Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/58777
Title: WO<inf>3</inf>nanotubes−SnO<inf>2</inf>nanoparticles heterointerfaces for ultrasensitive and selective NO<inf>2</inf>detections
Authors: Jirasak Sukunta
Anurat Wisitsoraat
Adisorn Tuantranont
Sukon Phanichphant
Chaikarn Liewhiran
Keywords: Materials Science
Issue Date: 15-Nov-2018
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.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85050134296&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/58777
ISSN: 01694332
Appears in Collections:CMUL: Journal Articles

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