Oxygen vacancy induced structural phase transformation in TiO2 nanoparticles

Chandana Rath, P. Mohanty, A. C. Pandey, N. C. Mishra

Research output: Contribution to journalArticlepeer-review

202 Citations (Scopus)

Abstract

Nanosize TiO2 powders prepared by the sol-gel technique at pH of precipitation 4.5 and 6.5 show the anatase phase after calcining at 500 °C. Anatase to rutile phase transformation (ART), however, occurs at 650 °C in the case of pH 6.5 while 850 °C is found to be the ART temperature for the lower pH sample. pH of precipitation dependent ART temperature has not been reported so far to the best of our knowledge. It is known that the smaller the particle size, the lower the ART temperature, and vice versa. The observation of higher crystallite size and lower ART temperature in the case of the higher pH sample contradicts the reported result. We realized from x-ray photoelectron spectroscopic studies that oxygen vacancy concentration drives the ART temperature to lower values in the higher pH sample compared with the sample synthesized at lower pH; even the particle size is found to be higher in the former one.

Original languageEnglish
Article number205101
JournalJournal Physics D: Applied Physics
Volume42
Issue number20
DOIs
Publication statusPublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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