Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 668, Issue -, Pages 128-136Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.01.219
Keywords
Gas sensors; Tungsten oxide; Plasma spray; Nitrogen dioxide; Microstructure
Categories
Funding
- Natural Science Foundation of China [51402255]
- Jiangsu Natural Science Foundation of China [BK20140487]
- Testing Center of Yangzhou University
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Increasing attention has been paid on preparation methods for resistive-type gas sensors based on semiconductor metal oxides. In this work, tungsten oxide (WO3) coatings were prepared on alumina substrates and used as gas sensitive layers. The coatings were deposited by atmospheric plasma spray using powder, solution precursor, or a combination of both. Tungsten oxide powder through a powder port and ammonium tungstate aqueous solution through a liquid port were injected into plasma stream respectively or together to deposit WO3 coatings. Phase structures in the coatings were characterized by X-ray diffraction analyzer. The field-emission scanning electron microscopy images confirmed that the coatings were in microstructure, nanostructure or micro-nanostructure. The sensing properties of the sensors based on the coatings exposed to 1 ppm nitrogen dioxide gas were characterized in a home-made instrument. Sensing properties of the coatings were compared and discussed. The influences of gas humidity and working temperature on the sensor responses were further studied. (C) 2016 Elsevier B.V. All rights reserved.
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