Surface modification of metal and metal coated nanoparticles to induce clustering

M. H. Gowda; O. J. Glembocki; S. Geng; S. M. Prokes; N. Garces; J. D. Caldwell

doi:10.1117/12.862367

27 August 2010 Surface modification of metal and metal coated nanoparticles to induce clustering

M. H. Gowda, O. J. Glembocki, S. Geng, S. M. Prokes, N. Garces, J. D. Caldwell

Proceedings Volume 7768, Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials II; 77680L (2010) https://doi.org/10.1117/12.862367
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

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.

Citation Download Citation

M. H. Gowda, O. J. Glembocki, S. Geng, S. M. Prokes, N. Garces, and J. D. Caldwell "Surface modification of metal and metal coated nanoparticles to induce clustering", Proc. SPIE 7768, Nanoepitaxy: Homo- and Heterogeneous Synthesis, Characterization, and Device Integration of Nanomaterials II, 77680L (27 August 2010); https://doi.org/10.1117/12.862367

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