Solvothermal synthesis and characterization of tungsten oxides with controllable morphology and crystal phase

Jing Xiao Liu, Xiao Li Dong, Xiang Wen Liu, Fei Shi, Shu Yin, Tsugio Sato

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Tungsten oxides with various morphologies and crystal phases were synthesized by solvothermal reactions at 200 °C for 7-12 h using different solvents. The morphology and crystal phase of tungsten oxides changed depending on the solvents, i.e., spherical particles of ca. 1 μm in diameter consisting of nanowires, spindle shaped bundles of ca. 1 μm in length consisting of nanowires and accumulations consisting of micrometer sized plates and/or rods of tungsten oxides were obtained using ethanol, 1-propanol and water-ethanol mixed solution, respectively. When water-ethanol mixed solution was used, the crystallinity of tungsten oxide increased but the specific surface area greatly decreased. Crystallinity of tungsten oxides had more important effects on the NO degradation under light irradiation. The product using 42.9 vol.% water-ethanol mixed solvent consisted of the mixture of anhydrous tungsten oxide and hydrous tungsten oxide with preferential orientation of (0 0 2) plane and small band gap energy (2.43 eV), and showed higher photocatalytic degradation of NO even though it had a much smaller specific surface area than those prepared using ethanol and 1-propanol.

Original languageEnglish
Pages (from-to)1482-1488
Number of pages7
JournalJournal of Alloys and Compounds
Volume509
Issue number5
DOIs
Publication statusPublished - 2011 Feb 3

Keywords

  • Chemical synthesis
  • Optical properties
  • Oxide materials
  • Scanning electron microscopy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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