Journal
ACS NANO
Volume 6, Issue 3, Pages 2804-2817Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn300315j
Keywords
monodisperse; gold nanorods; CTAB; salicylic acid; self-assembly; superlattice; plasmonics
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Funding
- Office of Naval Research (ONR) Multidisciplinary University Research Initiative (MURI) on Optical Metamaterials [N00014-10-1-0942]
- DOE Office of ARPA-E [DE-AR0000123]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering [DE-SC0002158]
- Army Research Office (ARO) MURI [W911NF-08-1-0364]
- Richard Perry University
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We report an improved synthesis of colloidal gold nanorods (NRs) by using aromatic additives that reduce the concentration of hexadecyltrimethylammonium bromide surfactant to similar to 0.05 M as opposed to 0.1 M in well-established protocols. The method optimizes the synthesis for each of the 11 additives studied, allowing a rich array of monodisperse gold NRs with longitudinal surface plasmon resonance tunable from 627 to 1246 nm to be generated. The gold NRs form large-area ordered assemblies upon slow evaporation of NR solution, exhibiting liquid crystalline ordering and several distinct local packing motifs that are dependent upon the NR's aspect ratio. Tailored synthesis of gold NRs with simultaneous improvements in monodispersity and dimensional tunability through rational introduction of additives will not only help to better understand the mechanism of seed-mediated growth of gold NRs but also advance the research on plasmonic metamaterials incorporating anisotropic metal nanostructures.
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