Flattened carbon nanoshells, carbon nanorods, rind nanostructures of rod-tu
be have been observed in the cathodic deposits produced by a double-anode a
re-discharge. As confirmed by high resolution transmission electron microsc
ope (HRTEM), the growth of;a carbon nanotube was directly linked to the nan
orod, so the origin and development of nanotube seed is clearly discernible
. In addition, the multishelled carbon nanorods HRTEM images revealed an is
olated center line. We consider that such a line is probably a linear acety
lenic carbon allotrope. based on "sp" hybridization containing triple and s
ingle bonds.