De Resende, Valdirene Gonzaga and Cordier, Anne and De Grave, Eddy and Weibel, Alicia and Peigney, Alain and Da Costa, Geraldo M. and Laurent, Christophe and Vandenberghe, Robert E. 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. (2008) Journal of Materials Research, vol. 23 (n° 11). pp. 3096-3111. ISSN 0884-2914
(Document in English)
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Official URL: http://dx.doi.org/10.1557/JMR.2008.0379
This work reports for the first time the synthesis of ?-(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.
|Additional Information:||Thanks to Materials Research Society editor. The definitive version is available at http://www.mrs.org The original PDF of the article can be found at Journal of Materials Research website : http://www.mrs.org/s_mr /sec_jmr.asp?CID=30&DID=48&SID=1|
|Audience (journal):||International peer-reviewed journal|
|Institution:||Other partners > Universidade Federal de Ouro Preto – UFOP (BRAZIL)|
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Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
|Deposited By:||Celine Cabaup|
|Deposited On:||16 Jun 2009 07:33|
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