Surface enhanced infrared absorption (SEIRA) spectroscopy on nanoshell aggregate substrates

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作   者：

Kundu J;  Le F;  Nordlander P;  Halas NJ; 

作者机构：

TX 77005 USA;  Dept Chem;  Dept Phys & Astron;  Lab Nanophoton;  Houston;  Rice Univ;  Dept Elect & Comp Engn; 

关键词：

NANOPARTICLES;  TRANSMISSION;  ISLAND FILMS;  RAMAN-SPECTROSCOPY;  SPECTRA;  RESONANCES;  SCATTERING;  MONOLAYERS;  ARRAYS;  MOLECULES; 

期刊名称：

Chemical Physics Letters

i s s n：

0009-2614

年卷期：

2008 年 452 卷 1-3 期

页   码：

115-119

页   码：

摘   要：

Aggregates of An nanoshells on silicon substrates with plasmon resonances tuned to the infrared region of the spectrum provide a remarkably high-quality substrate for surface enhanced infrared absorption (SEIRA) spectroscopy. SEIRA spectra spanning the chemical fingerprint region of 700-3300 cm(-1) with strong enhancement across this entire spectral range are obtained. SEIRA enhancement factors obtained for para-mercaptoaniline on these substrates are evaluated to be in the 104 range, based on a statistical evaluation of aggregate geometries combined with finite difference time domain modeling of the infrared 'hot spots' characteristic of the constituent structures. (c) 2007 Elsevier B.V. All rights reserved.