The structure of multi-wall carbon nanotubes: AA' stacked graphene helices

Details The structure of multi-wall carbon nanotubes: AA' stacked graphene helices The structure of multi-wall carbon nanotubes: AA' stacked graphene helices

2012-01-10

arxiv.org/abs/1201.2327v1

Physics

Condensed Matter

Materials Science

16 pages, 6 figures, 9 supporting information figures

Scientific paper

The structure of multi-wall carbon nanotubes has been attributed previously to disordered stacking of the graphene planes. Evidence is presented that the nanotubes analysed in this paper, occur with stacked graphene layers in the sequence of AA', where alternate graphene planes are translated by half the hexagon width. We further present proof that the crystalline materials comprise graphene helices (\sim 5 nm in width) rather than in the form of a perfect tube. The presence of the graphene helices, which subtend an angle of \approx30{\deg} to the tubule axis, has been directly confirmed by atomic force microscopy and high-resolution transmission electron microscopy. We also show that the structural model proposed here may be a common structure for multi-wall carbon nanotubes.

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