In this paper, we explored the preparation process of gold nanoclusters (AuNCs). AuNCs was synthesized by micro-reaction process and compared with the traditional one-pot strategy. The water-soluble AuNCs was prepared by reducing hydrogen tetrachloroaurate hydrate (HAuCl4) in aqueous solution with 11-mercaptoundecanoic acid (MUA) as ligand and reducing agent. The effect of NaBH4 and reactant concentration ratio on the experimental results was investigated systematically, and it was found that NaBH4 had little effect on the fluorescence intensity of synthesized AuNCs. When the ratio of MUA to Au~(3+) ion concentration was 4:1, the AuNCs reached the highest fluorescence intensity. The synthesized water-soluble AuNCs were characterized by ultraviolet spectrophotometer, fluorescence spectrophotometer and high resolution transmission electron microscopy (HRTEM). The average particles of AuNCs prepared by one-pot strategy and the micro-reaction method were 1.8nm ± 0.5nm, 1.7nm ± 0.4nm, respectively. The quantum yield of AuNCs prepared by micro-reaction method was improved to 9.1% comparing with the one-pot strategy of 6.9%.
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