Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 54: Nanostructured Materials V

MM 54.5: Vortrag

Donnerstag, 25. März 2010, 16:15–16:30, H16

Synthesis and mechanical properties of iron-filled carbon nanotubes — •Uhland Weißker, Markus Löffler, Franziska Wolny, Thomas Mühl, Albrecht Leonhardt, and Bernd Büchner — Leibniz-Institut für Festkörper- und Werkstoffforschung, IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Deutschland

Iron-filled carbon nanotubes (CNTs) are a promising material for magnetic applications. In addition to their interesting magnetic properties their mechanical properties are also very important for applications as probes for magnetic force microscopy (MFM) or actuators.

The mechanical properties of iron-filled multi-walled carbon nanotubes were investigated by static and dynamic bending methods.

It was found that a modified Euler-Bernoulli beam model, accounting for the mounting of the CNT on a substrate and characteristic structural defects, can be used to evaluate and explain the experimental data in order to obtain the mechanical properties. Dominating defects influence the mechanical behavior which is expressed by an eigen mode frequency ratio that differs from that of an ideal beam. Furthermore, the shape of the envelope of the resonant vibration state is evaluated.

It is also shown that the resonance frequency of the CNTs can be tailored by etching the CNTs in a water vapor environment inside a scanning electron microscope (SEM). The mechanical properties of iron-filled CNTs are comparable to that of unfilled multi-walled CNTs, thus they are promising material for MFM probes.