Synthesis and characterization of carbon nanotubes from the V-type pyrolysis flame

Synthesis carbon nanotubes from V-type pyrolysis flame is a kind of novel technique. It has potential for utilization in mass production. This study aims to examine formation conditions for various carbon nanotubes in pyrolysis flame and to characterize their morphology and structure. Carbon monoxide is as carbon source and the acetylene/air premixed gas provides heat by combustion. Pentacarbonyl iron acted as catalyst precursor. The morphology and structural of carbon nanotubes were characterized by S-4800 type scanning electron microscope and JEM-2010 type transmission electron microscopy respectively. Typical carbon nanotubes can be captured in this method. Its diameter is approximate from 10 nm to 20 nm and its length is dozens of microns. The carbon nanotubes with special structure such as bamboo-like, pod-like, coil-like and diameter-change carbon nanotubes also can be seen on the sampling substrate. It was discussed and analyzed that the formation mechanism of bamboo- like, pod-like, coil-like and diameter-change carbon nanotubes.