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Graphene is a one-atom-thick sheet of carbon atoms arranged in a honeycomb (hexagonal) pattern. Graphene is a one-atom-thick sheet of carbon atoms arranged in a honeycomb (hexagonal) pattern. Despite being just a single layer, it is roughly 200 times stronger than steel and offers excellent electrical and thermal conductivity. First isolated by Andre Geim and Konstantin Novoselov in 2004, graphene has moved steadily from laboratory curiosity toward industrial reality over the past two decades. T …