Journal
NANO LETTERS
Volume 13, Issue 5, Pages 2163-2171Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl400653s
Keywords
Gold nanorods; CTAB; surfactant mixture; CTAC; electron microscopy; symmetry breaking
Categories
Funding
- Office of Naval Research (ONR) Multidisciplinary University Research Initiative (MURI) on Optical Metamaterials [N00014-10-1-0942]
- U.S. Department of Energy (DOE) Office of ARPA-E [DEAR0000123]
- MRSEC program of the National Science Foundation [DMR 11-20901]
- DOE Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0002158]
- NSF-IGERT program [DGE-0221664]
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DE AC02-05CH11231]
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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 mu M 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.
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