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| Abstract No.: |
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| Title: |
Nitrogen-dioxide sensing properties of solution precursor plasma sprayed zinc oxide coatings with oxygen vacancies
Microstructure and photocatalytic properties of TiO2 coatings deposited by solution precursor plasma spray
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| Authors: |
Chao Zhang / Yangzhou University, China
Dayu Li* / Yangzhou University, China
Jiawei Li/ Yangzhou University, China
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| Abstract: |
ZnOx coatings were prepared by solution precursor plasma spray on alumina substrate equipped with interdigital gold electrodes. The field-emission scanning electron microscopy images illustrated that the as-sprayed coatings were porous and nanostructured. The X-ray diffraction pattern showed that the main peaks were hexagonal ZnO together with obvious alumina peaks emitted from the substrate. The XPS characterization gave an obvious presence of oxygen vacancies in the coatings. The UV-Vis spectra confirmed a significant absorption in visible-light range. The band-gap of the as-sprayed coating was estimated to be 2.1 eV, which was much less than that of stoichiometric ZnO. The oxygen-vacant sensors show significant responses to NO2 even as low as 0.4 ppm, and the sensor response increases linearly with NO2 concentration. The enhanced sensor properties were attributed to the presence of oxygen vacancies and the porous nanostructure.
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