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MM: Fachverband Metall- und Materialphysik
MM 55: Nanomaterials III - Electronic, magnetic and optical properties
MM 55.3: Talk
Thursday, April 3, 2014, 12:30–12:45, IFW B
Plasma assisted gas phase synthesis and high resolution characterization of bimetallic magnetic core-shell nanoparticles — •Marcel Hennes1, Andriy Lotnyk1, and Stefan G. Mayr1,2,3 — 1Leibniz-Institut für Oberflächenmodifizierung, Leipzig, Germany — 2Translationszentrum für Regenerative Medizin, Leipzig, Germany — 3Fakultät für Physik und Geowissenschaften, Universität Leipzig, Germany
Magnetic nanoparticles (MNPs) can be employed as powerful nanotools in many areas of biology, biophysics and medicine. Therefore, fine tuning of their physical properties is highly desired and can be achieved by controlling their size or shape or by using combinations of materials at the nanoscale. With this background, a setup for synthesis of heterostructured magnetic core-shell nanoparticles (CS-MNPs) relying on optionally pulsed DC plasma assisted inert gas condensation (PA-IGC) has been developed. We demonstrate synthesis of elemental nickel nanoparticles with highly tunable sizes and shapes as well as Ni@Cu CS-MNPs. The particles are characterized with respect to their structural and magnetic properties using AFM, MFM, SEM, HRTEM and EDX measurements. An analytical model is used to describe Cu shell atom deposition on top of Ni-particles in the gas phase. Its predictive power and possible implications for heterostructured NP growth are discussed.