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graphene chip

20.05.2006

Scientists from France and the USA have created a microcircuit from single-layer graphite. About two years ago, American scientists obtained another (if we count in the series graphite-diamond-carbine-fullerene-nanotube, then the sixth) form of carbon, namely a graphite sheet one atom thick. This form was called graphene.

As it turned out, such a substance may well compete with nanotubes in future devices of micro- (more precisely, nano-) electronics. Nanotubes are considered very promising because they conduct electric current well, while the electron in them exhibits interesting quantum properties. But it is difficult to assemble microcircuits from nanotubes. This requires non-standard equipment made on the basis of probe microscopes. And soldering nanotubes to other circuit elements is not easy.

“We came up with the idea that a nanotube is actually nothing more than a sheet of graphene rolled into a roll,” says Professor Walt de Heer from the Georgia Tech University. “Using thin strips of graphene, we will preserve all the unique properties of nanotubes. Because they are connected precisely with the structure of the network of carbon atoms, and not with how it is twisted.

Scientists heated a silicon carbide plate in a vacuum and ensured that all silicon atoms flew off its surface. It turned out, of course, not quite graphene, but a thin, ten interatomic distances thick, graphite film. Further, using standard methods of photolithography, that is, by applying masks and subsequent etching, standard microcircuit elements were obtained from a graphite film.

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