Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 179, Issue 1-3, Pages 11-22Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2006.03.103
Keywords
carbide derived carbon; silicon carbide; carbon; transmission electron microscopy; nanopores
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Carbide derived carbon (CDC) produced by etching SiC in halogens has been investigated using transmission electron microscopy (TEM). Depending on experimental conditions, CDC may contain sp(3)- or sp(2)-bonded carbon phases. Amorphous carbon, poorly ordered turbostratic carbon with lattice spacing exceeding values of 0.35 mn as well as highly ordered graphite were observed. sp(3)-Bonded structures consist of mainly lonsdaleite and cubic diamond nanocrystals. Hexagonal diamond polytypes and n-diamond have been synthesized. During the annealing process, diamond nanocrystals eventually transform to sp(2)-bonded carbons. The transformation process of hexagonal diamond nanocrystals produces spherical onion type structures. These structures appear either hollow or dense. The latter shows a decrease in lattice spacing compared to d/n values for graphite. Graphitic structures include multi-wall nanotubes, polyhedral particles and ribbons. The graphitization during chlorination of samples may eventually lead to the formation of planar graphite. (c) 2006 Elsevier B.V. All rights reserved.
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