Surface enhanced Raman scattering in the near infrared using metal nanoshell substrates

被引:359
作者
Oldenburg, SJ
Westcott, SL
Averitt, RD
Halas, NJ
机构
[1] Rice Univ, Ctr Nanoscale & Technol, Dept Elect & Comp Engn, Houston, TX 77005 USA
[2] Rice Univ, Rice Quantum Inst, Houston, TX 77005 USA
关键词
D O I
10.1063/1.479235
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
A metal nanoshell is a composite nanoparticle consisting of a dielectric core coated by a thin metal shell; its peak plasmon resonance wavelength is determined by the ratio of the core diameter to the shell thickness. When p-mercaptoaniline (p-MA) is in solution with gold nanoshells that have their plasmon resonance near a 1.06 mu m excitation source, significant surface enhanced Raman scattering (SERS) is observed. The strongest Raman enhancements are obtained when enough gold is deposited on the silica cores to form a nearly complete metal shell. Correlations between transmission electron microscopy (TEM)-defined structure, ultraviolet (UV)-visible spectra, SERS signal strength, and electromagnetic theory show that the SERS signal is due to both the local enhancement of the dielectric field via the plasmon resonance of the nanostructure and to the localized regions of high field intensity provided by the nearly completed gold shell. Comparison with SERS enhancements on completed nanoshell structures indicates the relative contribution of these two effects. (C) 1999 American Institute of Physics. [S0021-9606(99)70733-6].
引用
收藏
页码:4729 / 4735
页数:7
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