期刊
CARBON
卷 41, 期 15, 页码 2897-2912出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-6223(03)00329-4
关键词
vapor grown carbon; carbon nanotubes; catalytically grown carbon; chemical vapor deposition; scanning electron microscopy
The chemical vapor deposition of the pyrocarbon from a CH4+H-2 mixture is investigated using nanofilamentous substrates. The process consists of growing carbon nanotubes via a catalytic process, which then are thickened by pyrolytic carbon deposition to reach diameters in the nanometer to micrometer range. A key characteristic of the experimental reactor used was the long length of its isothermal zone, preceded (and followed) by a low thermal gradient zone. This allowed us to investigate the role of the variation of the local gas phase composition, which depends on the post-cracking secondary reactions, and on the quantity and quality of the deposited carbon. The 'time of flight' of the reactive species was found to be a leading parameter in the pyrolytic carbon deposition process. Various nanometric and micrometric morphologies, several of which are new, were synthesised and found constituted with an association of different sub-morphologies. The various morphologies, that can be sorted following a factor of morphological complexity, were investigated by scanning electron microscopy. (C) 2003 Elsevier Ltd. All rights reserved.
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