Open Access Nano Express

Scanning tunneling spectroscopy of epitaxial graphene nanoisland on Ir(111)

Soo-hyon Phark1*, Jérôme Borme12, Augusto León Vanegas1, Marco Corbetta1, Dirk Sander1 and Jürgen Kirschner1

Author affiliations

1 Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, Halle, 06120, Germany

2 International Iberian Nanotechnology Laboratory, Avenida Mestre José Veiga,, Braga, 4715-310, Portugal

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Citation and License

Nanoscale Research Letters 2012, 7:255  doi:10.1186/1556-276X-7-255

Published: 15 May 2012

Abstract

Scanning tunneling spectroscopy (STS) was used to measure local differential conductance (dI/dV) spectra on nanometer-size graphene islands on an Ir(111) surface. Energy resolved dI/dV maps clearly show a spatial modulation, which we ascribe to a modulated local density of states due to quantum confinement. STS near graphene edges indicates a position dependence of the dI/dV signals, which suggests a reduced density of states near the edges of graphene islands on Ir(111).