Nanotech 2008 Vol. 1
Nanotech 2008 Vol. 1
Nanotechnology 2008: Materials, Fabrication, Particles, and Characterization - Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 1

Carbon Nano Structures & Applications Chapter 1

Defect reduction of Multiwalled Carbon Nanotubes by Rapid Vacuum Arc Annealing

Authors: J.T.H. Tsai, J.S. Li, A.A. Tseng

Affilation: Tatung University, Taiwan

Pages: 122 - 124

Keywords: carbon nanotube, rapid thermal annealing, defect

A rapid thermal annealing process is demonstrated for defect reduction of multiwalled carbon nanotubes (MWCNTs) using a DC vacuum arc discharge system. The MWCNTs grown by chemical vapor deposition at a relatively low temperature (~650 °C) have structural imperfections which can be thermally annealed to reconstruct the graphitic structure. A vacuum arc discharge system was used to generate high temperatures (~ 1800 °C) followed by rapid cooling. The MWCNTs were rapidly annealed in this system by several cycles of fast heating (300 °C per sec.) and cooling (100 °C per sec.). The annealed samples were characterized by Raman spectroscopy and transmission electron microscopy. It was found that the defect density was reduced effectively by rapid thermal anneal. When inlet water vapor to the annealing chamber, the more defects were removed which indicate the oxygen may play an important role in combustion of the imperfect structures and removing the weakly bonded defects during the rapid heating cycles. After breaking the week bonds, the graphene shell was then reconstructed during the cooling process to produce multi-shell perfection. This method produces effective defect reduction of the MWCNTs.

Defect reduction of Multiwalled Carbon Nanotubes by Rapid Vacuum Arc Annealing

ISBN: 978-1-4200-8503-7
Pages: 1,118
Hardcopy: $159.95