Abstract
The discovery of the nanocarbons (fullerene, carbon nanotube, carbon onion and graphene) has attracted a lot of attention all over the world. Here a novel nanocarbons-concentric elliptical multi-shell carbon nanorings (CEMCNs) was reported under moderate electron beam irradiation (EBI) of fullerene-like carbon, which is topological closed-shell carbon with considerable size (about 47 nm in diameter and up to 30 shell layers). The distance between the shells decreases gradually to 0.35 nm from the core to the outer shells. Meanwhile the shells are gradually thinner, with the outermost shells been composed of a single layer of graphite. This study investigated the transformation mechanism of fullerene-like carbon into concentric elliptical multi-shell carbon nanorings, and provided the in-situ observation details.
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