Microwave-assisted synthesis and characterization of Ti 1 - XVxO2 (x = 0.0-0.10) nanopowders

Luc Huy Hoang, Pham Van Hai, Pham Van Hanh, Nguyen Hoang Hai, Xiang Bai Chen, In Sang Yang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Ti1 - xVxO2 (x = 0.0-0.10) nanopowders were successfully synthesized by a microwave-assisted sol-gel technique and their crystal structure and electronic structure were investigated. The products were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman and UV-Vis spectroscopy. The results revealed that TiO2 powders maintained the anatase phase for calcination temperature below 600 °C, but gradually changed to the rutile phase above 800 °C. The formation of the rutile phase was completed at 1000 °C. For Ti 1 - xVxO2 (x = 0.05) powders, the phase transformation appeared at 600 °C. The absorption edge of Ti 1 - xVxO2 (x > 0) powders broadened to the visible region with increasing V concentration and a strong visible light absorption was obtained with 10% V doping. V doping and subsequent coexistence of both anatase and rutile phases in our Ti1 - xVxO 2 nanoparticles are considered to be responsible for the enhanced absorption of visible light up to 800 nm.

Original languageEnglish
Pages (from-to)3047-3050
Number of pages4
JournalMaterials Letters
Volume65
Issue number19-20
DOIs
StatePublished - Oct 2011

Keywords

  • Microwave-assisted synthesis
  • Photocatalysts
  • TiVO nanopowders

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