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

doi:10.1088/1674-1056/20/7/076103

中国物理B ›› 2011, Vol. 20 ›› Issue (7): 76103-076103.doi: 10.1088/1674-1056/20/7/076103

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

时雪钊¹, 王春明¹, 申承民², 王登科², 李晨², 田园², 徐桎川², 高鸿钧²

(1)College of Chemistry and Engineering, Lanzhou University, Lanzhou 730000, China; (2)Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2011-03-01 修回日期:2011-04-13 出版日期:2011-07-15 发布日期:2011-07-15

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

Shi Xue-Zhao(时雪钊)^a)b), Shen Cheng-Min(申承民)^b), Wang Deng-Ke(王登科)^b)c), Li Chen(李晨)^b), Tian Yuan(田园)^b), Xu Zhi-Chuan(徐桎川)^b), Wang Chun-Ming(王春明)^a)†, and Gao Hong-Jun(高鸿钧)^b)‡

^a College of Chemistry and Engineering, Lanzhou University, Lanzhou 730000, China; ^b Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; ^b School of Physical Science and Technology, Yunnan University, Kunming 650091, China

Received:2011-03-01 Revised:2011-04-13 Online:2011-07-15 Published:2011-07-15

摘要/Abstract

摘要： 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 6G) 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.

关键词: gold nanorods, surface plasmon resonance, self assemble, surface enhanced Raman scattering

Abstract: 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 6G) 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.

Key words: gold nanorods, surface plasmon resonance, self assemble, surface enhanced Raman scattering

中图分类号: (Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires))

61.46.Km

74.25.nd (Raman and optical spectroscopy) 78.67.Qa (Nanorods) 87.64.kp (Raman)

时雪钊, 申承民, 王登科, 李晨, 田园, 徐桎川, 王春明, 高鸿钧. Surface-enhanced Raman scattering properties of highly ordered self-assemblies of gold nanorods with different aspect ratios[J]. 中国物理B, 2011, 20(7): 76103-076103.

Shi Xue-Zhao(时雪钊), Shen Cheng-Min(申承民), Wang Deng-Ke(王登科), Li Chen(李晨), Tian Yuan(田园), Xu Zhi-Chuan(徐桎川), Wang Chun-Ming(王春明), and Gao Hong-Jun(高鸿钧). Surface-enhanced Raman scattering properties of highly ordered self-assemblies of gold nanorods with different aspect ratios[J]. Chin. Phys. B, 2011, 20(7): 76103-076103.

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

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

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