Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 60: Nanomaterials - Nanoparticles
MM 60.4: Vortrag
Donnerstag, 14. März 2013, 16:30–16:45, H25
Synthesis and characterization of magnetic core-shell nanoparticles — •Marcel Hennes1, Andriy Lotnyk1, and Stefan G. Mayr1,2,3 — 1Leibniz-Institut für Oberflächenmodifizierung e.V. (IOM), Leipzig, Germany — 2Translationszentrum für Regenerative Medizin (TRM), Universität Leipzig, Germany — 3Fakultät für Physik und Geowissenschaften, Universität Leipzig, Germany
Magnetic nanoparticles with an inert functionalizable shell have received increasing attention during the past years, owing to their application potential e.g. in medicine or catalysis. In the present contribution, we report about our approaches to synthesize tailored magnetic core-shell nanoparticles using plasma assisted inert gas condensation (PA-IGC). Employing Cu/Ni as example of a binary alloy with moderate miscibility gap and different surface energies of the constituents, we first address the potential of synthesizing rotationally symmetric core-shell structures by self-organization using a combined Monte-Carlo / Molecular Dynamics computer simulation approach based on different well-established embedded atom method (EAM) potentials. Our results indicate presence of a Cu segregation layer of about one monolayer thickness, but absence of spherically symmetric core-shell particles. Motivated by these findings, an experimental setup with a post-synthesis coating stage is presented, that is capable of producing fine-tuned core-shell magnetic structures, as verified with aberration corrected high resolution transmission electron microscopy.