Growth of Au@Ag Core-Shell Pentatwinned Nanorods: Tuning the End Facets

被引：25

作者：

Zhang, Weiqing ^{[1
]}

Goh, Hao Ying Johnny ^{[1
]}

Firdoz, Shaik ^{[1
]}

Lu, Xianmao ^{[1
]}

机构：

[1] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 117576, Singapore

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2013年 / 19卷 / 38期

关键词：

bimetallic nanorods; core-shell; end facets; gold; seed-mediated growth; silver; SEED-MEDIATED GROWTH; GOLD NANORODS; SILVER NANOWIRES; OPTICAL-PROPERTIES; NANOCRYSTALS; MECHANISM; NANOPARTICLES; BIPYRAMIDS; MORPHOLOGY; NANOSTRUCTURES;

D O I：

10.1002/chem.201301753

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：12732 / 12738

页数：7

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