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A. K. TROKHIMCHUK, A. V. LEGENCHUK, V. I. PODOLSKAYA, E. Yu. VOYTENKO, V. S. OVECHKO, and A. V. SHCHUR
«The Formation of Noble Metal Nanoparticles in Porous Silicas and Biological Matrixes»
509–528 (2008)

PACS numbers: 73.20.Mf, 81.07.-b, 81.16.-c, 82.70.-y, 82.80.-d, 83.80.-k, 87.64.-t, 87.83.+a

So-called cold and hot methods of the colloidal-gold formation in porous matrix of silica gels modified with propylallylthiourea and mercaptopropyl groups, and also combined chemical-microbiological method of the formation of colloidal silver within the cells of microorganisms are proposed. As revealed by the spectrum analysis, at the formation by the cold method, the separate nanoparticles with the size less than 1 nm are formed in the silica gel. The majority of reduced gold did not take part in phase formation. After the treatment at 600?, the size of gold particles in the composite material is 3.99 nm. Nanoparticles with average size of 1.61.7 nm are formed within the yeast cells, which have thick cellular wall. Larger particles of silver, which have average size of 2.142.47 nm, are formed in the matrix of bacilli, pseudomonades and colibacilli. The content of silver in biocomposite material is 4855 mg/g. The method for double-modal approximation of the plasmon resonance for the suspension of metallic nanoparticles is proposed and experimentally realized. The presented method has been used for an estimation of sizes and concentration of nanoparticles in two-component suspension, which consists of fine- and coarse-dispersed fractions.

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