Harish, S. and Sabarinathan, R. and Joseph, J. and Phani, K.L.N. (2011) Role of pH in the synthesis of 3-aminopropyl trimethoxysilane stabilized colloidal gold/silver and their alloy sols and their application to catalysis. Materials Chemistry and Physics, 127. pp. 203-207. ISSN 0254-0584

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Abstract

A general method for the synthesis of nano-alloy dispersions of noble metals like Au and Ag in organically modified aminosilicate sol is presented with an emphasis on the influence of pH on the sol stability. The alloys of Au–Ag were synthesized by co-reduction of solutions of gold and silver salts using borohydride as the reducing agent at a suitable pH in the medium containing 3-aminopropyltrimethoxysilane (APS) stabilizer. Organosilanes with amine functional group have multiple roles in the formation of stable sols such as the formation of siloxane network structures by hydrolysis and condensation and the interaction of amino group with metal ions in solution electrostatically.Monometal and alloy sols were characterized by transmission electron microscopy (TEM), ultraviolet–visible (UV–vis) spectroscopy. The stable alloy sols were found to catalyze the chemical reduction of 4-nitrophenol to 4-aminophenol and the catalytic rate constants were evaluated from UV–vis spectroscopy

Item Type:	Article
Uncontrolled Keywords:	Sol–gel growth; Nanostructures; Alloys
Subjects:	Electrodics and Electrocatalysis
Divisions:	UNSPECIFIED
Depositing User:	ttbdu cecri
Date Deposited:	19 Nov 2012 08:34
Last Modified:	19 Nov 2012 08:34
URI:	http://cecri.csircentral.net/id/eprint/2915

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