Seed-mediated growth and manipulation of Au nanorods via size-controlled synthesis of Au seeds

Seed-mediated growth of gold (Au) nanorods with highly controllable length, width, and aspect ratio was accomplished via carefully size-controlled synthesis of the original Au seeds. A slow dynamic growth of Au nanoparticle seeds was observed after reduction of the Au salt (i.e., hydrogen tetrachlor...

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Bibliographic Details
Published in:Journal of nanoparticle research : an interdisciplinary forum for nanoscale science and technology 2012-12, Vol.14 (12), p.1-12, Article 1289
Main Authors: Liu, Juncheng, Duggan, Jennifer N., Morgan, Joshua, Roberts, Christopher B.
Format: Article
Language:English
Subjects:
Aging
Ammonium
Aspect ratio
Characterization and Evaluation of Materials
Chemistry and Materials Science
Gold
Inorganic Chemistry
Lasers
Materials Science
Nanocomposites
Nanomaterials
Nanoparticles
Nanorods
Nanostructure
Nanotechnology
Optical Devices
Optics
Photonics
Physical Chemistry
Research Paper
Seeds
Synthesis
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Summary:Seed-mediated growth of gold (Au) nanorods with highly controllable length, width, and aspect ratio was accomplished via carefully size-controlled synthesis of the original Au seeds. A slow dynamic growth of Au nanoparticle seeds was observed after reduction of the Au salt (i.e., hydrogen tetrachloroaurate (III) hydrate) by sodium borohydride (NaBH 4 ) in the presence of cetyltrimethyl ammonium bromide (CTAB). As such, the size of the Au nanoparticle seeds can therefore be manipulated through control over the duration of the reaction period (i.e., aging times of 2, 8, 48, 72, and 144 h were used in this study). These differently sized Au nanoparticles were subsequently used as seeds for the growth of Au nanorods, where the additions of Au salt, CTAB, AgNO 3 , and ascorbic acid were employed. Smaller Au nanoparticle seeds obtained via short growth/aging time resulted in Au nanorods with higher aspect ratio and thus longer longitudinal surface plasmon wavelength (LSPW). The larger Au nanoparticle seeds obtained via longer growth/aging time resulted in Au nanorods with lower aspect ratio and shorter LSPW.
ISSN:1388-0764
1572-896X
DOI:10.1007/s11051-012-1289-3