Abstract
Controlled atmosphere electron microscopy has been used to investigate the deposition of carbon on vanadium and molybdenum surfaces during the thermal decomposition of acetylene. Both metals were found to be active catalysts for carbon filament formation, whereas the carbides, VC and Mo 2C were found to be inactive. The filament growth kinetics indicates that these structures are produced via the same mechanism as that proposed for the production of filaments from the interaction of hydrocarbons with Fe, Ni and Co. It was also shown that the strength of the metal-support interaction can have a profound effect on the mode by which carbon filaments grow.
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