Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 54: Nanostructured Materials V
MM 54.3: Vortrag
Donnerstag, 25. März 2010, 15:45–16:00, H16
Direct imaging and analysis of the internal interfaces between carbon nanotubes and their catalyst particles — •Darius Pohl1, Franziska Schäffel1, Christine Täschner2, Mark Hermann Rümmeli2, Christian Kisielowski3, Ludwig Schultz1, and Bernd Rellinghaus1 — 1IFW Dresden, IMW, Dresden, D-01171, Germany — 2IFW Dresden, IFF, Dresden, D-01171, Germany — 3NCEM, LBNL, Berkeley, CA 94720, USA
The functionalization of the ends of the CNT has become an important research field due to the potential to hereby modify their physical properties. Functionalized CNT can thus be used to build up new micro-scaled structures with high performance. Owing to its large magneto-crystalline anisotropy energy, L10 ordered FePt is among the most intensively discussed materials when it comes to pushing the superparamagnetic limit towards minimum particle sizes. As a consequence, this material is of particular interest for the realisation of a hard-magnetic termination of the CNT. CNTs as obtained grown via PE-CVD from Fe-Pt multi-layer thin films are characterized by means of aberration-corrected HRTEM. In order to gain a deeper insight into the growth mechanism structural investigations are focused on the atomically resolved characterisation of the FePt-CNT interface. First results on the atomic structure of this metal-carbon interface will be presented. Near-interface lattice expansion is observed which is attributed to Pt segregation towards the surface of the catalyst particle. The results of the structural characterization will be compared with the thermodynamically favoured nucleation sites of the graphitic layers.