Preparation, characterization and properties of thermochromic tungsten-doped vanadium dioxide by thermal reduction and annealing

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• 作者：Junwei Ye ; Li Zhou ; Fengjuan Liu ; Ji Qi ; Weitao Gong ; Yuan Lin ; Guiling Ning
• 关键词：Vanadium oxide ; Tungsten ; Doping ; Thermal reduction
• 刊名：Journal of Alloys and Compounds
• 出版年：2010
• 出版时间：20 August 2010
• 年：2010
• 卷：504
• 期：2
• 页码：503-507
• 全文大小：343 K

文摘

Thermochromic tungsten-doped vanadium dioxide (VO₂) powders were successfully synthesized by thermal reduction using V₂O₅ 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 VO₂ matrix, and prepared tungsten-doped VO₂ 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 VO₂ 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 °C from initial 69.5 °C, suggesting that tungsten-doped VO₂ 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.