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Proceedings Paper

Surface modification of metal and metal coated nanoparticles to induce clustering
Author(s): M. H. Gowda; O. J. Glembocki; S. Geng; S. M. Prokes; N. Garces; J. D. Caldwell
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Paper Abstract

Surface enhanced Raman scattering (SERS) is a powerful technique for the detection of submonolayer coverage of gold or silver surfaces. The magnitude of the effect and the spectral wavelength of the peak depend on the metal nanoparticles used and its geometry. In this paper we show that the use of chemicals that bind to gold or silver can lead to the clustering of nanoparticles. We used well defined Au nanoparticles in our experiments and add cysteamine to solutions containing the nanoparticles. The plasmonic response of the nanoparticles is measured by transmission Surface Plasmon Resonance (SPR) spectroscopy. We observed significant changes to the SPR spectra that are characteristics of close coupled nanoparticles. The time evolution of these changes indicates the formation of gold nanoparticles clusters. The SERS response of these clustered nanoparticles is observed to red shift from the designed peak wavelength in the green to the red. In addition, the placement of these clusters on dielectric surfaces shifts the SPR even more into the red. The experimental results are supported by calculations of the electromagnetic fields using finite difference methods.

Paper Details

Date Published: 27 August 2010
PDF: 7 pages
Proc. SPIE 7768, Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials II, 77680L (27 August 2010); doi: 10.1117/12.862367
Show Author Affiliations
M. H. Gowda, Naval Research Lab. (United States)
O. J. Glembocki, Naval Research Lab. (United States)
S. Geng, Univ. of Maryland, College Park (United States)
S. M. Prokes, Naval Research Lab. (United States)
N. Garces, Naval Research Lab. (United States)
J. D. Caldwell, Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 7768:
Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials II
M. Saif Islam; Nobuhiko P. Kobayashi; A. Alec Talin, Editor(s)

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