Preparation of Nanosized Tungsten and Tungsten Oxide Powders

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 tu...

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Bibliographic Details
Published in:Physics of the solid state 2018-12, Vol.60 (12), p.2634-2639
Main Authors: Abdullin, Kh. A., Azatkaliev, A. A., Gabdullin, M. T., Kalkozova, Zh. K., Mukashev, B. N., Serikkanov, A. S.
Format: Article
Language:English
Subjects:
AEROSOLS
AMMONIUM TUNGSTATES
Coated electrodes
Electric properties
HYDROGEN
Low-Dimensional Systems
Morphology
NANOPARTICLES
NANOPOWDERS
NANOSCIENCE AND NANOTECHNOLOGY
NANOSTRUCTURES
Oxide coatings
Physics
Physics and Astronomy
Powders (Particulate matter)
PYROLYSIS
SCANNING ELECTRON MICROSCOPY
Solid State Physics
SPECTROSCOPY
SYNTHESIS
Thermal reduction
THIN FILMS
TUNGSTEN
Tungsten compounds
TUNGSTEN OXIDES
VOLTAMETRY
X-RAY DIFFRACTION
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Summary: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.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783419010025