High-purity carbon nanotubes synthesis method by an arc discharging in magnetic field

We developed a synthesis method of multiwalled carbon nanotubes (MWNTs), in which an arc discharging was controlled by a magnetic field. Using this method, we can obtain high-purity MWNTs (purity >95%) without purification which disorders walls of MWNTs. The current–voltage measurements show that the carriers would transport ballistically through our defect-free MWNTs with the maximum current density of ${\text{∼10}}^{11}\hspace{0.17em}{\mathrm{A/m}}^2.$ Therefore, our method provides defect-free/high-purity MWNTs as nanosized electric wires for device fabrication.