Facile one-pot synthesis of tungsten oxide (WO3-x) nanoparticles using sub and supercritical fluids

Minsoo Kim, Byung Yong Lee, Hyung Chul Ham, Jonghee Han, SukWoo Nam, Hong Shik Lee, Joo Hoon Park, Sun Choi, Youhwan Shin

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Tungsten oxide (WO3) and tungsten blue oxide (WO3-x) were synthesized using sub and supercritical water and methanol. Crystalline tungsten oxides were formed with subcritical water at 250°C, which shows lower production temperature compared to conventional solid-state methods. Glycerol hydrothermal reduction and supercritical methanol were both found to be effective in obtaining crystalline tungsten blue oxides and this is a great advantage since hydrogen is not required in the process. The synthesized particles were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and near edge X-ray absorption fine structure (NEXAFS). NEXAFS results showed that sub and supercritical methanol was more effective in reduction of tungsten oxides compared to glycerol hydrothermal reduction.

Original languageEnglish
Pages (from-to)8-13
Number of pages6
JournalJournal of Supercritical Fluids
Volume111
DOIs
Publication statusPublished - 2016 May 1
Externally publishedYes

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Keywords

  • Glycerol
  • Supercritical methanol
  • Supercritical water
  • Tungsten blue oxide
  • Tungsten oxide

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)
  • Condensed Matter Physics

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