Journal
APPLIED SURFACE SCIENCE
Volume 462, Issue -, Pages 330-336Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.08.115
Keywords
2D materials; SnS2; Reduced graphene oxide (rGO); Gas sensor; Hybrid; Low operating temperature
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Funding
- Australian Government Research Training Program Scholarship
- Australian Research Council - Discovery Project [ARC DP180102752]
- ARC [DP150101939]
- Queensland Government through the Q-CAS Collaborative Science Fund 2016
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The excellent sensing capabilities of SnS2 and the electrical properties of reduced graphene oxide (rGO) are combined to achieve a low-operating temperature NO2 gas sensor. Conductometric gas sensors based on hybrid films of 2D SnS2-rGO are fabricated and evaluated for humidity and different target gases including NO2, CH4, NH3, C2H5OH (ethanol), (CH3)(2)CO (acetone) at different operating temperatures ranging from 25 degrees C to 100 degrees C. The sensor shows exclusive selectivity and reversibility to NO2 as compared to the other analytes, with a low detection limit of 0.6 ppm and a response of 9.8% at 80 degrees C. The sensing mechanism of the hybrid SnS2-rGO system is described by analysing the effect of NO2 gas on the depletion region established at the interface between SnS2 and rGO layers.
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