Carbon nanotubes were produced by the do arc-discharge evaporation of graphite electrodes in an atmosphere of rarefied gas of He, Ar or CH4. The co-existence of carbon nanoparticles with the nanotubes was observed by both scanning electron microscopy (SEM) and transmission electron microscopy (TEM) . The growth conditions of the carbon nanotubes were not so limited as those of fullerenes, such as C60.
