Enhanced NO2 sensing of SnO2/SnS2 heterojunction based sensor

•The SnO2/SnS2 heterojunctions based gas sensor exhibits excellent sensitivity to NO2 from 1ppm to 8ppm at the lower temperatures.•The enhanced NO2 sensing was attributed to the increased active sites for NO2 adsorption and formed heterojunctions inducing extra electrons.•The sensor shows an excelle...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2017-06, Vol.244, p.67-76
Main Authors: Gu, Ding, Li, Xiaogan, Zhao, Yangyang, Wang, Jing
Format: Article
Language:English
Subjects:
Gas sensors
NO2
SnO2/SnS2 heterojucntion
SnS2 nanosheets
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Summary:•The SnO2/SnS2 heterojunctions based gas sensor exhibits excellent sensitivity to NO2 from 1ppm to 8ppm at the lower temperatures.•The enhanced NO2 sensing was attributed to the increased active sites for NO2 adsorption and formed heterojunctions inducing extra electrons.•The sensor shows an excellent selectivity compared to several gas vapors such as formaldehyde, alcohols, acetone, benzene, and methylbenzene. SnS2 nanosheets decorated with SnO2 nanocomposites have been successfully prepared by in-situ high-temperature oxidizing pristine SnS2 in air at 300°C. The formed SnO2/SnS2 heterojunction based chemiresistive gas sensor exhibits an excellent sensitivity and selectivity to different concentrations of NO2 from 1ppm to 8ppm at 80°C. The higher response of the as-fabricated SnO2/SnS2 heterojunction based sensor to NO2 compared with that of the pure SnS2 based one could be attributed to the extra charge transfer between SnO2/SnS2 interfaces.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2016.12.125