物理化学学报Issue(7)：1201-1207,7.DOI:10.3866/PKU.WHXB201405191
基于自组装纳米金单层膜的全内反射SERS研究
Study of Total Internal Reflection SERS Based on Self-Assembled Gold Nanoparticle Monolayer Film
摘要
Abstract
Two types of Surface Enhanced Raman Scattering (SERS) substrates were prepared by self-assembly of gold nanoparticle (GNP) monolayers film on either bare glass substrates (glass/GNP) or glass substrates with a 30 nm thick gold film (glass/Au/GNP). SERS spectra of dye molecules adsorbed on the two substrates were obtained by total internal reflection (TIR) of an excitation laser beam combined with col ection of the air-side signal. The experimental results demonstrated that the signal enhancement factors of the two SERS substrates greatly depend on the polarization state of the excitation beam. In the case of the glass/GNP substrate, the signal enhancement factor obtained with the s-polarization TIR is two to five times as higher as that observed with the p-polarization TIR, indicating the formation of“hot spots”between adjacent particles in the GNP monolayer. With the glass/Au/GNP substrate, the SERS signal can be excited only by p-polarization TIR at a specific reflection angle, and the air-side SERS signal is almost 30 times that obtained with the glass/GNP substrate. The findings suggest that significant field enhancement is induced by the coupling between propagating surface plasmon resonance (SPR) and the localized SPR within the glass/Au/GNP substrate. Using a linear polarizer, the air-side SERS signal was verified to be non-polarized, containing s and p components of almost equal intensities. Further investigations revealed that the glass/Au/GNP substrate al ows for directional emission of the SERS signal with the p-polarization state.关键词
纳米金单层膜/全内反射/表面增强拉曼散射/偏振状态/背向收集/定向发射Key words
Gold-nanoparticle monolayer film/Total internal reflection/Surface enhanced Raman scattering/Polarization state/Air-side col ection/Directional emission分类
化学化工引用本文复制引用
赵乔,逯丹凤,刘德龙,陈晨,胡德波,祁志美..基于自组装纳米金单层膜的全内反射SERS研究[J].物理化学学报,2014,(7):1201-1207,7.基金项目
The project was supported by the Major National Scientific Instrument and Equipment Development Project of China (2011YQ0301240802), Research Equipment Development Project of Chinese Academy of Sciences (YZ201106), National Natural Science Foundation of China (61377064).国家重大科学仪器设备开发项目(2011YQ0301240802),中国科学院科研装备研制项目(YZ201106)和国家自然科学基金(61377064)资助 （2011YQ0301240802）
