Synthesis and Growth Mechanism of Carbon Filaments by Chemical Vapor Deposition without Catalyst

Abstract

Abstract:

Carbon filaments with diameter from several to hundreds micrometers were synthesized by chemical vapor deposition of methane without catalyst. The morphology, microstructure and mechanical properties of the carbon filament were investigated by scanning electronic microscopy, optical microscopy, X-ray diffraction and mechanical testing. The results show that the carbon filament is inverted cone shape and grows up along the gas flow direction. The stem of it is formed of annular carbon layers arranged in a tree ring structure while the head is made up of concentrical layers. The tensile strength of the carbon filament is increased after graphitization for the restructuring and growing large of graphene. The growth mechanism of carbon filament was proposed according to the results of two series of experiments with different deposition time and intermittent deposition cycles.

Key words: Carbon filaments, Pyrolytic carbon, Synthesis, Chemical vapor deposition, Mechanical property

Shuhe Liu,Feng Li,Shuo Bai. Synthesis and Growth Mechanism of Carbon Filaments by Chemical Vapor Deposition without Catalyst[J]. J Mater Sci Technol, 2009, 25(02): 259-263.

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