Wavelength Dependence of Raman Enhancement from Gold Nanorod Arrays: Quantitative Experiment and Modeling of a Hot Spot Dominated System

被引：80

作者：

Doherty, Matthew D. ^{[1
]}

Murphy, Antony ^{[1
]}

McPhillips, John ^{[1
]}

Pollard, Robert J. ^{[1
]}

Dawson, Paul ^{[1
]}

机构：

[1] Queens Univ Belfast, Sch Maths & Phys, Ctr Nanostructured Media, Belfast BT7 1NN, Antrim, North Ireland

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 47期

基金：

英国工程与自然科学研究理事会;

关键词：

RHODAMINE; 6G; SCATTERING; NANOSTRUCTURES; NANOPARTICLES; SPECTROSCOPY; FABRICATION; MOLECULES;

D O I：

10.1021/jp107063x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Surface-enhanced Raman scattering (SERS) spectra from molecules adsorbed on the surface of vertically aligned gold nanorod arrays exhibit a variation in enhancement factor (EF) as a function of excitation wavelength that displays little correlation with the elastic optical properties of the surface. The key to understanding this lack of correlation and to obtaining agreement between experimental and calculated EF spectra lies with consideration of randomly distributed, sub-10 nm gaps between nanorods forming the substrate. Intense fields in these enhancement "hot spots" make a dominant contribution to the Raman scattering and have a very different spectral profile to that of the elastic optical response. Detailed modeling of the electric field enhancement at both excitation and scattering wavelengths was used to quantitatively predict both the spectral profile and the magnitude of the observed EF.

引用

页码：19913 / 19919

页数：7

共 29 条

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