Please use this identifier to cite or link to this item: https://doi.org/10.1002/chem.201301753
Title: Growth of Au@Ag core-shell pentatwinned nanorods: Tuning the end facets
Authors: Zhang, W.
Goh, H.Y.J.
Firdoz, S.
Lu, X. 
Keywords: bimetallic nanorods
core-shell
end facets
gold
seed-mediated growth
silver
Issue Date: 16-Sep-2013
Source: Zhang, W., Goh, H.Y.J., Firdoz, S., Lu, X. (2013-09-16). Growth of Au@Ag core-shell pentatwinned nanorods: Tuning the end facets. Chemistry - A European Journal 19 (38) : 12732-12738. ScholarBank@NUS Repository. https://doi.org/10.1002/chem.201301753
Abstract: 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. In tip-top shape: 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} end facets. Control over the end facets is achieved by varying the capping agents and tuning the reduction rate of Ag (see figure). Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Source Title: Chemistry - A European Journal
URI: http://scholarbank.nus.edu.sg/handle/10635/64001
ISSN: 09476539
DOI: 10.1002/chem.201301753
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