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Relationship Between Geometric Structures of Catalyst Particles and Growth of Carbon Nanocoils

โœ Scribed by Da-Wei Li; Lu-Jun Pan; Dong-Ping Liu; Nai-Sen Yu

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
342 KB
Volume
16
Category
Article
ISSN
0948-1907

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โœฆ Synopsis

Abstract

The relationship between the geometric structures of catalyst particles and the growth of carbon nanocoils (CNCs) is investigated. It is found that the CNCs usually consist of over two, but less than five tubules. The catalyst particles at the tips of CNCs are all polyhedron structures, in most cases, hexahedron. It is considered that a catalyst particle has two kinds of crystal facets, the catalytically active facet and the carbon precipitation facet. The active facet mainly plays the roles of decomposition of hydrocarbon and diffusion of the formed carbon atoms, while carbon tubules are grown from the precipitation facets and twisted to form a carbon coil. Catalysts with different numbers of active facets and geometric structures form different types of CNCs.

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