Abstract
Spatial distributions of plasma temperature and densities of carbon species in DC arc discharge for generating carbon nanotubes have been investigated by measuring the spatial distributions of optical emission spectra as a function of pressure, current density for arc discharge, and cooling rate of the cathode. It is found that the nanotube yield is high when the temperature at the axial center of the cathode is higher than 6000 K so that the dominant species is in the arc flame carbon monomer. The potential drop at the cathode sheath, calculated from the model proposed by Rethfeld et al. [J. Phys. D 29 (1996) 121], is high for the high nanotube yield in comparison to that under the low yield conditions.
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