Prepare a sheet showing an extended graphene structure, approximately 12 by 15 fused carbon rings or larger. Use this sheet to show how the graphene structure could be rolled up to form ( a ) a zigzag nanotube, ( b ) an armchair nanotube, and ( c ) a chiral nanotube. Is more than one chiral structure possible? (See M. S. Dresselhaus, G. Dresselhaus, and R. Saito, Carbon , 1995 , 33 , 883.)
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