Designing plasmonic structures: bi-metalic core-shell nanoparticles

Andrea Steinbrück; Andrea Csáki; Grit Festag; Wolfgang Fritzsche

doi:10.1117/12.662778

20 April 2006 Designing plasmonic structures: bi-metalic core-shell nanoparticles

Andrea Steinbrück, Andrea Csáki, Grit Festag, Wolfgang Fritzsche

Proceedings Volume 6195, Nanophotonics; 619513 (2006) https://doi.org/10.1117/12.662778
Event: SPIE Photonics Europe, 2006, Strasbourg, France

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.

Citation Download Citation

Andrea Steinbrück, Andrea Csáki, Grit Festag, and Wolfgang Fritzsche "Designing plasmonic structures: bi-metalic core-shell nanoparticles", Proc. SPIE 6195, Nanophotonics, 619513 (20 April 2006); https://doi.org/10.1117/12.662778

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