Influence of acid treatments of carbon nanotube precursors on Ni/CNT in the synthesis of carbon nanotubes

The carbon nanotubes with high quality were synthesized with Ni supported on carbon nanotubes acid-treated for 6 h in dilute nitric acid, indicating that this kind of catalyst show higher activity in the synthesis of new carbon nanotubes than Ni catalyst supported on carbon nanotubes acid-treated for 0.5 h.