Preparation of Nanosized Tungsten and Tungsten Oxide Powders


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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.

作者简介

Kh. Abdullin

Al-Farabi Kazakh National University

编辑信件的主要联系方式.
Email: kh.a.abdullin@mail.ru
哈萨克斯坦, Almaty

A. Azatkaliev

Al-Farabi Kazakh National University

Email: kh.a.abdullin@mail.ru
哈萨克斯坦, Almaty

M. Gabdullin

Kazakh-British Technical University

Email: kh.a.abdullin@mail.ru
哈萨克斯坦, Almaty

Zh. Kalkozova

Al-Farabi Kazakh National University

Email: kh.a.abdullin@mail.ru
哈萨克斯坦, Almaty

B. Mukashev

Institute of Physics and Technology

Email: kh.a.abdullin@mail.ru
哈萨克斯坦, Almaty

A. Serikkanov

Institute of Physics and Technology

Email: kh.a.abdullin@mail.ru
哈萨克斯坦, Almaty

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