Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 36: Magnetic Heusler Compounds II

MA 36.9: Vortrag

Donnerstag, 29. März 2012, 12:15–12:30, H 1012

Carbon nanotubes filled with Heusler compounds — •Markus Gellesch, Silke Hampel, Diana Haase, Christian G.F. Blum, Elok Fidiani, Michael Schulze, Christine Täschner, Albrecht Leonhardt, Sabine Wurmehl, and Bernd Büchner — Leibniz Institut für Festkörper- und Werkstoffforschung Dresden

Filling carbon nanotubes with metal compounds is a challenge and limited to few materials so far, despite the prospect of application in e.g. storage technologies or the medical field. Here we present a versatile wet chemical approach that can be used to fill various intermetallic compounds into the inner cavity of multiwalled carbon nanotubes. With this method we synthesize successfully Heusler compounds inside carbon nanotubes. Filled carbon nanotubes are characterized by electron microscopy and x-ray probes as well as by temperature dependent magnetometry. We observe that fillings occur in form of nanoparticles with diameters in the range of 30-60nm. The particles are ferromagnetic and show a saturation magnetic moment comparable to the bulk saturation moment. However, coercive fields are strongly enhanced. We further report that oxidation is suppressed in intermetallic particles in contact with carbon nanotubes. The results of our work may guide the way to the synthesis of numerous other intermetallic systems as nanoparticles.