Preparation of W doped VO2 nanopowders by coprecipitation

摘要

According to molar percentages of W6+ and V4+, 1, 2 and 3 at.-%W6+ respectively was added into VOSO4 solution in the process of hydrolysing VOSO4 and coprecipitation was formed. The W doped VO2 nanopowders were produced through heating the deposition at 500°C under highly pure argon atmosphere for 5 h. Powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC) have been used to characterise structure composition morphology and transition phase temperature. It was found that W6+ was actually doped into VO2 nanopowders and the transition temperature was reduced to almost 35˙7°C by doped 3 at.-%W6+. The average size of samples was in the range of 20-30 nm.