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Proceedings Paper

Designing plasmonic structures: bi-metalic core-shell nanoparticles
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Paper Abstract

Chemical approaches allow for the synthesis of highly defined metal hetero-nanostructures, such as core-shell nanospheres. Because the material of metal nanoparticles determines the plasmon resonance-induced absorption band, the control of particle composition results in control of the position of the absorption band. Metal deposition on gold or silver nanoparticles yielded core-shell particles with modified optical properties. Besides the optical characterization, the utilization of AFM and TEM yielded important information about the morphology of the nanoparticle complexes. UV-vis spectroscopy on solution-grown and surface-grown particles was conducted as ensemble measurements in solution. Increasing layers of a second metal lead to a shift in the absorption band, and a shell diameter comparable to the original particle diameter leads to a predominant influence of the shell material. The extent of shell growth could be controlled by reaction time or the concentration of either the metal salt or the reducing agent.

Paper Details

Date Published: 20 April 2006
PDF: 6 pages
Proc. SPIE 6195, Nanophotonics, 619513 (20 April 2006); doi: 10.1117/12.662778
Show Author Affiliations
Andrea Steinbrück, Institute for Physical High Technology (Germany)
Andrea Csáki, Institute for Physical High Technology (Germany)
Grit Festag, Institute for Physical High Technology (Germany)
Wolfgang Fritzsche, Institute for Physical High Technology (Germany)

Published in SPIE Proceedings Vol. 6195:
David L. Andrews; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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