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Dielectric response of pentagonal defects in multilayer graphene nano-cones

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Author(s)

  • Fredrik S. Hage
  • D. M. Kepaptsoglou
  • C R Seabourne
  • Q. M. Ramasse
  • Andrew J. Scott
  • O. Prytz
  • A. E. Gunnæs
  • G. Helgesen

Department/unit(s)

Publication details

JournalNanoscale
DatePublished - 7 Feb 2014
Issue number3
Volume6
Number of pages7
Pages (from-to)1833-1839
Original languageEnglish

Abstract

The dielectric response of pentagonal defects in multilayer graphene nano-cones has been studied by electron energy loss spectroscopy and ab initio simulations. At the cone apex, a strong modification of the dielectric response is observed below the energy of the π plasmon resonance. This is attributed to π → π* interband transitions induced by topology-specific resonant π bonding states as well as π*-σ* hybridization. It is concluded that pentagonal defects strongly affect the local electronic structure in such a way that multi-walled graphene nano-cones should show great promise as field emitters.

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