Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 38, Pages 12732-12738Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201301753
Keywords
bimetallic nanorods; core-shell; end facets; gold; seed-mediated growth; silver
Categories
Funding
- Ministry of Education, Singapore [R279-000-391-112]
- MERLION Programme
- National University of Singapore
- French Ministry of Foreign Affairs [R279-000-334-133]
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Au@Ag core-shell nanorods with tunable end facets are obtained by coating Au bipyramids (BPs) with Ag. The resultant nanorods exhibit a pentatwinned crystal structure with tips terminated with either {110} or {111} facets. The control over the end facets is achieved by varying the capping agents and tuning the reduction rate of Ag. Specifically, when Ag is reduced slowly, Au@Ag nanorods with flat {110} end facets are formed with cetyltrimethylammonium bromide (CTAB) as the capping agent. If CTAB is replaced with cetyltrimethylammonium chloride (CTAC), Au@Ag nanorods with tips terminated with {111} facets are obtained. However, at a high Ag reduction rate, dumbbell-shaped Au@Ag nanorods are formed, with either CTAB or CTAC as the capping agent. The morphological evolution of the nanorods in each case is closely followed and a growth mechanism is proposed.
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