Growth of gold bipyramids with improved yield and their curvature-directed oxidation

被引:213
作者
Kou, Xiaoshan [1 ]
Ni, Weihai [1 ]
Tsung, Chia-Kuang [2 ]
Chan, Kong [1 ]
Lin, Hai-Qing [1 ]
Stucky, Galen D. [2 ]
Wang, Jianfang [1 ]
机构
[1] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
[2] Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA
关键词
bipyramids; gold; oxidation; surface plasmon resonance; surfactants;
D O I
10.1002/smll.200700379
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The surface-plasmon properties of Au bipyramids are investigated using the finite-difference time-domain method. It is found that both the extinction cross sections and local electric-field enhancements of Au bipyramids are larger than those of Au nanorods that have longitudinal surface plasmon (LSP) wavelengths close to those of Au bipyramids. Following this result the growth of Au bipyramids using cationic surfactants of variously sized headgroups as stabilizing agents is carried out. It is found that the growth using cetyltributylammonium bromide (CTBAB) produces Au bipyramids with tunable LSP wavelengths in high yields. The oxidation behaviour of Au bipyramids using hydrogen peroxide as the oxidizing agent is fully explored and the oxidation is found to occur preferentially at highly curved surface sites. It is further demonstrated that the oxidation rate can be controlled by varying the amounts of hydrogen peroxide and hydrochloric acid. This oxidation approach can be used in conjunction with the seed-mediated growth in CTBAB solutions to produce Au bipyramids, the LSP wavelengths of which are finely tunable from 650 to 1300 nm.
引用
收藏
页码:2103 / 2113
页数:11
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