Graphene sheet. Computer illustration showing the structure of a graphene sheet. Graphene is a single layer of graphite - a structurally distinct form (allotrope) of carbon. It is composed of hexagonally arranged carbon atoms (spheres) linked by strong covalent bonds (rods). Graphene is very strong and flexible and transports electrons highly efficiently and may one day replace silicon in computer chips and other technology applications. It was discovered by Andre Geim in 2004.
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