Gold bowtie nanoantennas for surface-enhanced Raman scattering under controlled electrochemical potential

被引：62

作者：

Jackel, F. ^{[1
]}

Kinkhabwala, A. A. ^{[1
]}

Moerner, W. E. ^{[1
]}

机构：

[1] Stanford Univ, Dept Chem, Stanford, CA 94305 USA

来源：

CHEMICAL PHYSICS LETTERS | 2007年 / 446卷 / 4-6期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/j.cplett.2007.08.074

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：

Single gold bowtie nanoantennas are used for surface-enhanced Raman scattering under controlled electrochemical potential. Raman spectra of para-mercaptoaniline molecules chernisorbed to newly-prepared bowties at low laser power show only stable a(1) or a(2) symmetric modes. Surprisingly, electrochemical cycling induces a reproducible switching-on of b(2) symmetric modes. The changes are related to electrochemically-induced surface roughening which alters the relative orientation between adsorbate and local electromagnetic fields. Finite-difference time-domain calculations along with symmetry-based arguments allow determination of the initial orientation of the adsorbed molecules. Our findings underscore the necessity of well-characterized substrates for a meaningful analysis of surface-enhanced Raman spectra. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：339 / 343

页数：5