An Au/SnO–SnO2 nanosheet based composite used for rapid detection of hydrogen sulphide

In this work, a new type of H2S sensor was fabricated by means of drop-coating of an Au/SnO–SnO2 nanosheet material, which was prepared by a one-pot hydrothermal reaction, onto a gold electrode in an alumina ceramic tube with the formation of a thin nanocomposite film. The microstructure and morphol...

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Bibliographic Details
Published in:Analytical methods 2023-03, Vol.15 (10), p.1315-1322
Main Authors: Hao-Yun Zou, Lin-Xuan, Li, Huang, Ying, Tang, Yi, Wu, Jian-Ping, Zhong-Liang, Xiao, Ju-Lan Zeng, Yu, Donghong, Cao, Zhong
Format: Article
Language:English
Subjects:
Aluminum oxide
Ambient temperature
Electron microscopy
Gold coatings
Hydrogen sulfide
Hydrothermal reactions
Microscopy
Nanocomposites
Nanosheets
Operating temperature
Recovery time
Scanning electron microscopy
Selectivity
Sensors
Service life
Tin dioxide
Transmission electron microscopy
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Summary:In this work, a new type of H2S sensor was fabricated by means of drop-coating of an Au/SnO–SnO2 nanosheet material, which was prepared by a one-pot hydrothermal reaction, onto a gold electrode in an alumina ceramic tube with the formation of a thin nanocomposite film. The microstructure and morphology of the nanosheet composites were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A gas-sensitivity study presented good H2S-sensing performance of such Au/SnO–SnO2 nanosheet composites. At an optimal operating temperature of 240 °C and ambient temperature of 25 °C, the resulting sensor showed a good linear response to H2S in a range of 1.0 to 100 ppm with a low detection limit of 0.7 ppm, and a very fast response–recovery time of 22 s for response and 63 s for recovery, respectively. The sensor was also unaffected by ambient humidity and had good reproducibility and selectivity. When being applied to the monitoring of H2S in an atmospheric environment in a pig farm, the response signal to H2S was only attenuated by 4.69% within 90 days, proving that the sensor had a long and stable service lifetime for continuous running and showing its important practical application prospects.
ISSN:1759-9660
1759-9679
DOI:10.1039/d2ay01891h