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Intriguing field emission microscopy (FEM) images reflecting subnanometer‐sized structures of emitting sites and/or electronic orbitals have been observed from graphene edges. Graphene emitters with free edges (i.e. open edges) show a striped pattern (dubbed as a ‘lip pattern’) consisting of an array of streaked spots (or oval‐shaped spots); the direction of striation is perpendicular to the graphene...
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