Surface and electrosurface characterization of surface-oxidized multi-walled N-doped carbon nanotubes

- Treatment by oxidative acids produces on the CNT surface O-containing groups.
- The H2SO4/HNO3 acid mixture turned to be the most efficient.
- A big number of OH and some COOH groups on the CNTs surface detected.
- Electrokinetic behavior of CNT suspensions resembles that for lyophobic sols.
- A correlation between stability of CNTs suspension and zeta-potential of nanotubes.