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Characterization of Co-catalyzed Multiwalled Carbon Nanotubes by High-Resolution Transmission Electron Microscopy

Published online by Cambridge University Press:  11 February 2011

Chih-Chin Wang ,
Chuan-Pu Liu ,
Ruo-Mei Liu  and
Kuen-Hou Liao
Chih-Chin Wang
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan 701
Chuan-Pu Liu
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan 701
Ruo-Mei Liu
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan 701
Kuen-Hou Liao
Affiliation:
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan, Taiwan 701
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Abstract

The dependence of characteristics of multiwalled carbon nanotubes (MWCNT) on the microstructure of cobalt catalysts are intensively investigated by high-resolution transmission electron microscopy (HREM). The cobalt catalysts are prepared by either molecule beam epitaxy (MBE) or by DC magnetron sputtering, followed by MWCNT growth by microwave plasma CVD. The MBE-grown Co thin films consist of large epitaxial grains, whereas the Co nanoparticles of FCC or HCP crystal structures can be directly grown on Si(001) substrates by sputtering. Various HREM technologies are applied to completely characterize the microstructures of those Co catalysts and MWCNT. The results reveal that the morphology and microstructures of MWCNT are greatly controlled by the characteristics of Co catalysts. Better quality of carbon nanotube can be grown by FCC cobalt rather than HCP cobalt. The different effects of cobalt catalysts on MWCNT are discussed in this paper.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 737 , 2002 , F8.21
Copyright
Copyright © Materials Research Society 2003

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References

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