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Support-Catalyst-Gas Interactions during Carbon Nanotube Growth on Metallic Ta Films

MPG-Autoren
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Blume,  Raoul
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Zitation

Bayer, B. C., Hofmann, S., Castellarin-Cudia, C., Blume, R., Baehtz, C., Esconjauregui, S., et al. (2011). Support-Catalyst-Gas Interactions during Carbon Nanotube Growth on Metallic Ta Films. The Journal of Physical Chemistry C, 115(11), 4359-4369. doi:10.1021/jp102986f.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0010-F5EA-3
Zusammenfassung
A detailed study of phase transformations and interactions during Fe catalysed chemical vapour deposition of carbon nanotubes on metallic, VLSI-compatible Ta support is presented. In-situ x-ray photoemission spectroscopy and x-ray diffraction reveal that the Fe catalyst increases the reactivity of Ta towards oxidation and carbide formation, whereas Ta promotes Fe reduction. This results in an unusual temperature dependence of the carbon nanotube yield: at high temperatures (> 600ºC) nanotube growth is sparse due to grain boundary diffusion of Fe through ready-formed, polycrystalline Ta2O5, whereas at low temperatures (~550ºC) vertically-aligned forests of carbon nanotubes readily grow on metallic Ta. The Fe-Ta model system highlights general material selection challenges for nanotube applications where conductive support is required.