title: Electron microscopy characterization of nanostructured carbon obtained from chlorination of metallocenes and metal carbides.
abstract: 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 degrees 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< or =700 degrees C).
authors.affiliation: Departamento de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid E-28040, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Avila-Brande
authors.forename: Esteban
authors.initials: E
authors.lastname: Urones-Garrote
authors.forename: Nebil A
authors.initials: NA
authors.lastname: Katcho
authors.forename: Enrique
authors.initials: E
authors.lastname: Lomba
authors.forename: Adrián
authors.initials: A
authors.lastname: Gómez-Herrero
authors.forename: Angel R
authors.initials: AR
authors.lastname: Landa-Cánovas
authors.forename: L
authors.initials: L
authors.lastname: Carlos Otero-Díaz