期刊
APPLIED SURFACE SCIENCE
卷 434, 期 -, 页码 891-897出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2017.10.074
关键词
Fe-WO3; Gas sensor; NO2; Low ppb-level
类别
资金
- National Natural Science Foundation of China [51372224, 51572239]
- Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- Cyrus Tang fund for Sensor Materials and Applications
WO3 mesoporous hollow nanospheres doped with Fe synthesized by a facile method have mesoporous hollow nanospherical like morphology, small grain size (10 nm), high crystalline quality and ultrahigh surface area (165 m(2)/g). XRD spectra and Raman spectra indicate the Fe doping leading to the smaller cell parameters as compared to pure WO3, and the slight distortion in the crystal lattice produces a number of defects, making it a better candidate for gas sensing. XPS analysis shows that Fe-doped WO3 mesoporous hollow nanospheres have more oxygen vacancies than pure WO3, which is beneficial to the adsorption of oxygen and NO2 and its surface reaction. The gas sensor based on Fe-WO3 exhibited excellent low ppb-level (10 ppb) NO2 detecting performance and outstanding selectivity. (C) 2017 Elsevier B.V. All rights reserved.
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