Studies On The Preparation Of W-doped Nanometer VO₂ Powder And The Properties Of Its Phase Transition

VO₂ is a kind of oxide which is provided with characteristic of phase change at 68℃. VO₂ has the property of metal-to-semiconductor change. VO₂ has properties of electrical and optical sudden change at the temperature of the phase transition. Because of this kind of characteristic, VO₂ has good application prospects in numerous fields, such as building's solar temperature-control windows, laser protecting membrane, infrared detector, optical data storage material and so on. Many studies have shown nano-class VO₂ powder can significantly reduce the stress of the phase transition. Its resistance mutations rate and optical transnittane will diminish with the size of the increase of nano-VO₂ powder. Compared with the membrane material, nano-VO₂ powder has broader application areas, and thus become the concern of researchers.In this paper, W-doped, F-doped and W- and F- doped precursor are prepared by the use of the way of the wet chemical. And then W-doped, F-doped and W- and F- doped nanometer VO₂ powder are prepared by the use of the way of the thermal decomposition. At the same time the processes of precursor thermal decomposition, nano-VO₂ powder's appearance, structural characteristics, changes in the structure and change of electronic energy level are analysed by the use of thermal analysis technology, XRD, TEM and XPS. Through real-time measurement of temperature-resistance...