Graphene nanoribbons with low defect densities and large energy gaps can be fabricated by chemically unzipping carbon nanotubes and annealing the result.
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Roche, S. Graphene gets a better gap. Nature Nanotech 6, 8–9 (2011). https://doi.org/10.1038/nnano.2010.262
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DOI: https://doi.org/10.1038/nnano.2010.262
