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Why is electronic structure of graphene nanoribbons (GNRs), having ultrathin width of 10nm, sensitive to the edge orientations?

Why is electronic structure of graphene nanoribbons (GNRs), having ultrathin width of 10nm, sensitive to the edge orientations? Correct Answer Greater surface interactions with the surroundings

The surface free energy of a material increases with its decreasing size and thus its properties start depending upon the surface interactions. This size effect is more prominent incase of nanomaterials having size in the range of 1-100nm. This is due to the fact that most of their atoms are exposed to the surface and interact with the surroundings. Hence, electronic structures of ultra-thin GNRs are sensitive to their edge orientations.

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