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

ID: 403270.0, Fritz-Haber-Institut / Inorganic Chemistry
In-situ X-ray Photoelectron Spectroscopy Study of Catalyst−Support Interactions and Growth of Carbon Nanotube Forests
Authors:Mattevi, Cecilia; Wirth, Christoph Tobias; Hofmann, Stephan; Blume, Raoul; Cantoro, Mirco; Ducati, Caterina; Cepek, Cinzia; Knop-Gericke, Axel; Milne, Stuart; Castellarin-Cudia, Carla; Dolafi, Sheema; Goldoni, Andrea; Schlögl, Robert; Robertson, John
Research Context:Carbon in catalysis
Date of Publication (YYYY-MM-DD):2008-08-14
Title of Journal:Journal of Physical Chemistry C
Journal Abbrev.:J. Phys. Chem. C
Issue / Number:32
Start Page:12207
End Page:12213
Copyright:© 2008 American Chemical Society
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We study catalyst support interactions during chemical vapor deposition of carbon nanotubes by in situ X-ray photoelectron spectroscopy over a wide range of pressures. We observe Fe 2+ and 3+ interface states for metallic Fe on Al2O3 in the absence of measurable Al reduction. This support interaction is much stronger than that on SiO2, and it restricts Fe surface mobility. The resulting much narrower Fe catalyst particle size distribution on Al2O3 leads to a higher carbon nanotube nucleation density and a vertical nanotube alignment due to proximity effects. We record the growth kinetics of carbon nanotube forests by optical imaging to understand effects that contribute to growth termination.
Free Keywords:nanoparticles; carbon nanotubes; in-situ XPS;
External Publication Status:published
Document Type:Article
Communicated by:Robert Schlögl
Affiliations:Fritz-Haber-Institut/Inorganic Chemistry
External Affiliations:Department of Engineering, University of Cambridge, Cambridge CB3 0FA, U.K.
Laboratorio Nazionale TASC-CNR-INFM, I-34012 Trieste, Italy,
IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, U.K.
Sincrotrone Trieste SCpA, I-34012 Trieste, Italy
Identifiers:URL:http://dx.doi.org/10.1021/jp802474g [only for subscriber]
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