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Nanomaterials 2019, 9(3), 351; https://doi.org/10.3390/nano9030351

Enhanced Methane Sensing Properties of WO3 Nanosheets with Dominant Exposed (200) Facet via Loading of SnO2 Nanoparticles

1
The Collaboration Innovation Center of Coal Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo 454000, China
2
Institute of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
3
Institute of Physics & Electronic Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
4
Institute of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
*
Authors to whom correspondence should be addressed.
Received: 6 February 2019 / Revised: 19 February 2019 / Accepted: 20 February 2019 / Published: 4 March 2019
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Abstract

Methane detection is extremely difficult, especially at low temperatures, due to its high chemical stability. Here, WO3 nanosheets loaded with SnO2 nanoparticles with a particle size of about 2 nm were prepared by simple impregnation and subsequent calcination using SnO2 and WO3·H2O as precursors. The response of SnO2-loaded WO3 nanosheet composites to methane is about 1.4 times higher than that of pure WO3 at the low optimum operating temperature (90 °C). Satisfying repeatability and long-term stability are ensured. The dominant exposed (200) crystal plane of WO3 nanosheets has a good balance between easy oxygen chemisorption and high reactivity at the dangling bonds of W atoms, beneficial for gas-sensing properties. Moreover, the formation of a n–n type heterojunction at the SnO2-WO3 interface and additionally the increase of specific surface area and defect density via SnO2 loading enhance the response further. Therefore, the SnO2-WO3 composite is promising for the development of sensor devices to methane. View Full-Text
Keywords: SnO2-loaded WO3 nanosheets; methane sensing; heterojunction; exposed (200) facet SnO2-loaded WO3 nanosheets; methane sensing; heterojunction; exposed (200) facet
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Xue, D.; Wang, J.; Wang, Y.; Sun, G.; Cao, J.; Bala, H.; Zhang, Z. Enhanced Methane Sensing Properties of WO3 Nanosheets with Dominant Exposed (200) Facet via Loading of SnO2 Nanoparticles. Nanomaterials 2019, 9, 351.

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