Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Symposium: Bimetallic Nanosystems: Tuning Physical and Chemical Properties I (Invited Speakers: Harald Brune, Michael Hilgendorff, Konstantin Neyman)

O 60.8: Vortrag

Donnerstag, 28. Februar 2008, 12:00–12:15, MA 005

Tuning of the particle plasmon resonance in 2D and 3D polymer nanocomposites with bimetallic alloy particles prepared by vapor phase co-deposition — •Vladimir Zaporojtchenko, Venkata Sai Kiran Chakravadhanula, Haile Takele, Carolin Schulz, Thomas Strunskus, and Franz Faupel — Chair for Multicomponent Materials, Institute for Materials Science, Christian-Albrechts University at Kiel, Kaiserstr. 2, Kiel, Germany, 24143.

2D- and 3D- nanocomposite films consisting of bimetallic Ag-Cu or Ag-Au nanoparticles embedded in a nylon matrix were prepared by co-deposition of the components from three different evaporators in high vacuum. The microstructure of the nanocomposites and of the nanoparticles were investigated by TEM, XPS, XAFS, Electron Loss Spectroscopy and UV-Visible spectroscopy, with a focus on alloy formation, and the changes of the plasmon resonance bands. Shifts of the plasmon resonance of bimetallic alloy nanocomposites in a large spectral range (between 300 and 1000 nm) were observed by varying the ratio of the involved metals at a constant metal filling factor in the composites. The influence of substrate temperature on alloy formation in the core-shell nanoparticles was also studied. Shifting of the particle plasmon resonance either excited by light absorption or low energy electron scattering opens a new possibility to study the alloy formation in bimetallic nanoparticles.