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Crystal Overgrowth on Gold Nanorods: Tuning the Shape, Facet, Aspect Ratio, and Composition of the Nanorods
Author(s) -
Song Jae Hee,
Kim Franklin,
Kim Daniel,
Yang Peidong
Publication year - 2005
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200400805
Subject(s) - nanorod , materials science , facet (psychology) , bimetallic strip , crystal (programming language) , chemical engineering , ascorbic acid , nanotechnology , raman spectroscopy , metal , chemistry , optics , metallurgy , psychology , social psychology , physics , food science , engineering , personality , computer science , big five personality traits , programming language
Electrochemically prepared Au nanorods were used as seeds for the overgrowth of thin shells of gold, silver, and palladium by using a mild reducing agent, ascorbic acid, in the presence of surfactants at ambient condition. The unique crystal facets of the starting nanorods results in anisotropic crystal overgrowth. The overgrowth rates along different crystallographical directions can be further regulated by adding foreign ions or by using different metal reduction methods. This overgrowth study provides insights on how different metal ions could be reduced preferentially on different Au nanorod surfaces, so that the composition, aspect ratio, shape, and facet of the resulting nanostructures can be rationally tuned. These surfactant‐stabilized bimetallic Au core M shell (M=Au, Ag, Pd) nanorod colloids might serve as better substrates in surface‐enhanced Raman spectroscopy as well as exhibiting enhanced catalytic properties.