Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Poster 1

HL 9.7: Poster

Montag, 23. März 2009, 14:30–17:00, P2

CVD Growth of Carbon Nanotubes Using Molecular Nanoclusters as Catalyst — •Karin Goß, Akashdeep Kamra, Christian Spudat, Carola Meyer, Paul Kögerler, and Claus M. Schneider — Research Centre Jülich, Institute for Solid State Research, Electronic Properties, JARA-Jülich-Aachen Research Alliance, 52425 Jülich, Germany

Carbon nanotubes (CNTs) are known to possess superior mechanical and electronic properties that caused a lot of research in multiple fields of nanophysics. For transport measurements on CNTs and functionalized derivatives such as peapods isolated single-walled carbon nanotubes (SWNTs) are favourable. With the chemical vapour deposition (CVD) method such CNTs can be grown directly on substrates and their quality is governed by the catalyst used in the CVD procedure. Our experiments are motivated by a possible constriction of the CNT diameter distribution, which could facilitate the synthesis of peapods. Hence we investigated CNTs grown with molecular Mo₇₂Fe₃₀ nanoclusters as a catalyst by AFM, SEM and Raman spectroscopy. In comparison to our standard catalyst, which is composed of Fe clusters agglomerated at alumina nanoparticles, the molecular nanoclusters could enable the growth from highly defined catalyst particles. Additionally the role of the oxidation state of Mo for the growth mechanism is discussed.