Получение наноразмерных порошков оксида вольфрама и вольфрама

Nanopowder tungsten oxide and metallic tungsten are obtained via pyrolysis of ammonium metatungstate. Two methods are used for the synthesis of tungsten oxide: the use of a fibrous matrix and pyrolysis of aerosol particles. Tungsten oxide particles are formed during the pyrolysis in air. Metallic tungsten nanoparticles are obtained via subsequent thermal reduction of tungsten oxide in hydrogen. The structure and morphology of the samples are studied with X-ray diffraction and scanning electron microscopy. Tungsten nanopowders with average sizes from 7 to 30 nm are obtained depending on synthesis temperature. The electrochemical characteristics of electrodes coated with tungsten nanoparticles are studied with cyclic voltammetry, impedance spectroscopy, and galvanostatic charge–discharge methods. An electrode with W nanoparticles exhibited a specific low-frequency capacitance of about 90 F/g due to thin tungsten oxide film on the surface of tungsten nanoparticles.

Ultra-large optical modulation of a size-tunable flexible electrochromic honeycomb mesoporous tungsten oxide film

A size tunable flexible electrochromic honeycomb mesoporous tungsten oxide film with ultra-large optical modulation is achieved by breath figure self-assembly of polymer-like ultrathin W18O49 nanowires.

Enhanced photoelectrochemical performance of tungsten oxide film by bifunctional Au nanoparticles

Proposed mechanism of the synergistic effect of SPR and inner electric field in the Au/WO3.