Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Nano-optics of metallic and semiconducting nanostructures (experiments II)
O 54.3: Vortrag
Donnerstag, 26. März 2009, 15:30–15:45, SCH A216
Bimetallic core-shell nanoparticles: In-situ controlled manipulation of plasmonic properties and material composition — •Thomas Härtling1, Nadja C. Bigall2, Alexander Eychmüller2, and Lukas M. Eng1 — 1Institut für Angewandte Photophysik, TU Dresden, 01062 Dresden — 2Physikalische Chemie und Elektrochemie, TU Dresden, 01062 Dresden, Germany
Due to their distinct physical and chemical properties, metal nanoparticles are crucial components of various nanotechnological applications. For most of them, the particle material composition is a key parameter defining the optical, magnetic, and catalytic particle properties. Here we report on the in-situ controlled manipulation of this material composition atr the surface of single bimetallic core-shell nanoparticles by optically induced metal deposition. Two strategies are followed to illustrate the capabilities of this photochemical approach. On the one hand, single core particles without a localized surface plasmon (LSP) resonance in the VIS are decorated with a plasmonically active shell, which renders the particles visible in the optical microscope. Vice versa, the light scattered from a LSP resonant particle is used to monitor the photochemical deposition of a nonresonant metal shell. These two approaches are demonstrated by the fabrication of Au@Pt and Cu@Au particles, respectively, leading to different, in-situ controlled optical and chemical particle properties. The presented method is applicable to an extremely wide range of material combinations and thus paves the way for the optically in-situ controlled fabrication and manipulation of multi-composite nanostructures.