用于表面增强拉曼散射的纳米颗粒-镜子夹心衬底

Nanoparticle-mirror sandwich substrates for surface-enhanced Raman scattering.

作者信息

Daniels Jacquitta K, Chumanov George

机构信息

Department of Chemistry, Clemson University, Clemson, South Carolina 29634, USA.

出版信息

J Phys Chem B. 2005 Sep 29;109(38):17936-42. doi: 10.1021/jp053432a.

DOI:10.1021/jp053432a

PMID:16853302

Abstract

Sandwich surface-enhanced Raman scattering (SERS) substrates (3S) utilizing coupling between continuous metal films and plasmonic particles were fabricated using silver mirrors, electrochemically roughened films, and various sizes of silver nanoparticles. The effect of excitation wavelength and nanoparticle size on SERS spectra of poly(vinylpyridine), selected as a model compound, was studied to determine the optimum conditions for the strongest SERS signal. The Raman enhancement resulted from the plasmon coupling of silver nanoparticles to the underlying continuous film as well as the lateral plasmon coupling between the silver nanoparticles. The formation of the charge transfer complex was also observed. The 3S configuration was used to obtain SERS spectra of dipicolinic acid (DPA), a chemical signature for Bacillus anthracis.

摘要

利用连续金属膜与等离子体粒子之间的耦合作用制备了三明治式表面增强拉曼散射（SERS）基底（3S），该基底采用了银镜、电化学粗糙化膜以及各种尺寸的银纳米粒子。以聚（乙烯基吡啶）作为模型化合物，研究了激发波长和纳米粒子尺寸对其SERS光谱的影响，以确定获得最强SERS信号的最佳条件。拉曼增强源于银纳米粒子与下层连续膜的等离子体耦合以及银纳米粒子之间的横向等离子体耦合。还观察到了电荷转移络合物的形成。采用3S构型获得了炭疽芽孢杆菌的化学特征物质吡啶二甲酸（DPA）的SERS光谱。