Journal
SURFACE AND INTERFACE ANALYSIS
Volume 42, Issue 10-11, Pages 1637-1641Publisher
WILEY
DOI: 10.1002/sia.3583
Keywords
graphene; chemical vapor deposition; zigzag edge; edge state; scanning tunneling microscopy
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Single-layer graphene islands with a typical diameter of several nanometers were grown on a Pt (111) substrate. Scanning tunneling microscopy (STM) analysis showed most of islands are hexagonally shaped and the zigzag-type edge predominates over the armchair-type edge. The apparent height at the atoms on the zigzag edge is enhanced with respect to the inside atoms for a small sample bias voltage, while such an enhancement was not observed at the atoms on the armchair edge. This result provides an experimental evidence of spatially (at the zigzag edge) and energetically (at the Fermi level) localized edge state in the nanographene islands, which were prepared chemically on Pt (111). Copyright (C) 2010 John Wiley & Sons, Ltd.
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