Preparation of Nanosized Tungsten and Tungsten Oxide Powders
- Authors: Abdullin K.A.1, Azatkaliev A.A.1, Gabdullin M.T.2, Kalkozova Z.K.1, Mukashev B.N.3, Serikkanov A.S.3
- 
							Affiliations: 
							- Al-Farabi Kazakh National University
- Kazakh-British Technical University
- Institute of Physics and Technology
 
- Issue: Vol 60, No 12 (2018)
- Pages: 2634-2639
- Section: Low-Dimensional Systems
- URL: https://journal-vniispk.ru/1063-7834/article/view/204654
- DOI: https://doi.org/10.1134/S1063783419010025
- ID: 204654
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Abstract
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.
About the authors
Kh. A. Abdullin
Al-Farabi Kazakh National University
							Author for correspondence.
							Email: kh.a.abdullin@mail.ru
				                					                																			                												                	Kazakhstan, 							Almaty						
A. A. Azatkaliev
Al-Farabi Kazakh National University
														Email: kh.a.abdullin@mail.ru
				                					                																			                												                	Kazakhstan, 							Almaty						
M. T. Gabdullin
Kazakh-British Technical University
														Email: kh.a.abdullin@mail.ru
				                					                																			                												                	Kazakhstan, 							Almaty						
Zh. K. Kalkozova
Al-Farabi Kazakh National University
														Email: kh.a.abdullin@mail.ru
				                					                																			                												                	Kazakhstan, 							Almaty						
B. N. Mukashev
Institute of Physics and Technology
														Email: kh.a.abdullin@mail.ru
				                					                																			                												                	Kazakhstan, 							Almaty						
A. S. Serikkanov
Institute of Physics and Technology
														Email: kh.a.abdullin@mail.ru
				                					                																			                												                	Kazakhstan, 							Almaty						
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