Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7994454 | Journal of Alloys and Compounds | 2018 | 42 Pages |
Abstract
WO3-SnO2 nanosheet (NS) composites consisting of inner WO3 nanosheets surrounded by outer mixed phase SnO2 nanoparticles (NPs) were successfully synthesized by a simple two-step hydrothermal method. The density of SnO2 NPs on WO3 NSs can be controlled from sparse discrete state to complete shell structure by varying the amount of tin precursor. Apparent interface state density dependent gas sensing responses were observed for the WO3-SnO2 nanocomposites. The response of the WO3-SnO2 nanocomposites coated with complete SnO2 shell to 50Â ppm acetone vapor is as high as 32.1, â¼10 times higher than that of the pristine WO3 NS sensor, with a response time less than 2Â s. The improvement in response and selectivity of the WO3-SnO2 nanocomposite sensors upon exposure to acetone molecules can be mainly attributed to the multifunctional interfaces between WO3 NSs and SnO2 NPs, exposed special facets of WO3 NSs, core-shell type nanostructures as well as the special physical and chemical properties of acetone molecules.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Mingli Yin, Yao Yao, Haibo Fan, Shengzhong Liu,