Fabrication of transition temperature controlled W-doped VO2 nano particles by aqueous solution

Abstract

Non-doped and W doped VO2 powders with nanometer size were synthesized using vanadium oxyisopropoxide and/or tungsten sources with H2O2, subsequently by drying and heat-treatment the resulting powder at 400°C for 4 h in H2/Ar atmosphere. Tungsten pentaetoxide and tungsten chloride were used as tungsten sources. The primary particle sizes of the resulting non-doped VO2 and W doped VO2 powder were sub-tens nm. The transition temperature of the non-doped VO2 was 67.5°C, and that of W doped VO2 using tungsten pentaetoxide and tungsten chloride precursor solutions were 40.4 and 31.2°C, respectively.