Structural characterization and optical property of TiO2powders prepared by the sol-gel method

Y. F. You, C. H. Xu, S. S. Xu, S. Cao, J. P. Wang, Y. B. Huang, San-Qiang Shi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

62 Citations (Scopus)

Abstract

The structural characteristics and optical property of TiO2powders with different phases are studied by various techniques in this paper. Butyl titanate and oxalic acid were used as Ti source and catalyst, respectively, for sol-gel synthesis of TiO2powders. The synthesized products were characterized by X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, thermogravimetric analysis and photoluminescence techniques. X-ray diffraction patterns confirm TiO2phase transformation from amorphous to anatase and rutile with the increase in calcination temperatures from 200 °C to 700 °C. Two exothermic peaks at 275 °C and 485 °C on the differential scanning calorimetry curve are responsible for the decomposition of the oxalate groups, which can enhance TiO2phase transformation from amorphous to anatase and rutile. The crystalline sizes of the synthesized TiO2powders are in the range of 20-65 nm. The coherent phase boundary between (200) crystal plane of anatase and (11-2) crystal plane of rutile is determined first time, based on the Fourier transform analysis. The near band edge emission peaks of anatase at 396 nm and rutile at 419 nm, and four peaks of the different defects in TiO2crystals can be identified on the photoluminescence spectra of the synthesized TiO2powders. The activation energies for the grain growths of anatase and rutile were calculated, indicating that the surface chemistry may be a critical parameter to control grain growth. Based on the experimental results, the mechanism for the formation of anatase and rutile TiO2is discussed.
Original languageEnglish
Pages (from-to)8659-8666
Number of pages8
JournalCeramics International
Volume40
Issue number6
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • A. Sol-gel processes
  • B. Grain boundaries
  • C. Optical properties

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this