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Indexed by:期刊论文

Date of Publication:2010-08-20

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI、Scopus

Volume:504

Issue:2

Page Number:503-507

ISSN No.:0925-8388

Key Words:Vanadium oxide; Tungsten; Doping; Thermal reduction

Abstract:Thermochromic tungsten-doped vanadium dioxide (VO(2)) powders were successfully synthesized by thermal reduction using V(2)O(5) as a vanadium precursor. The products were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results indicated that W was successfully doped into the crystal lattice of VO(2) matrix, and prepared tungsten-doped VO(2) had a rod-like morphology. The effects of reducing temperature and annealing temperature on the crystallographic structures were also discussed. The phase transition temperature (Tt) of VO(2) could be simply tuned by changing the doping concentration of tungsten. When the doping concentration was 1.58 mol%, the Tt could be reduced to 37.8 degrees C from initial 69.5 degrees C, suggesting that tungsten-doped VO(2) possesses prominent thermochromic properties and optical switching characters. It has shown that this convenient and efficient approach could be applied in the mass-production of functional powders materials. (C) 2010 Elsevier B.V. All rights reserved.