期刊
APPLIED SURFACE SCIENCE
卷 528, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2020.147041
关键词
Atmospheric plasma spraying; ZnO; Coatings; Oxygen vacancy; NO2; Gas sensor
类别
资金
- National Key Research and Development Program of China [2017YFE0115900]
- Natural Science Foundation of China [51872254]
- Yangzhou City-Yangzhou University Cooperation Foundation [YZU201801]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province
NO2 is one of the main pollutants that affect air quality, and the use of ZnO as a gas-sensitive material to prepare sensors for NO2 detection has broad prospects. Wide bandgap semiconductor ZnO requires a high-temperature or ultraviolet-light illumination condition for excitation, and the high temperature or ultraviolet light will increase energy consumption and accelerate component aging. This paper reports the method of deposition of ZnO1-x gas-sensitive coatings by atmospheric plasma spraying. With the optimization of hydrogen flow rate in plasma forming gas, the ZnO i coatings can be directly deposited by a typical atmospheric plasma spraying process. Under the illumination of visible light, the as-sprayed ZnO(1-x )gas sensors achieved room temperature responses to ppb-level NO2. The best hydrogen flow rate for atmospheric plasma sprayed ZnO1-x coatings was found to be 7 L/min, and the H-7-ZnO1-x sensor exhibited the best gas sensing performance under blue light illumination. In addition, the enhanced effects of oxygen vacancies on optical and gas sensing properties were also discussed.
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