Process for the preparation of nanoscale fiber tungsten oxide
The influence of tungsten oxide nano-sized fibers and tubes synthesis conditions on their phase composition and microstructure was studied with XRD and SEM methods. It was stated that tungsten oxide fibers formation results from the interaction in the powder blend consisted of 8,5…13 μm large-scale tungsten particles and 50…90 nm nano-scale cupper particles which have a thin oxide layer on the surfaces. The epitaxial growth of the fibers happens in vacuum at the temperature between 900 - 1100 °С. Application of nano-scale tungsten particles and large-scale cupper particles don't allow producing nano-sized fibers and tubes. Tungsten oxide nano-sized fibers and tubes nucleation starts at the moment of cupper nanoparticles melting. The dependence between tungsten oxide nano-sized fibers microstructure and synthesis conditions is revealed.