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Solid-liquid-solid growth mechanism of single-wall carbon nanotubes
Authors:A Gorbunov  O JostW Pompe  A Graff
Affiliation:a Dresden University of Technology, D-01062 Dresden, Germany
b Institute for Solid State and Materials Research (IFW), D-01069 Dresden, Germany
Abstract:
Reasons are presented which suggest that the liquefaction of the catalytic particles is a decisive condition for formation of single wall carbon nanotubes (SWNTs) by physical synthesis techniques. It is argued that the SWNT growth mechanism is a kind of solid-liquid-solid graphitization of amorphous carbon or other imperfect carbon forms catalyzed by molten supersaturated carbon-metal nanoparticles. The assumption of low temperature melting of these nanoparticles in contact with amorphous carbon followed by its precipitation in the form of SWNTs allows to explain qualitatively the experimentally observed SWNT growth rates and temperature dependence of the SWNT yield. Guidelines for increasing SWNT yield are proposed.
Keywords:A. Carbon nanotubes   Catalytically grown carbon   B. Graphitization   D. Diffusion
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