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

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.

Keywords: gold nanorods surface plasmon resonance self assemble surface enhanced Raman scattering

Received: 01 March 2011
Revised: 13 April 2011
Accepted manuscript online:

PACS:	61.46.Km	(Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires))
	74.25.nd	(Raman and optical spectroscopy)
	78.67.Qa	(Nanorods)
	87.64.kp	(Raman)

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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 2011 Chin. Phys. B 20 076103

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

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