The Inner Shell Influence on the Electronic Structure of Double-Walled Carbon Nanotubes


  • The authors are grateful to Dr. Paul Smith, Nano-Electronics Centre, for useful discussions and to Dr. Ewa Borowiak-Palen, Szczecin University of Technology, Poland, for her help regarding the purification of carbon nanotubes. This work is funded by the EPSRC through the Carbon Based Electronics program and the Portfolio Partnership Award.


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We present STM and STS results obtained for double-walled carbon nanotubes. In the case displayed here, the STS results exhibit the Van Hove singularities corresponding to semi conducting tubes for both the outer and the inner shell and a finite density of states at the Fermi level (EF) is observed for a DWNT. We associate this behavior to the presence of an intershell interaction.