Abstract
A high-resolution transmission electron microscopy (HRTEM) study of multi-walled carbon nanotubes (MWCNTs) produced by a variant of the arc-discharge process is described. It is found that the nanotubes are frequently coated with a disordered carbon, and that the tubes are often incompletely formed, with nanohorn-like structures attached to the caps. This suggests that carbon nanohorns may be the precursors for the formation of nanotubes by arc-discharge. A possible mechanism for this process is suggested.
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