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, Suk Woo Nam, Hong Shik Lee, Joo Hoon Park, Sun Choi, Youhwan Shin

Research output: Contribution to journalArticlepeer-review

12 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

Keywords

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

ASJC Scopus subject areas

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

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