Enhanced graphitization of c-CVD grown multi-wall carbon nanotube arrays assisted by removal of encapsulated iron-based phases under thermal treatment in argon

- Annealing of the c-CVD MWCNT arrays toward complete removal of iron nanoparticles.
- The ICP-AES protocol established for quantitative analysis of Fe-content in MWCNTs.
- The vertical alignment from the as-grown MWCNT arrays found intact after annealing.
- A route to decrease number of defects/imperfections in the MWCNT graphene walls.
- A foundation for commercial purification of c-CVD derived MWCNTs.