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Which of the following is the correct pair of edge structures for graphene nanoribbons?

Which of the following is the correct pair of edge structures for graphene nanoribbons? Correct Answer Zig-Zag and Armchair

There are many edge topologies for graphene. Armchair and Zig-Zag are the two main types of edges. For graphene nanoribbons, if it is zig-zag, bandgap is zero, while if it is armchair then bandgap is non-zero.

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