CIF file of a graphene nanotube?
There are a lot of online and offline tools to generate CNT structure from its (n,m) indexes. For offline you might try ASE or avogadro. One online example is http://turin.nss.udel.edu/research/tubegenonline.html
You can use VMD. Follow this: Extensions>Modeling>Nanotube Builder
Then you can choose desired chirality number (n,m), length, Number of layers, Graphene edge type.
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