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Carbon Nanotubes' and Silicon Carbide Whiskers' Growth on Metal Catalysts: Common Features of Formation Mechanisms

Published online by Cambridge University Press:  01 February 2011

Vladimir Kuznetsov ,
Anna Usoltseva  and
Ilya Mazov
Vladimir Kuznetsov
Affiliation:
Boreskov Institute of Catalysis, Lavrentieva 5, 630090, Novosibirsk, Russia.
Anna Usoltseva
Affiliation:
Boreskov Institute of Catalysis, Lavrentieva 5, 630090, Novosibirsk, Russia.
Ilya Mazov
Affiliation:
Boreskov Institute of Catalysis, Lavrentieva 5, 630090, Novosibirsk, Russia.
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Abstract

The formation mechanisms of carbon deposits and silicon carbide whiskers on metal surface catalysts have some common steps. The most important are: (1) the formation of metal particle alloys oversaturated with carbon or silicon and carbon atoms and (2) the nucleation of corresponding deposits on the metal catalyst surface. A thermodynamic analysis of the carbon and/or silicon carbide nucleation on the metal surface was performed. The master equations for the dependence of critical radius of carbon or SiC nucleus on reaction parameters, such as reaction temperature, supersaturation degree of catalyst particles with C (or Si and C), work of adhesion of metal to carbon (or metal to SiC), were obtained. These equations combined with the phase diagram approach can be used for the description of different scenarios of carbon and/or SiC deposits formation and for the development of the main principles of catalyst and promoters design.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 858: Symposium HH – Functional Carbon Nanotubes , 2004 , HH3.14
Copyright
Copyright © Materials Research Society 2005

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References

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