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

作　　者：时雪钊 申承民 王登科 李晨 田园 徐桎川 王春明 高鸿钧 

机构地区：[1]College of Chemistry and Engineering,Lanzhou University [2]Institute of Physics,Chinese Academy of Sciences [3]School of Physical Science and Technology,Yunnan University

出　　处：《Chinese Physics B》2011年第7期312-318,共7页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (Grant No.50872147);the National High Technology Research and Development Program of China (Grant No.2007AA03Z305);the Special Doctoral Foundation of the Ministry of Education of China (Grant No.20775030)

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 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.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.

关 键 词：gold nanorods surface plasmon resonance self assemble surface enhanced Raman scattering 

分 类 号：O488[理学—固体物理]