C_60 molecule

Fullerene is a caged molecule made of carbon atoms. C_60 molecule is an example of fullerenes.

See detail in "Science of Fullerene and Carbon Nanotube" by M. S. Dresselhaus, G. Dresselhaus, and P. Eklund, Academic Press ISBN 0122218205 (1995).

Carbon Nanotube?
A carbon nanotube is a honeycomb lattice rolled into a cylinder. The nanotube diameter about 1 nm is much smaller in size than the most advanced semiconductor devices and thus carbon nanotube brings us the challenge for new solid state physics. One of the most significant physical properties of carbon nanotubes is their electronic structure which depends only on their geometry, and is unique to solid state physics. Specifically, the electronic structure of a single-wall carbon nanotube is either metallic or semiconducting, depending on its diameter and chirality, and does not requiring any doping. Further, the energy gap of semiconducting carbon nanotubes can be varied continuously from 1~eV to 0~eV, by varying the nanotube diameter. Thus we can imagine that the smallest possible semiconductor devices are likely to be based on carbon nanotubes.

See detail in "Physical Properties of Carbon Nanotubes", ``Science of Fullerenes and Carbon Nanotubes'', or The Nanotube Site at Professor D. Tomanek.

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