Edges Bring New Dimension to Graphene Nanoribbons

  • Gunlycke D
  • Li J
  • Mintmire J
 et al. 
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Abstract

Chemistry at the edges of saturated graphene nanoribbons can cause ribbons to leave the plane and form three-dimensional helical structures. Calculations, based on density functional theory and enabled by adopting helical symmetry, show that F-terminated armchair ribbons are intrinsically twisted in helices, unlike flat H-terminated strips. Twisting ribbons of either termination couple the conduction and valence bands, resulting in band gap modulation. This electromechanical response could be exploited in switches and sensor applications.

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Authors

  • D Gunlycke

  • J W Li

  • J W Mintmire

  • C T White

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