Abstract
Vapor-grown carbon fibers (VGCF) were produced from a methane-hydrogen mixture on a reconstituted graphite support using the [Fe3(CO)12] complex as catalyst precursor. The fibers thus produced were submitted to different oxidative treatments: nitric acid, oxygen plasma and partial gasification with air or carbon dioxide. The original and the oxidised fibers were characterised by X-ray diffraction, SEM, AFM, nitrogen adsorption, XPS and ToF-SIMS. The use of nitric acid or plasma as oxidation agents does not affect significantly the surface morphology of the fibers, but greatly increases the number of surface oxygen functions. The air and carbon dioxide treatments do not lead to significant increase either of the surface area, or of the quantity of surface oxygen containing groups, despite the important weight loss attained (50%). This peculiar observation has been interpreted by considering the presence of traces of iron at the fibers surface, which catalyse the gasification of carbon. Removal of this iron by acid washing allows an improvement of the specific surface area. A detailed study of the gasification in air gave valuable informations on the intimate structure of the VGCF.
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Figueiredo, J.L., Serp, P. (2001). Gasification and Surface Modification of Vapor-Grown Carbon Fibers. In: Biró, L.P., Bernardo, C.A., Tibbetts, G.G., Lambin, P. (eds) Carbon Filaments and Nanotubes: Common Origins, Differing Applications?. NATO Science Series, vol 372. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0777-1_8
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DOI: https://doi.org/10.1007/978-94-010-0777-1_8
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