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MM: Fachverband Metall- und Materialphysik

MM 46: Nanostructured Materials III

MM 46.2: Vortrag

Donnerstag, 25. März 2010, 10:30–10:45, H16

Structure, morphology and ageing of dumbbell Ag-Fe nanoparticles — •Anna Elsukova, Zi-An Li, Mehmet Acet, Marina Spasova, and Michael Farle — Fakultät für Physik and CENIDE, Universität Duisburg-Essen, 47048, Duisburg, Germany

Dumbbell-shaped nanocomposites are attracting much attention recently. Multifunctional properties of such systems offer possibilities for various diagnostic and therapeutic applications in biomedicine. [1] We have prepared dumbbell Ag-Fe nanoparticles by magnetron sputtering with subsequent in-flight annealing [2]. As-prepared particles have been aged in ambient atmosphere for 5 months. Structural properties and chemical composition of as-prepared and aged particles were examined by means of analytical electron microscopy including high-resolution imaging, energy dispersive x-ray spectroscopy (EDX) and electron energy-loss spectroscopy (EELS). As-prepared nanocomposites consist of a faceted 4-nm Ag *hat* sitting on a 10-nm Fe@gamma-Fe2O3 particle of more spherical shape. Ageing leads to the changes in the particles crystallinity and morphology. The aged nanocomposite consists of a silver spherical particle that may be attached to a hollow iron oxide sphere containing one or several silver clusters inside. Supported by DFG, SFB445. [1] Chenjie Xu et al., Angew Int Ed Engl. 2008 47(1) 173-176 [2] S. Stappert et al., J. of Cryst. Growth, 252 (2003), 440