The influence of edge structure on the electronic properties of graphene quantum dots and nanoribbons

Kyle A. Ritter, Joseph W. Lyding

Research output: Contribution to journalArticle

Abstract

Graphene shows promise as a future material for nanoelectronics owing to its compatibility with industry-standard lithographic processing, electron mobilities up to 150 times greater than Si and a thermal conductivity twice that of diamond. The electronic structure of graphene nanoribbons (GNRs) and quantum dots (GQDs) has been predicted to depend sensitively on the crystallographic orientation of their edges; however, the influence of edge structure has not been verified experimentally. Here, we use tunnelling spectroscopy to show that the electronic structure of GNRs and GQDs with 2-20 nm lateral dimensions varies on the basis of the graphene edge lattice symmetry. Predominantly zigzag-edge GQDs with 7-8 nm average dimensions are metallic owing to the presence of zigzag edge states. GNRs with a higher fraction of zigzag edges exhibit a smaller energy gap than a predominantly armchair-edge ribbon of similar width, and the magnitudes of the measured GNR energy gaps agree with recent theoretical calculations.

Original languageEnglish (US)
Pages (from-to)235-242
Number of pages8
JournalNature Materials
Volume8
Issue number3
DOIs
StatePublished - Mar 2009

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Nanoribbons
Carbon Nanotubes
Graphite
Electronic properties
Graphene
Semiconductor quantum dots
graphene
quantum dots
electronics
Electronic structure
Energy gap
Diamond
Nanoelectronics
electronic structure
Electron mobility
electron mobility
Diamonds
Thermal conductivity
compatibility
ribbons

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

The influence of edge structure on the electronic properties of graphene quantum dots and nanoribbons. / Ritter, Kyle A.; Lyding, Joseph W.

In: Nature Materials, Vol. 8, No. 3, 03.2009, p. 235-242.

Research output: Contribution to journalArticle

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