Davydenko N. Synthesis and physico-chemical properties of the composites of polyaniline and thiol-modified silver particles

A comparative study of morphology and physico-chemical properties of silver parti-cles prepared by chemical reduction of Ag+ ions with the use of "green synthesis" method, with using of NaBH4 and in cementation reaction on metallic copper was carried out. It has been found that all above mentioned methods provide the possibility to generate the nanosized silver particles, however in a case involving the use of strong reductant and the cementation method, the aggregation of initial nanosized silver particles into aggregates of 0.5-8.0 µm size occurs depending on synthesis conditions and the nature of modifying/ stabilizing agent. Using of the mercaptoaniline bifunctionality the "grafting from" approach has been proposed and realized for secondary modification of dispersed silver particles both chemical and electrochemical ways. As a result of oxidative polymerization of aniline in the presence of primary modified by self-organized covalently bonded layer of mercaptoanilines silver particles, the growth of PAn chain, which are grafted to the metal surface via sulfide bridge, takes place. 3-Mercaptoaniline was found to be the most effective modifier of the silver surface, which provides the highest bonding strength of layer attached to the surface. The perspectives of synthesized composites application as platforms for amperometric biosensor for glucose and hydrogen peroxide detection have been defined.