Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 2, Pages 2579-2585Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.11.064
Keywords
WO3; Hydrothermal; Surface-control; CO; Gas sensor
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Funding
- National Natural Science Foundation of China [U1404203]
- Program for Innovative Research Team of Science and Technology in the University of Henan Province [16IRTSTHN003]
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Hollow cauliflower-like hexagonal WO3 and cuboid-like orthorhombic WO3 nanostructures were successfully synthesized via a simple hydrothermal method with the assistance of different surfactants. The products were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The possible formation mechanisms of the different WO3 morphologies were proposed and the gas sensing properties were also investigated. Our research indicated that the different morphology and crystal phase were crucial for the dissimilarity of the gas sensing performance. The novel cauliflower-like WO3 sensor exhibited excellent CO sensing properties at 270 degrees C with higher and faster response, which may benefit from the hollow porous structure and the (001) reactive surfaces of the hexagonal phase. The sensing mechanism was discussed.
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