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Synthesis of γ-(Al1-xFex)2O3 solid solutions from oxinate precursors and formation of carbon nanotubes from the solid solutions using methane or ethylene as carbon source

Published online by Cambridge University Press:  31 January 2011

Valdirene G. de Resende
Affiliation:
Department of Subatomic and Radiation Physics, University of Ghent, B-9000 Gent, Belgium; and CIRIMAT UMR CNRS 5085/LCMIE, Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux, Université Paul-Sabatier, 31062 Toulouse cedex 9, France
Anne Cordier
Affiliation:
CIRIMAT UMR CNRS 5085/LCMIE, Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux, Université Paul-Sabatier, 31062 Toulouse cedex 9, France
Eddy De Grave
Affiliation:
Department of Subatomic and Radiation Physics, University of Ghent, B-9000 Gent, Belgium
Alicia Weibel
Affiliation:
CIRIMAT UMR CNRS 5085/LCMIE, Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux, Université Paul-Sabatier, 31062 Toulouse cedex 9, France
Alain Peigney
Affiliation:
CIRIMAT UMR CNRS 5085/LCMIE, Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux, Université Paul-Sabatier, 31062 Toulouse cedex 9, France
Geraldo M. da Costa
Affiliation:
Chemistry Department, Federal University of Ouro Preto, 35400-000, Ouro Preto (MG), Brazil
Christophe Laurent
Affiliation:
CIRIMAT UMR CNRS 5085/LCMIE, Centre Interuniversitaire de Recherche et d’Ingénierie des Matériaux, Université Paul-Sabatier, 31062 Toulouse cedex 9, France
Robert E. Vandenberghe
Affiliation:
Department of Subatomic and Radiation Physics, University of Ghent, B-9000 Gent, Belgium
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Abstract

This work reports for the first time the synthesis of γ-(Al1-xFex)2O3 solid solutions with a high specific surface area (200-230 m2/g) by the decomposition of metal oxinate [(Al1-xFex)(C9H6ON)3] and investigated the potential of these materials as catalysts for the synthesis of carbon nanotubes by catalytic chemical vapor deposition using methane or ethylene as carbon the source. The nanocomposite powders prepared by reduction in H2-CH4 contain carbon nanotubes (CNTs), which are mostly double-walled but also contain a fair amount of undesirable carbon nanofibers, hollow carbon particles, and metal particles covered by carbon layers. Moreover, abundant metallic particles are observed to cover the surfaces of the matrix grains. By contrast, the nanocomposite powders prepared by reduction in N2-C2H4 are not fully reduced, and the CNTs are much more abundant and homogeneous. However, they are multiwalled CNTs with a significant proportion of defects. The powders were studied by several techniques including Mössbauer spectroscopy and electron microscopy.

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Articles
Copyright
Copyright © Materials Research Society 2008

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Synthesis of γ-(Al1-xFex)2O3 solid solutions from oxinate precursors and formation of carbon nanotubes from the solid solutions using methane or ethylene as carbon source
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