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Open AccessCommunication

A Simple Dip-Coating Method of SnO2-NiO Composite Thin Film on a Ceramic Tube Substrate for Methanol Sensing

1
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130118, China
2
College of Chemistry, Jilin University, Changchun 130118, China
3
College of Electronic Science and Engineering, Jilin University, Changchun 130118, China
*
Authors to whom correspondence should be addressed.
Crystals 2019, 9(12), 621; https://doi.org/10.3390/cryst9120621
Received: 2 November 2019 / Revised: 21 November 2019 / Accepted: 25 November 2019 / Published: 26 November 2019
In this work, SnO2-NiO composite thin film was successfully grown on a ceramic tube substrate directly by a simple dip-coating method combined with annealing. Characterization analysis demonstrates that uniform SnO2 film consists of a great number of nanospheres and NiO grows on SnO2 as an agglomerated block. In comparison to the pure SnO2 sample, the SnO2-NiO composite thin films gas sensor exhibits superior methanol sensing properties at 225 °C. The gas response to 10 ppm methanol reached 15.12 and the response and recovery times were 8 s and 7 s, respectively. The excellent selectivity and recovery rate are explained by the unique properties of the NiO semiconductor and the higher sensor response is attributed to the pivotal heterojunction effect.
Keywords: SnO2-NiO composite; gas sensor; methanol; dip-coating; heterojunction SnO2-NiO composite; gas sensor; methanol; dip-coating; heterojunction
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MDPI and ACS Style

Liu, T.; Xu, L.; Wang, X.; Li, Q.; Cui, Q.; Suo, H.; Zhao, C. A Simple Dip-Coating Method of SnO2-NiO Composite Thin Film on a Ceramic Tube Substrate for Methanol Sensing. Crystals 2019, 9, 621.

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