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特許 係属中 Graphene (/ˈɡræf.iːn/)[1][2] is an allotrope of carbon in the form of a two-dimensional, atomic-scale, hexagonal lattice in which one atom forms each vertex. It is the basic structural element of other allotropes, including graphite, charcoal, carbon nanotubes and fullerenes. It can also be considered as an indefinitely large aromatic molecule, the limiting case[clarification needed] of the family of flat polycyclic aromatic hydrocarbons.