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Synthesis of Au nanoparticles. Typically, 20 ml of 5 mM HAuCl4 aqueous solution was mixed with 10 ml of 25 mM TOAB in toluene. After the Au precursor was transferred to the toluene layer, the toluene layer was mixed with 0.202 g dodecylamine in 5ml toluene. Then, 0.054 g NaBH4 in 3 ml H2O was added to the mixture with vigorous stirring. The mixture turned brown indicating the formation of Au nanoparticles. Au nanoparticles were precipitated from toluene by adding ethanol followed by centrifugation. The nanoparticles were redispersed in 10
ml hexane. For this particular procedure, the Au nanoparticles were about 3 nm in diameter, with nearly spherical shape.
Nano Lett., 2006, 6 (4), pp 875¨C881
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