Abstract

A chemical vapor condensation (CVC) process using the pyrolysis of metal-organic precursors was applied to produce the nanosized WO_3 powders. Morphology and phase changes of the synthesized WO_3 powder as a function of CVC parameters were investigated by XRD, BET and TEM. The agglomerated nanosized monoclinic WO_3 powders with nearly spherical shape and 10-38 nm in mean diameter could be obtained. Conditions to produce the WO_3 nanopowders are presented in this paper.

• Keywords: Chemical vapor condensation;WO_3 nanopowders;Gas sensing materials;