Synthesis and characterization of WO3 nano-powder based on micro-reactor in microemulsion system

WO3 nano-powder was synthesized by micro-reactor method in CTAB/n-butyl alcohol/n-octane/H2O microemulsion system using sodium tungstate and hydrochloric acid as reactants. Structure and properties of WO3 nano-powder were characterized by X-ray diffractometer, transmissive electron microscopy and UV-VIS. It is shown that the particle sizes, topography of the particles and phase structures of WO3 nano-powder are changed with moisture content in the microemulsion system, calcination temperatures and different reactants. The sizes of WO3 nano-powder increase with moisture content in the microemulsion system and calcination temperatures increasing. The sizes of WO3 particles obtained from ammonium tungstate as reactant are smaller than that with sodium tungstate as reactant.