Publication: SnO<inf>2</inf>-graphene composite gas sensor for a room temperature detection of ethanol
Issued Date
2020-12-23
Resource Type
ISSN
13616528
09574484
09574484
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2-s2.0-85098577865
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Mahidol University
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SCOPUS
Bibliographic Citation
Nanotechnology. Vol.32, No.11 (2020)
Suggested Citation
Natpichan Pienutsa, Pakpong Roongruangsree, Venus Seedokbuab, Krittamet Yannawibut, Chayanit Phatoomvijitwong, Sira Srinives SnO<inf>2</inf>-graphene composite gas sensor for a room temperature detection of ethanol. Nanotechnology. Vol.32, No.11 (2020). doi:10.1088/1361-6528/abcfea Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/60892
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Title
SnO<inf>2</inf>-graphene composite gas sensor for a room temperature detection of ethanol
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Abstract
© 2020 IOP Publishing Ltd. In ethanol production, it is useful to monitor the state of fermentation using a sensor that provides real-time measurement but does not disturb the process. We propose here a tin oxide (SnO2)-reduced graphene oxide (rGO) composite chemiresistive sensor that can be operated on low power and installed in a compact area for the monitoring of ethanol vapor. The sensor exhibited outstanding sensing responses to 29-145 ppm ethanol vapor, providing a sensitivity of 12 ppm-1, a response time of 123 ± 6, recovery time of 128 ± 42 s, and a limit of detection of 3 ppm. The sensor showed good selectivity to ethanol over carbon dioxide, acetic acid and water vapor. The sensing mechanism of the sensor relies on the reaction of ethanol vapor and chemisorbed oxygen species in which the reaction rate increases due to an abundance of the chemisorbed oxygen within n-p heterojunctions of SnO2-rGO.