Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 38: Magnetic Nanoparticles
MA 38.8: Talk
Thursday, March 19, 2015, 11:30–11:45, H 0110
On the statistical nature of intermetallic nanoparticle assemblies — •Markus Gellesch1, Franziska Hammerath1,2, Silke Hampel1, Sabine Wurmehl1,2, and Bernd Büchner1,2 — 1Institut für Festkörperforschung, IFW Dresden — 2Institut für Festkörperphysik, TU Dresden
It is well known, that the synthesis of nanoparticles usually results in the formation of particles with a certain distribution of geometries (e.g. diameter, shape). Since, especially at the nanoscale, shape and size govern the physical properties including the occurence of magnetic phenomena, one of the challenges in magnetic nanoparticle synthesis is to create monodisperse particle assemblies.
Here, we raise the issue of an additional challenge since we report about distributed chemical compositions in intermetallic nanoparticle assemblies with ternary precursor conditions. Our results were obtained by an extensive TEM-EDX study of a larger number of individual particles. In order to crosscheck and to validate our results obtained with TEM we successfully applied the solid state NMR technique where the local environments of all particles in the sample are observed.
We are confident, that our results guide the way to establish NMR as a powerfull tool to characterize complex multi-element magnetic nanoparticle assemblies.