Scanning tunneling spectroscopy of epitaxial graphene nanoisland on Ir(111)
1 Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, Halle, 06120, Germany
2 International Iberian Nanotechnology Laboratory, Avenida Mestre José Veiga,, Braga, 4715-310, Portugal
Nanoscale Research Letters 2012, 7:255 doi:10.1186/1556-276X-7-255Published: 15 May 2012
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).