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    STUDIA PHYSICA - Issue no. 2 / 2010  
         
  Article:   SYNTHESIS AND MORPHO-STRUCTURAL ANALYSIS OF TIO2-AU COMPOSITES.

Authors:  G. MELINTE, L. BAIA, V. DANCIU, M. BAIA.
 
       
         
  Abstract:  Several nanocomposites based on TiO2 aerogel and Au colloidal nanoparticles have been successfully obtained through different synthesis methods. For the purpose of obtaining the desired TiO2 anatase phase, the samples underwent a certain heat treatment. The porous-like structure of all the nanocomposites has been observed by scanning electron microscopy (SEM). Quantitative values of the specific surface areas of the pores have been determined by using N2 adsorption method. The sample with the highest specific surface area was synthesized by impregnating the TiO2 gel with gold colloid. This result is very promising for photocatalytic testing knowing that the anatase crystalline phase, which builds up the structure of this sample, enhances the photocatalytic activity. The existence of Au nanoparticles inside the porous network was found to influence the dimensions of the TiO2 crystallites. The mean size of the anatase nanocrystals has been determined from the Raman-XRD data correlation for all of the investigated samples and the values were confirmed by transmission electron microscopy (TEM) results.

Keywords: TiO2 aerogel, Au colloidal particles, nanocomposites, morphological and structural analysis. 

 
         
     
         
         
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