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| Abstract No.: |
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Scheduled at:
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Friday, June 09, 2017, Hall 14 12:20 PM
Electronics & Sensoric
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| Title: |
Liquid flame spray fabrication of WO3-graphene nanocomposite coatings for gas-sensing applications
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| Authors: |
Hua Li* / Chinese Academy of Sciences, P.R. China
Yi Liu / Chinese Academy of Sciences, China
Jing Huang/ Chinese Academy of Sciences, China
Xinkun Suo/ Chinese Academy of Sciences, China
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| Abstract: |
Ozone (O3) is a respiratory irritant usually involved in adverse health events. For these reasons, the urgent need of gas sensors suitable for monitoring and controlling the gas has been raised. Among the gas sensors, metal oxide semiconductor sensors attracted the most attention owing to their environmental stability, cost efficiency, high sensitivity and selectivity. Tungsten oxide (WO3) is one of the sensing materials that show high response to O3. The structure of WO3 in the form of film/coating in nano-scale is desirable for high sensitivity of the sensors. Graphene is a fascinating material for sensing due to its large specific surface area for molecular adsorption and outstanding electrical properties such as low noise level and high carrier mobility. This study reports liquid flame spray fabrication and characterization of WO3-graphene nanocomposite coatings for gas-sensing devices. The starting feedstock was prepared from tungsten chloride (WCl6) and reduced graphene oxide for pyrolysis synthesis by flame spray of WO3-graphene. The coatings were successfully fabricated and their microstructure was examined by X-ray diffraction, Raman spectrometer, field emission-scanning electron microscopy and transmission electron microscopy. Nano-sized WO3 grains exhibited oriented nucleation and epitaxial growth on graphene flakes. The composite coatings retained intact nano-structural features of both WO3 and graphene. Nanostructural features of the WO3-graphene coatings can be tailored by adjusting spray power or starting feedstock. Gas-sensing activity of the coatings was examined by measuring their sensitivity for O3 and the sensors show excellent response to O3. These results provide clear insight into potential gas-sensing applications of the nanostructured WO3-graphene composite coatings deposited by liquid flame spraying.
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