Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.44: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Carbon Nanotubes filled with Nanoparticles from the System Ni-Mn-Ga — •Marcel Haft, Silke Hampel, Markus Gellesch, Sabine Wurmehl, Lars Giebeler, Maria Dimitrakopolou, and Bernd Buechner — Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, D-01171

Properties of nanoscale materials can completely change when scaling a bulk-material down to its smallest size. However, especially at nanoscale dimensions oxidation is a fundamental challenge in intermetallic materials, which has so far obstructed the investigation of attractive intermetallic materials at the nanoscale. In this work, we propose a novel approach for the synthesis of intermetallic (magnetic) nanoparticles which is based on the encapsulation of materials inside carbon nanotubes. Hereby carbon nanotubes function as a template for the formation of nanoparticles and nanowires with well-defined sizes and provide protective carbon shells which hinder oxidation of the nanoparticles. We present several wet chemical filling methods, both from solution and from melt of metal nitrates and halides. The samples were well characterized by means of electron microscopy (SEM, TEM), x-ray probes and temperature dependent magnetometry. We observe, that the metallic nanoparticles inside carbon nanotubes exhibit enhanced magnetic performance (increased coercitivity) compared to bulk material. So far Nickel, Manganese and Gallium were filled separately into carbon nanotubes as model compounds. In future we will fill nanoparticles of the respective binary compounds and eventually also the ternary Heusler compound Ni2MnGa into carbon nanotubes.