/10.1007/s11664-022-09447-4

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  • DOI: https://doi.org/10.1007/s11664-022-09447-4

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