Abstract: The V-type pyrolysis flame experimental system was introduced to synthesize carbon nanotubes. The carbon nanotubes from the experiment were characterized by scanning electron microscope and transmission electron microscope. The major factors including temperature, gas content, catalyst and equilibrium rate affected in carbon nanotubes synthesis were discussed. Carbon nanotubes with good morphology and less impurity can be captured when the temperature is from 800 ℃ to 1000 ℃, carbon monoxide/hydrogen/helium mixed gas flow is supplied and pentacarbonyl iron is served as the catalyst.

Key words: The V-type pyrolysis flame experimental system was introduced to synthesize carbon nanotubes. The carbon nanotubes from the experiment were characterized by scanning electron microscope and transmission electron microscope. The major factors including temperature, gas content, catalyst and equilibrium rate affected in carbon nanotubes synthesis were discussed. Carbon nanotubes with good morphology and less impurity can be captured when the temperature is from 800 ℃ to 1000 ℃, carbon monoxide/hydrogen/helium mixed gas flow is supplied and pentacarbonyl iron is served as the catalyst.