Morphology of carbon nanotubes synthesized by thermal CVD under high magnetic field up to 10Â T

High magnetic fields up to 10 T are applied to thermal chemical vapor deposition (CVD) for carbon nanotube synthesis in order to control the nanotube morphology. Although changes of the nanotube morphology in the presence of magnetic field were not obviously discernible in the SEM images, an increase in the onion-like nano-carbons due to magnetic field was observed by TEM. It suggests that the magnetic field influences formation processes of nano-carbons including carbon nanotubes, via magnetic effects on metal catalysts.