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Evaluating the thermal treatment parameters effect on the anatase nano crystallites size of titania aero gels

L. BAIA1,* , M. BAIA1, A. PETER2, V. COSOVEANU2, V. DANCIU2

Affiliation

  1. Faculty of Physics, Babes-Bolyai University,400084 Cluj-Napoca, Romania
  2. Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, 400028 Cluj-Napoca, Romania

Abstract

A semi-empirical model is applied to investigate a series of TiO2 aerogels annealed at different temperatures. Specific information concerning the nature of the aerogels networks and correlations between the crystallites size and spectral features of the 144 cm-1 Raman band are obtained. Based on these findings the as prepared aerogels were heat-treated at different temperatures (400-700 °C) for various time intervals (1-5 h) and investigated in an attempt to optimize this type of nano-architectures for further experiments in which certain sizes of the TiO2 anatase nanocrystallites are required. The careful analysis of the three dimensional relationship between the crystallites mean size, the temperature and the time of the thermal treatment reveals that the most pronounced effect of these parameters on the anatase crystallites dimension appears for the aerogels annealed at 600 0C for different times, where the largest spread of the crystallites dimension occurs..

Keywords

TiO2 aerogels, Crystallites mean size, Raman spectroscopy, XRD.

Submitted at: Nov. 15, 2006
Accepted at: March 15, 2007

Citation

L. BAIA, M. BAIA, A. PETER, V. COSOVEANU, V. DANCIU, Evaluating the thermal treatment parameters effect on the anatase nano crystallites size of titania aero gels, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 3, pp. 668-671 (2007)