Role of ions in the colloidal synthesis of gold nanowires

T. K. Sau, C. J. Murphy

Research output: Contribution to journalArticle

Abstract

Gold nanocrystals of different shapes have been made by a wet chemical approach based on a two-step, seed-mediated synthesis. In this paper, we demonstrate a one-step synthetic method for achieving simple and systematic control over the shape of gold nanoparticles. Gold nanowires, which have been prepared by multi-step approaches, are produced in very high yield in this single-step technique. The width of the rods can be varied over a broader range compared to previously reported methods. Rectangle-, cube- or tetrapod-like gold nanocrystals can also be prepared in aqueous solution at room temperature. The formation of various shapes, in the presence of silver nitrate, requires bromide ion and alkylammonium surfactant ion of appropriate hydrocarbon tail length. The shape, dimension and yield of the nanocrystals depend on the nature and concentrations of the stabilizing cationic surfactants and other additives, such as salts, in addition to the reactants.

Original languageEnglish (US)
Pages (from-to)2143-2158
Number of pages16
JournalPhilosophical Magazine
Volume87
Issue number14-15
DOIs
StatePublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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