In this study, we suggest an original method for synthesizing Fe₃O₄ and Fe₂O₃ nanoparticles localized on the surface silica nanoparticles. Iron oxide nanoparticles were prepared via precipitation from inverse suspensions containing silica modified with amino groups in the argon atmosphere under vigorous stirring at 40°C with further heating to 60°C. The modification of the silica was realized via interaction of surface silanol groups with γ-aminopropyltriethoxy silane at a mild condition in the toluene media. The size distribution and composition of the Fe-containing nanoparticles in the samples produced were investigated by means of TEM and XRD. Synthesis of silver nanoparticles was carried out in result of interaction between silver nitrate solution and silica modified with functional groups that possess reducing properties. After reduction procedure silica with attached to surface silver particles or in mixture were dried at 20 or 120 °C. Obtained composites were studied by UV-Vis spectra. On Figure the UV-spectra of ferric oxide (1-3) and silver (4) particles synthesized in the presence of modified silica are represent. Curve 5 corresponds to modified silica without metal. Presence of surface plasmon band in visible region at 400 nm provided evidence for silver nanoparticles formation.

This work was partial finance supported by the Russian Foundation for Basic Research (grant nos. 06-03-72031-MSTI, 07-03-00885, 07-08-00523, 08-03-00681, 08-08-90250), INTAS-05-1000008-7834, the grant of the President of the Russian Federation MK- 253.2007.3, Russian Science Support Foundation, ISTC nos. 3457, the Russian Academy of Sciences of the research programs «Development of methods for synthesis of chemical substances and creation of new materials» and «Creation of effective methods of the chemical analysis and investigations of structure of substances and materials».

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