Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 55: Poster Session III - MA 141/144 (Methods: Atomic and Electronic Structure; Particles and Clusters; Heterogeneous Catalysis; Semiconductor Substrates: Epitaxy and Growth+Adsorption+Clean Surfaces+Solid-Liquid Interfaces; Oxides and Insulators: Solid-Liquid Interfaces+Epitaxy and Growth; Phase Transitions; Metal Substrates: Adsorption of Inorganic Molecules+Epitaxy and Growth; Surface Chemical Reactions; Bimetallic Nanosystems: Tuning Physical and Chemical Properties; Oxides and insulators: Adsorption; Organic, polymeric, biomolecular films; etc.)
O 55.14: Poster
Mittwoch, 27. Februar 2008, 18:30–19:30, Poster F
Swift Heavy Ion (SHI) modification of Ag/Au-TiO2 nanocomposite thin films prepared by co-sputtering. — Venkata Sai Kiran Chakravadhanula1, Venkata Girish Kotnur1, Amit Kulkarni1, Yogendra Kumar Mishra2, Devesh Kumar Avasthi2, Dietmar Fink3, Thomas Strunskus1, •Vladimir Zaporojtchenko1, and Franz Faupel1 — 1Chair for Multicomponent Materials, Institute for Materials Science, Christian-Albrechts University at Kiel, Kaiserstr. 2, Kiel, Germany, 24143. — 2Inter University Accelerator Centre, New Delhi, India, 110067. — 3Hahn Meitner Institut, Glienicker Str. 100, Berlin, Germany, 14109.
Ag-TiO2 and Au-TiO2 nanocomposites with different volume fractions of metal nanoparticles were prepared by co-sputtering. The morphology of these nanocomposites was investigated by transmission electron microscopy (TEM). Metal volume fractions were determined by SEM-EDX. Optical characterization of these nanocomposites was carried out using UV/Vis/NIR spectroscopy. The nanocomposites were then irradiated by Swift Heavy Ions (SHI) with 100 MeV (Ag8+ ions) at different fluences ranging from 1 X 1012 to 1 X 1013 ions/cm2. The extinction spectra of the pristine samples show plasmon resonances at wavelengths which depend on the volume fraction of metal, particle size and morphology of the composites. The influence of the SHI fluences, on the microstructure and the extinction spectra were observed. The changes in the properties of these nanocomposites are discussed in terms of ion-material interactions.