Controlled Growth of Sonochemically Synthesized Gold Seed Particles in Aqueous Solutions Containing Surfactants

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Contents Vol 58(9)

doi:10.1071/CH05115

Controlled Growth of Sonochemically Synthesized Gold Seed Particles in Aqueous Solutions Containing Surfactants

Kenji Okitsu ^A ^B, Boon Mian Teo ^B, Muthupandian Ashokkumar ^B ^C, Franz Grieser ^B

^A Graduate School of Engineering, Osaka Prefecture University, Osaka 599-8531, Japan.
^B School of Chemistry, University of Melbourne, Melbourne VIC 3010, Australia.
^C Corresponding author. Email: masho@unimelb.edu.au





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Australian Journal of Chemistry 58(9) 667–670 http://dx.doi.org/10.1071/CH05115
Submitted: 11 May 2005 Accepted: 21 June 2005 Published online: 21 September 2005

Abstract

Gold seed particles stabilized by citric acid were prepared by the sonochemical reduction of Au(iii) ions in aqueous solutions. These seed particles were grown by the reduction of adsorbed Au(iii) ions by ascorbic acid in aqueous solutions containing cationic surfactants, dodecyltrimethylammonium bromide (C₁₂TAB), hexadecyltrimethylammonium bromide (C₁₆TAB) and didodecyldimethylammonium bromide (DDDAB). The rate of reduction of Au(iii) ions during the seed-growth process was found to be strongly dependent upon the type and concentration of the cationic surfactants. The presence of Ag(i) in the growth solution containing DDDAB affected the size distribution of the gold particles.