Dresden 2006 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 24: Poster presentation

DS 24.20: Poster

Dienstag, 28. März 2006, 15:00–17:30, P2

Tuning the surface plasmon resonance in polymer-bimetallic (Au-Ag) nanocomposites — •Venkata Sai Kiran Chakravadhanula, Haile Takele, Henry Greve, Mady Elbahri, Vladimir Zaporojtchenko, and Franz Faupel — Chair for Multicomponent Materials, Technical Faculty of the CAU Kiel, Kaiserstr. 2, 24143 Kiel, Germany.

Nanocomposite thin films with noble metal nanoparticles embedded in or on top of a dielectric material show attractive optical properties at the surface plasmon resonance (SPR) wavelength due to dielectric and quantum confinement effects. Their optical response at SPR can be used in various applications like Raman Spectroscopy, surface enhanced fluorescence, color filters, sensors and optical switching devices. In this work, we applied a vapor phase tandem deposition method to generate polymer-metal nanocomposites. We observed core-shell type structures after tandem deposition of Au and Ag on polystyrene. Thermal annealing of these led to SPR shift due to alloy formation. We also produced sandwich structures consisting of nanoclusters of different metals separated by a thin polymer barrier. By tailoring parameters like metallic concentration and by sandwiching the Au/Ag particles between polymer with different thickness, the multiple plasmon resonances can be tuned over a wide visible wavelength range.