Electron microscopy characterization of nanostructured carbon obtained from chlorination of metallocenes and metal carbides

In this work we report some new well-defined carbon nanostructures produced by direct chlorination of metallocenes (ferrocene and cobaltocene) and NbC, at temperatures from 100 to 900 °C. Thus, amorphous carbon nanotubes with variable dimensions depending on reaction temperature were produced from f...

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Bibliographic Details
Published in:Micron (Oxford, England : 1993) England : 1993), 2007-01, Vol.38 (4), p.335-345
Main Authors: Ávila-Brande, David, Urones-Garrote, Esteban, Katcho, Nebil A., Lomba, Enrique, Gómez-Herrero, Adrián, Landa-Cánovas, Ángel R., Carlos Otero-Díaz, L.
Format: Article
Language:English
Subjects:
Carbon nanostructures
Cobaltocene
Disordered nanotubes
EELS
Ferrocene
Nano-cabbages
Niobium carbide
SEM
TEM
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Summary:In this work we report some new well-defined carbon nanostructures produced by direct chlorination of metallocenes (ferrocene and cobaltocene) and NbC, at temperatures from 100 to 900 °C. Thus, amorphous carbon nanotubes with variable dimensions depending on reaction temperature were produced from ferrocene. When cobaltocene is the carbon precursor the main product are solid amorphous nanospheres. The high refractory metal carbide NbC as carbon source favours the growth of nanospherical cabbage-like particles with a higher degree of graphene sheets order. Besides, NbC crystallites encapsulated in an amorphous carbon shell were also found at lower temperatures ( T ≤ 700 °C).
ISSN:0968-4328
1878-4291
DOI:10.1016/j.micron.2006.06.002