Surface-enhanced Raman scattering properties of highly ordered self-assemblies of gold nanorods with different aspect ratios

Gold nanorods with aspect ratios of from 1 （particles） to 31.6 were synthesized by the seed-mediated method and packed in a highly ordered structure on a large scale on silicon substrates through capillary force induced self-assembly behaviour during solvent evaporation. The gold nanorod surface exh...

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Published inChinese physics B Vol. 20; no. 7; pp. 312 - 318
Main Author 时雪钊 申承民 王登科 李晨 田园 徐桎川 王春明 高鸿钧
Format Journal Article
LanguageEnglish
Published 01.07.2011
Subjects
Aspect ratio
Coupling (molecular)
Electromagnetic fields
Gold
Nanorods
Raman scattering
Rhodamine 6G
Self assembly
宽高比
拉曼散射光谱
散射特性
有序
纳米棒
自组装行为
表面增强
金
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Summary:Gold nanorods with aspect ratios of from 1 （particles） to 31.6 were synthesized by the seed-mediated method and packed in a highly ordered structure on a large scale on silicon substrates through capillary force induced self-assembly behaviour during solvent evaporation. The gold nanorod surface exhibits a strong enhancing effect on Raman scattering spectroscopy. The enhancement of Raman scattering for two model molecules （2-naphthalenethiol and rhodamine 6C） is about 5-6 orders of magnitude. By changing the aspect ratio of the Au nanorods, we found that the enhancement factors decreased with the increase of aspect ratios. The observed Raman scattering enhancement is strong and should be ascribed to the surface plasmon coupling between closely packed nanorods, which may result in huge local electromagnetic field enhancements in those confined junctions.
Bibliography:Gold nanorods with aspect ratios of from 1 （particles） to 31.6 were synthesized by the seed-mediated method and packed in a highly ordered structure on a large scale on silicon substrates through capillary force induced self-assembly behaviour during solvent evaporation. The gold nanorod surface exhibits a strong enhancing effect on Raman scattering spectroscopy. The enhancement of Raman scattering for two model molecules （2-naphthalenethiol and rhodamine 6C） is about 5-6 orders of magnitude. By changing the aspect ratio of the Au nanorods, we found that the enhancement factors decreased with the increase of aspect ratios. The observed Raman scattering enhancement is strong and should be ascribed to the surface plasmon coupling between closely packed nanorods, which may result in huge local electromagnetic field enhancements in those confined junctions.
11-5639/O4
gold nanorods, surface plasmon resonance, self assemble, surface enhanced Raman scattering
Shi Xue-Zhao, Shen Cheng-Min, Wang Deng-Ke Li Chen, Tian Yuan, Xu Zhi-Chuan, Wang Chun-Ming, Gao Hong-Jun a） College of Chemistry and Engineering, Lanzhou University, Lanzhou 730000, China b） Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China C） School of Physical Science and Technology, Yunnan University, Kunming 650091, China
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ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/7/076103