Biomedical Engineering Reference
In-Depth Information
14.10
Proposed model for the transformation process of multi-walled
CNTs under O
2
plasma treatment. (a) Oxygen functional groups are
grafted by O
2
plasma; (b) defects and carbon nanowires are created by
ion bombardment, losing the superficial structure; (c) ions continue to
react with amorphous carbon which are peeled totally from the carbon
nanotubes; (d) amorphous carbon is oxidized under O
2
plasma which
forms carbon dioxide, the diameter of the multi-walled carbon
nanotubes decreases due to the disappearance of the outer wall (Xu
et al., 2007).
