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|
|Copyright:||© 2008 American Chemical Society|
|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|
|Communicated by:||Robert Schlögl|
|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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