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Graphene is made out of a single layer of graphite, a hexagonal lattice of carbon atoms, so thin that it is transparent, and essentially two-dimensional.
CREDIT
Wiikimedia Commons/Mohammad Javad Kiani, Fauzan Khairi Che Harun, Mohammad Taghi Ahmadi, Meisam Rahmani, Mahdi Saeidmanesh, Moslem Zare