Purification of CVD synthesized single-wall carbon nanotubes by different acid oxidation treatments

Different acid oxidation methods were systematically carried out to purify the SWNTs synthesized by CVD. The results show that the best purification process can produce over 98% pure single-wall carbon nanotubes within 2 h. In this process, it is found by Raman characterization that the amount of nanotubes with small diameters do not diminish within 3 h.