Journal
LANGMUIR
Volume 18, Issue 21, Pages 7831-7836Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la020276f
Keywords
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The reduction of AuCl4- to colloidal gold in the presence of aliphatic alcohols and sodium dodecyl sulfate in aqueous solutions using 20 kHz ultrasound is described. The extent of reduction of AuCl4- was found to be directly dependent on the gas-solution interfacial activity of the solutes used. The diameters of the gold colloids produced were in the size range of 9-25 nm. The particle size was dependent on the alcohol concentration in solution and on the hydrophobicity of the alcohol. For a particular alcohol concentration, smaller particles were obtained the greater the hydrophobicity of the alcohol. A detailed mechanism is presented that describes the overall sonochemically initiated reduction of AuCl4- leading to the formation of colloidal gold.
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