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Top and side views of the optimized structure of the PPy/graphene sheets at (a) B bridge, (b) T top and (c) H hollow sites. Graphene carbon atoms are depicted grey. The PPy carbon atoms are depicted yellow, the nitrogen atom is blue, and hydrogen atoms are white. Side views show a distance d separating the PPy from the graphene surface. Reproduced with permission from [50]. Copyright 2018, Elsevier Science Ltd.
