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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 | Citation: | 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 |
Appears in Collections: | Staff Publications |
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