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


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