Single-Molecule Junctions with Epitaxial Graphene Nanoelectrodes

Konrad Ullmann, Pedro B. Coto, Susanne Leitherer, Agustin Molina-Ontoria, Nazario Martin, Michael Thoss, Heiko B. Weber

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

On the way to ultraflat single-molecule junctions with transparent electrodes, we present a fabrication scheme based on epitaxial graphene nanoelectrodes. As a suitable molecule, we identified a molecular wire with fullerene anchor groups. With these two components, stable electrical characteristics could be recorded, Electrical measurements show that single-molecule junctions with graphene and with gold electrodes display a striking agreement. This motivated a hypothesis that the differential Conductance spectra are rather insensitive to the electrode material. It is further corroborated by the assignment of asymmetries and spectral features to internal molecular,degrees of freedom. The demonstrated open access graphene electrodes and the electrode-insensitive, molecules provide a model system that will allow for a thorough investigation of an individual single,molecule contact with additional probes.
Original languageEnglish
JournalNano letters
Volume15
Issue number5
Pages (from-to)3512-3518
ISSN1530-6984
DOIs
Publication statusPublished - 2015
Externally publishedYes

Keywords

  • Epitaxial graphene nanoelectrodes
  • Electroburning
  • Fullerene end groups
  • Single-molecule junctions
  • Switching

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