The 1:1 or 1:5 metal/polymer ratios, as well as the nature of the polymer in the macromolecular precursors (Chitosan)center dot(AuCl3)(n)center dot(SiO2)(m) and (PS-co-4-PVP)center dot(AuCl3)(n)center dot(SiO2)(m) influences the dispersion of the Au degrees nanostructures inside SiO2 matrix. The results are compared with those previously obtained for bimetallic composites Au/Ag//SiO2. A formation mechanism of the Au degrees/SiO2 and Ag degrees/SiO2 composites involving the combustion of the organic matter and the growth of the Au degrees and Ag degrees nanoparticles inside the holes, generated from the combustion process, is proposed.