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dc.contributor.authorJirasak Sukuntaen_US
dc.contributor.authorAnurat Wisitsoraaten_US
dc.contributor.authorAdisorn Tuantranonten_US
dc.contributor.authorSukon Phanichphanten_US
dc.contributor.authorChaikarn Liewhiranen_US
dc.description.abstract© 2018 In this work, the SnO2nanoparticles−WO3nanotubes heterostructures are reported for the first time and systematically investigated for NO2detection. The hybrid SnO2−WO3sensing films were fabricated by thermal decomposition of WS2nanotubes loaded flame-spray-made SnO2nanoparticles with varying WS2contents (0.5–10 wt%). Characterizations by X-ray diffraction, electron microscopy, thermogravimetric, differential thermal analysis and X-ray photoelectron spectroscopy indicated that hexagonal WS2nanotubes were completely converted to orthorhombic WO3nanotubes and well-dispersed within polycrystalline tetragonal SnO2nanoparticles. The gas-sensing results revealed that the addition of WO3nanotubes to SnO2nanoparticles led to the substantial enhancement of sensor response towards NO2. Specifically, the 5 wt% WO3loaded SnO2sensor exhibited an ultra-high response of ∼12,800 to 5 ppm NO2with good recovery stabilization at a low optimal operating temperature of 150 °C. In addition, the WO3-loaded SnO2sensor presented high NO2selectivity against CH4, NO, C2H5OH, C3H6O, H2S and H2. The enhanced NO2sensing properties may be ascribed to the formation of WO3nanotubes/SnO2nanoparticles n-n hetero interfaces and the enhanced accessible surface areas of highly active sites for chemisorbed NO2species. Therefore, SnO2nanoparticles−WO3nanotubes composite structure prepared by flame spray pyrolysis and thermal decomposition is highly promising for highly sensitive and selective NO2-sensing applications.en_US
dc.subjectMaterials Scienceen_US
dc.titleWO<inf>3</inf>nanotubes−SnO<inf>2</inf>nanoparticles heterointerfaces for ultrasensitive and selective NO<inf>2</inf>detectionsen_US
article.title.sourcetitleApplied Surface Scienceen_US
article.volume458en_US Mai Universityen_US National Electronics and Computer Technology Centeren_US International Institute of Technology, Thammasat Universityen_US
Appears in Collections:CMUL: Journal Articles

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