Observation of zigzag and armchair edges of graphite using scanning tunneling microscopy and spectroscopy

By Y. Kobayashi, K. Fukui, T. Enoki, K. Kusakabe, Y. Kaburagi. 2005

541 citations recorded by the source corpus.

The presence of structure-dependent edge states of graphite is revealed by both ambient and ultrahigh-vacuum (UHV) scanning tunneling microscopy and scanning tunneling spectroscopy observations. On a hydrogenated zigzag (armchair) edge, bright spots are (are not) observed together with a $(\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3})R30\ifmmode^\circ\else\textdegree\fi{}$ superlattice near the Fermi level (${V}_{S}\ensuremath{\sim}\ensuremath{-}30\phantom{\rule{0.3em}{0ex}}\mathrm{mV}$ for a peak of the local density of states) under UHV, demonstrating that a zigzag edge is responsible for the edge states, although there is no appreciable difference between as-prepared zigzag and armchair edges in air. Even in the hydrogenated armchair edge, however, bright spots are observed at defect points, at which partial zigzag edges are created in the armchair edge.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/e9f679c818c980b3cd090b4a6295886bc188d9a5

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In Atomic and Molecular Physics, and Optics

In Materials Chemistry

Citations in the corpus

Controlled nanocutting of graphene (2008, background): “Theoretical calculations have indicated that, depending on the size, geometry, and edge structure, graphene ribbons should display a variety of electronic properties [7 9].”
Restoration of graphene from graphene oxide by defect repair (2012, background): “H2 annealing can cause C–O bonds breaking and edge-passivation in GO [14,36].”
Electronic properties of mesoscopic graphene structures: Charge confinement and control of spin and charge transport (2011, background): “sion of longer-range hopping makes the band disperse (Refs. [51, 52, 55–58] and Appendix B2). 7 FIG. 5: (Color online) Scanning tunneling microscope image of diﬀerent graphene terminations, from Ref. [54]. (a) The termination of a graphene sample is investigated using a scanning tunneling microscope”