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Advances in Condensed Matter Physics
Volume 2008 (2008), Article ID 971457, 6 pages
Research Article

Synthesis and Optimization of MWCNTs on Co-Ni/MgO by Thermal CVD

1Energy Materials Research Centre, Korea Research Institute of Chemical Technology, P.O. Box 107, Yuseong, Daejeon 305-600, South Korea
2Laser Materials Development & Devices Division, Raja Ramanna Centre for Advanced Technology, Indore 452 013, India

Received 19 May 2008; Revised 9 July 2008; Accepted 15 July 2008

Academic Editor: Jörg Fink

Copyright © 2008 H. Ryu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Multiwalled carbon nanotubes (MWCNTs) were prepared by the thermal chemical vapor deposition (CVD) technique. Monometallic and bimetallic Co and Ni combinations were used as a catalyst on MgO support. The mixer of / was used as a carbon source. The prepared CNTs were found to possess different shapes, morphologies, and sizes. Maximum yield was found for 50% Co (MgO: 50% and Ni: 0%) catalyst at 600. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) techniques were used for structural analysis. Raman spectra were taken to investigate the quality and crystalline perfection of the prepared CNTs. The ratio of D- and G-bands () was measured from these spectra.