Surface-enhanced Raman spectroscopy and nanogeometry: The plasmonic origin of SERS

被引:236
作者
Lee, Seung Joon
Guan, Zhiqiang
Xu, Hongxing
Moskovits, Martin [1 ]
机构
[1] Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93106 USA
[2] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
关键词
SILVER ELECTRODE; SCATTERING SERS; MOLECULES; FIELD; NANOPARTICLE; RESONANCES; PYRIDINE; SPECTRA; SPHERES; ARRAYS;
D O I
10.1021/jp077422g
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
Using a series of highly regular nanostructures consisting of periodic Ag nanowires fabricated in porous aluminum oxide, we validate the overwhelmingly plasmonic origin of the most intense SERS signals such as those responsible for single-molecule SERS, demonstrating its sensitive dependence on the system's nanogeometry. By varying the interwire gap distance from 35 to 10 nm, the SERS intensity excited with 785 nm laser light, increased over 200-fold. These observations were shown to agree quantitatively with electromagnetic field calculations carried out using the free space green's tensor method.
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页码:17985 / 17988
页数:4
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