Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 12: Postersitzung I

MM 12.43: Poster

Montag, 14. März 2011, 17:30–19:00, P5

Interface studies on carbon nanotubes grown from Fe₂₀Ni₈₀ catalysts particles — •Anja Kießling, Darius Pohl, Christine Täschner, Mark Herrmann Rümmeli, Ludwig Schultz, and Bernd Rellinghaus — IFW Dresden, D-01069 Dresden, Germany.

Hard-magnetically terminated carbon nanotubes (CNT) are of particular interest for applications in the field of nanotechnology. Recent results obtained on CNT which are grown from and terminated with FePt nanoparticles [1] imply that there is (i) an enrichment of Pt at the particle surface and (ii) an energetically favored facet from which the carbon is released in order to grow the CNT.

In order to further improve the understanding of the physical principles that govern the catalytic growth of the nanotubes, CNT were grown via plasma-enhanced chemical vapor deposition from Ni-rich Fe₂₀Ni₈₀ catalyst particles. Likewise prepared CNT are characterized by means of aberration-corrected high resolution transmission electron microscopy (HRTEM). Particular attention is paid to the question as to whether or not there is an indication for a segregation of one of the alloy constituents to the particle surface, as was previously observed in free FeNi particles of close to equi-atomic composition [2]. It is investigated, if there is a preference for the type of facet from which the CNT grow. For the case of CNT growth from Ni particles, MEAM studies indicate that the (111) facet is energetically favored here [3].

[1] F. Schäffel et al., Appl. Phys. Lett. 94 (2009) 193107/1-3. [2] B. Bieniek et al., J. Nanoparticle Res. (submitted). [3] W. Xiao et al., Surf. Sci. 603 (2009) 1985-1998.