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Cooperative interactions among CTA^+, Br^-and Ag^+ during seeded growth of gold nanorods
Ist Teil von
Nano research, 2017-06, Vol.10 (6), p.2146-2155
Ort / Verlag
Beijing: Tsinghua University Press
Erscheinungsjahr
2017
Quelle
SpringerNature Journals
Beschreibungen/Notizen
We have carried out a comprehensive study on the formation mechanism of Au nanorods (AuNRs) in binary surfactant mixtures composed of quaternary ammonium halide and sodium oleate (NaOL). We identify the cetyltrimethyl ammonium (CTA)-Br-Ag^+ complex as the key ingredient in directing the anisotropic growth of AuNRs. Based on the improved understanding of the cooperative interactions among CTA^+, Br^- and Ag^+, we further demonstrate that AgBr, which is readily solubilized by the cetyltrimethyl ammonium bromide (CTAB) or cetyltrimethyl ammonium chloride (CTAC) micelles, can be employed as the combined source of Ag^+ and Br^- for the preparation of AuNRs. The growth of high-quality AuNRs can be completed within 15 min under extremely low bromide content (0.1 mM).