Initial growth of vertically aligned carbon nanofibers

Hongtao Cui; Xiaojing Yang; Simpson, Michael L.; Lowndes, Douglas H.; Varela, Maria
May 2004
Applied Physics Letters;5/17/2004, Vol. 84 Issue 20, p4077
Academic Journal
Samples of vertically aligned carbon nanofibers (VACNFs) were viewed transverse to the growth direction and studied using both scanning and transmission electron microscopy. The VACNFs are composed of graphite layers nearly parallel to the substrate at their bottom end, gradually formed graphite "cups" in the main body, and a catalyst particle on the tip. The formation of such structure is due to the corresponding transformation of the shape of the catalyst particle during initial VACNF growth. A model for their initial growth is proposed.


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