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High-performance gas sensors based on the WO3-SnO2 nanosphere composites.
- Source :
-
Journal of Alloys & Compounds . Apr2019, Vol. 782, p789-795. 7p. - Publication Year :
- 2019
-
Abstract
- Abstract WO 3 -SnO 2 nanosphere (NS) composites with different structures and morphologies are successfully synthesized by a facial hydrothermal method. Two kinds of gas sensors were fabricated from WO 3 -SnO 2 NS composites of hollow structure with average diameter of 360 nm and solid structure with average diameter of 42 nm by varying the synthesis temperature. The as-prepared composites were annealed at 500 °C for 4 h in atmosphere before the characterization and sensing performance test. The crystalline structures, morphologies and surface compositions of the annealed WO 3 -SnO 2 NS composites are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photo-electron spectroscopy (XPS) techniques, respectively. The results of gas sensing tests show that WO 3 -SnO 2 NS composites with hollow structure exhibit the superior sensing behavior, including sensitivity, response-recovery rate and selectivity, as compared to the composites with solid structure. The WO 3 -SnO 2 NS composites presented in this work shows a high sensitivity, fast response and selectivity towards acetone. The surface conductivity changes of WO 3 -SnO 2 NS induced by the surface gas adsorption and desorption is proposed to responsible for the corresponding sensing behaviors. The WO 3 -SnO 2 NS composites with hollow structure presented in this study have potential practical applications in the field of gas sensor devices. Highlights • WO 3 -SnO 2 nanospheres are synthesized by the hydrothermal method. • WO 3 -SnO 2 of hollow structure demonstrates the superior sensing behaviors. • WO 3 -SnO 2 nanospheres show the higher response toward acetone. • The sensing mechanism caused by the adsorption and desorption. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 782
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 134687899
- Full Text :
- https://doi.org/10.1016/j.jallcom.2018.12.178