Oxygen partial pressure effect on the preparation of nanocrystalline tungsten oxide powders by a plasma arc gas condensation technique

Cherng Yuh Su, Chung Kwei Lin, Tsung Kun Yang, Hsuan Ching Lin, Cheng Tang Pan

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In the present study, nanocrystalline tungsten oxide powders were prepared by a plasma arc gas condensation technique under a controlled oxygen environment with Ar/O2 ratio ranged from 1/1 to 100/1. It is noted that stoichiometric tungsten oxide nanocrystalline powders (WO3) can be prepared under an Ar/O2 ratio ranged from 1/1 to 99/1, while nonstoichiometric tungsten oxide nanopowders (WO3-x) were synthesized under an Ar/O2 ratio of 100/1. The as-prepared WO3 powders were examined by X-ray diffraction (XRD), Raman scattering, thermal gravimetric analysis (TGA), and high-resolution transmission electron microscope (HRTEM). Experimental results showed that yellowish WO3 nanopowders prepared using different Ar/O2 ratio exhibited slight differences.

Original languageEnglish
Pages (from-to)423-428
Number of pages6
JournalInternational Journal of Refractory Metals and Hard Materials
Volume26
Issue number5
DOIs
Publication statusPublished - Sep 2008
Externally publishedYes

Keywords

  • Gas condensation
  • HRTEM
  • Nanocrystalline powders
  • Nanorods
  • Plasma arc
  • Tungsten oxide

ASJC Scopus subject areas

  • Metals and Alloys

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