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Catalytic chemical vapor deposition synthesis of double-walled and few-walled carbon nanotubes by using a MoO3-supported conditioning catalyst to control the formation of iron catalytic particles within an α-Al1.8Fe0.2O3 self-supported foam

Cordier, Anne and De Resende, Valdirene Gonzaga and Weibel, Alicia and De Grave, Eddy and Peigney, Alain and Laurent, Christophe Catalytic chemical vapor deposition synthesis of double-walled and few-walled carbon nanotubes by using a MoO3-supported conditioning catalyst to control the formation of iron catalytic particles within an α-Al1.8Fe0.2O3 self-supported foam. (2010) Journal of Physical Chemistry C, 114 (45). 19188-19193. ISSN 1932-7455

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Official URL: http://dx.doi.org/10.1021/jp105712q

Abstract

α-Al1.8Fe0.2O3 and α-Al1.8Fe0.2O3-MoO3 self-supported foams are used as catalytic materials for the synthesis of carbon nanotubes by catalytic chemical vapor deposition. A MoO3-supported conditioning catalyst placed upstream in the reactor is more efficient than MoO3 present within the catalytic material in producing doublewalled and few-walled carbon nanotubes with fewer defects. It is shown that the corresponding modifications of the gas atmosphere (presence of H2O formed by the H2 reduction of MoO3 and, therefore, lower H2 and CH4 concentrations) allow one to limit more efficiently the release of the Fe catalyst from the oxide solidsolution foam, which results in the formation of fewer Fe nanoparticles, which, therefore, are less prone to undesirable growth. Thus, a MoO3-induced "solid-state" effect is demonstrated within the catalytic material without molybdenum species being themselves present within this material. This could lead to simplifications in the design of catalytic materials.

Item Type:Article
Additional Information:Thanks to American Chemical Society Journals editor. The definitve version is available at http://pubs.acs.org/doi/abs/10.1021/jp105712q
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Universiteit Gent - UGENT (BELGIUM)
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Deposited By: cirimat webmestre
Deposited On:06 Sep 2013 13:47

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