Seeded growth of monodisperse gold nanorods using bromide-free surfactant mixtures

Xingchen Ye, Yuzhi Gao, Jun Chen, Danielle C. Reifsnyder, Chen Zheng, Christopher B. Murray

Research output: Contribution to journalArticlepeer-review

201 Scopus citations

Abstract

We demonstrate for the first time that monodisperse gold nanorods (NRs) with broadly tunable dimensions and longitudinal surface plasmon resonances can be synthesized using a bromide-free surfactant mixture composed of alkyltrimethylammonium chloride and sodium oleate. It is found that uniform gold NRs can be obtained even with an iodide concentration approaching 100 μM in the growth solution. In contrast to conventional wisdom, our results provide conclusive evidence that neither bromide as the surfactant counterion nor a high concentration of bromide ions in the growth solution is essential for gold NR formation. Correlated electron microscopy study of three-dimensional structures of gold NRs reveals a previously unprecedented octagonal prismatic structure enclosed predominantly by high index {310} crystal planes. These findings should have profound implications for a comprehensive mechanistic understanding of seeded growth of anisotropic metal nanocrystals.

Original languageEnglish (US)
Pages (from-to)2163-2171
Number of pages9
JournalNano letters
Volume13
Issue number5
DOIs
StatePublished - May 8 2013

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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