Synthesis of Nano Crystalline TiO2 powders by soft chemistry method
M. Vijayakumar, M. Venkateswarlu and N. Satyanarayana
pondicherry university, IN
sol-gel process, nanocrystalline TiO2, XRD, FTIR, DSC
Titanium dioxide (TiO2) is an important material and has many applications, Sol-gel process has many advantages over conventional preparative methods. In the present work, the advantages of the sol-gel process has been exploited and prepared nanocrystalline Titanium dioxide (TiO2) powders. Analytical grade precursor chemicals of TiCl4 was diluted with ice cooled distilled water and 200ml ethanol under continues stirring in ice bath, is labeled A. 1.7M urea was dissolved in 100ml water is labeled B. Solutions A and B are mixed under continues stirring at the boiling temperature to removing an alcohol. The phase and the structural evaluation of the heat treated gel were monitoring respectively by XRD and FTIR techniques. The average crystallize size obtained from XRD data is found to be ~9 nm. Using the Scherrer equation, D=kλ/βcosθ.
Fig. 2 shows the FTIR spectra of the heat treated gel at 473K and 523K. the observed IR band positions revealed the formation of TiO2 structure and also the removal of water molecules. The observed endothermic DSC curve of the gel sample, shown in Fig 3, also confirms the removal of water molecules. Hence, the observed XRD, FTIR and DSC results confirmed the formation of nanocrystalline TiO2 structured powder. Detailed results will be presented and discussed.
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Nanotech 2006 Conference Program Abstract