Carbon nanotubes were produced by plasma discharging of graphite electrodes
in air at 1 atm. The combined yield of CNTs and carbon nanoparticles is si
milar to 20 wt % relative to the mass of cathode deposits or 14 wt% of grap
hite electrode consumed. The yields of CNTs and carbon nanoparticles under
different inert gas atmospheres, such as He, Ar, N-2, and air were compared
.