Ultrasensitive ppb-level NO2 gas sensor based on WO3 hollow nanosphers doped with Fe

[Display omitted] •Mesoporous WO3 hollow nanospheres with different amount of Fe dopant were synthesized.•Fe doping results to the smaller cell parameter, some defects and more oxygen vacancies.•WO3 with 5.2% Fe exhibited excellent low ppb-level NO2 detecting performance and outstanding selectivity....

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Bibliographic Details
Published in:Applied surface science 2018-03, Vol.434, p.891-897
Main Authors: Zhang, Ziyue, haq, Mahmood, Wen, Zhen, Ye, Zhizhen, Zhu, Liping
Format: Article
Language:English
Subjects:
Fe-WO3
Gas sensor
Low ppb-level
NO2
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Summary:[Display omitted] •Mesoporous WO3 hollow nanospheres with different amount of Fe dopant were synthesized.•Fe doping results to the smaller cell parameter, some defects and more oxygen vacancies.•WO3 with 5.2% Fe exhibited excellent low ppb-level NO2 detecting performance and outstanding selectivity. WO3 mesoporous hollow nanospheres doped with Fe synthesized by a facile method have mesoporous hollow nanospherical like morphology, small grain size (10nm), high crystalline quality and ultrahigh surface area (165m2/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 (10ppb) NO2 detecting performance and outstanding selectivity.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2017.10.074