Coupling Epitaxy, Chemical Bonding, and Work Function at the Local Scale in Transition Metal-Supported Graphene

Bo Wang, Marco Caffio, Catherine Bromley, Herbert Anton Fruchtl, Renald Schaub

Research output: Contribution to journalArticlepeer-review

132 Citations (Scopus)

Abstract

Resonance tunneling spectroscopy and density functional theory calculations are employed to explore local variations in the electronic surface potential of a single graphene layer grown on Rh(111). A work function modulation of 220 meV is experimentally measured, indicating that the chemical bonding strength varies significantly across the supercell of the Moire pattern formed when graphene is bonded to Rh(111). In combination with high-resolution images, which provide precise knowledge of the local atomic registry at the carbon metal interface, we identify experimentally, and confirm theoretically, the atomic configuration of maximum chemical bonding to the substrate. Our observations are at odds with reported trends for other transition metal substrates. We explain why this is the case by considering the various factors that contribute to the bonding at the graphene/metal interface.

Original languageEnglish
Pages (from-to)5773-5782
Number of pages10
JournalACS Nano
Volume4
Issue number10
DOIs
Publication statusPublished - Oct 2010

Keywords

  • Graphene
  • Rhodium
  • Chemical bonding
  • Scanning tunneling microscopy
  • Density functional theory
  • Work function

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