Berlin 2008 – wissenschaftliches Programm

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BP: Fachverband Biologische Physik

BP 26: Posters II

BP 26.21: Poster

Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A

Magnetic Properties of Iron Nanowires Encapsulated in Carbon Nanotubes — •K. Lipert¹, M. Lutz¹, T. Mühl¹, K. Krämer², A. Taylor², R. Klingeler¹, and B. Büchner¹ — ¹Leibniz-Institut für Festkörper- und Werkstoffforschung, PF 270116, D-01171 Dresden, Germany — ²Universitätsklinikum der Technischen Universität Dresden, Fetscherstraße 74, D-01307 Dresden, Germany

Introducing nanomagnets into carbon shells provides a promising route to synthesize novel magnetic nanoparticles with well defined geometrical dimensions. Carbon shells provide wear resistance and oxidation protection, can stabilize novel magnetic molecules and enhance possibilities for exohedral functionalisation. Here, we report on a systematic approach to study magnetic nanoparticles encapsulated in carbon nanotubes and nanospheres which are exploited for an application in biomedicine, i.e. as contrast agents or for hyperthermia cancer treatment. We present thorough magnetic and structural studies on ensembles and on individual particles. The ensemble studies are done both inside and outside biological systems. XRD patterns and TEM pictures are shown along with hysteresis loops measured at carbon nanotubes inside cancer cells as well as grown on silicon oxide substrates. Magnetic studies of individual Fe filled CNTs performed by means of the MFM technique and the micro hall magnetometry setup based on a GaAs nanoscaled Hall-cross are presented which provide an insight into the magnetisation reversal.