期刊
APPLIED SURFACE SCIENCE
卷 400, 期 -, 页码 440-445出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2016.12.221
关键词
Zn2SnO4-ZnO; Microwires; Hydrogen; Gas sensor; Sensing mechanism
类别
资金
- National Natural Science Foundation of China [51422402, 51674067]
- Fundamental Research Funds for the Central Universities [N140105002, N150101001]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20130042120033]
Ultra-long Zn2SnO4-ZnO microwires were synthesized by thermal evaporation of the mixture of SnO2, ZnO and C powders. Microstructural characterization by means of X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy showed that Zn2SnO4-ZnO microwires with excellent crystallinity were 2.8-3.2 mu m in diameter and 4.0-4.2 mm in length. The maximal length-to-diameter ratio of Zn2SnO4-ZnO microwires is approximately 1500. H-2 sensing properties showed that Zn2SnO4-ZnO microwires exhibited not only excellent reversibility to H-2, but also a good linear relationship between the sensor response and H-2 concentration. The response time and recovery time decreased as the operating temperature increased. The highest sensor response of 9.6 to 1000 ppm H-2 was achieved at an operating temperature of 300 degrees C. The electron depletion theory was used for explaining H-2 sensing mechanism by the chemical adsorption and reaction of H-2 molecules on the surface of Zn2SnO4-ZnO microwires. (C) 2016 Elsevier B.V. All rights reserved.
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