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          Institute: Fritz-Haber-Institut     Collection: Inorganic Chemistry     Display Documents



  history
ID: 476739.0, Fritz-Haber-Institut / Inorganic Chemistry
Support-Catalyst-Gas Interactions During Carbon Nanotube Growth on Metallic Ta Films
Authors:Bayer, Bernhard C.; Hofmann, Stephan; Castellarin-Cudia, Carla; Blume, Raoul; Baehtz, Carsten; Esconjauregui, Santiago; Wirth, Christoph Tobias; Oliver, R. A.; Ducati, C.; Knop-Gericke, Axel; Schlögl, Robert; Goldoni, Andrea; Cepek, Cinzia; Robertson, John
Language:English
Research Context:Carbon in catalysis
Date of Publication (YYYY-MM-DD):2011
Title of Journal:Journal of Physical Chemistry C
Journal Abbrev.:J. Phys. Chem. C
Volume:115
Issue / Number:11
Start Page:4359
End Page:4369
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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.
Free Keywords:carbon nanotube; CVD; catalyst-support interactions; XPS; XRD
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry/Electronic Structure and Adsorption / Metals
Fritz-Haber-Institut/Inorganic Chemistry/Inorganic Chemistry
External Affiliations:Engineering Department, University of Cambridge, Cambridge, CB3 0FA, UK
Istituto Officina dei Materiali-CNR, Laboratorio TASC, s.s. 14 km 163.5, I-34149 Trieste, Italy
Sincrotrone Trieste SCpA, s.s. 14 km 163.5, I-34149 Trieste, Italy
Institute of Ion Beam Physics and Materials Research, Forschungszentrum Dresden Rossendorf, D-01314 Dresden, Germany
Identifiers:URL:http://dx.doi.org/10.1021/jp102986f [only subscriber]
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