Effect of catalyst composition on carbon nanotube growth

Liao, X. Z.; Serquis, A.; Jia, Q. X.; Peterson, D. E.; Zhu, Y. T.; Xu, H. F.
April 2003
Applied Physics Letters;4/21/2003, Vol. 82 Issue 16, p2694
Academic Journal
Transmission electron microscopy was used to probe the compositions of individual Co-Mo bimetal catalyst particles and the morphologies of carbon nanotubes (CNTs) catalyzed by these particles under flowing carbon monoxide at 700°C. It was found that the composition of the catalyst particle at a CNT tip and the distribution of Co within the particle largely determine the morphology of the CNT. A particle with low Co content (<15 at. %) tends to produce a long CNT, while a particle with very high Co content (>85 at. %) tends to produce onion-like structures. These observations provide insight into the CNT growth mechanisms.


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