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    STUDIA PHYSICA - Ediţia nr.2 din 2009  
         
  Articol:   NANOSIZE EFFECT IN TiO2 POROUS NANOSTRUCTURES.

Autori:  D. GEORGESCU, L. BAIA, S. SIMON. 		 
       
         
  Rezumat:  Structural properties of TiO2 nanostructured porous materials are studied by using Raman spectroscopy and X-ray diffraction (XRD). TiO2 aerogels have been thermally treated at temperatures ranging between 400 and 525°C, where anatase crystalline phase was found. Different aerogel nanoarchitectures made up from nanoparticles with mean size between 7.62 and 12.87 nm, as obtained from XRD, have been further investigated by Raman spectroscopy. It was found that the intensity, position, full width at half maximum (FWHM) and asymmetry of the most intense TiO2 anatase Raman bands, i.e. 144 and 638 cm-1, are influenced by nanoparticles dimension. These spectral changes were discussed in terms of nanosize effect. This effect was found to be more pronounced for the smallest nanoparticles.

Keywords: TiO2 aerogel, nanosize effect, Raman spectroscopy, XRD 		 
         
     
         
         
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