STM and STS of coronene on HOPG(0001) in UHV - Adsorption of the smallest possible graphite flakes on graphite

Markus Lackinger, Stefan Griessl, Wolfgang M. Heckl, Michael Hietschold

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The adsorption of the aromatic molecule hexabenzobenzene (coronene) on an HOPG(0001) surface was investigated under UHV conditions by means of variable temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Imaging on a mesoscopic scale showed a distribution of coronene islands. These islands are mobile on the surface and can be pinned at step-edges. Zooming in on areas apart from the islands reveals an hexagonal arrangement of coronene molecules in a closed layer. Submolecular resolved molecules consist of bright spots with varying intensity. This variation in intensity is explained with the commensurability of the adlayer. STS investigations were performed for various tip-sample distances, adjusted by the tunneling current setpoint. A gap can be seen for every setpoint, but its width is dependent on the setpoint. The gap for the largest tip-sample distance and therefore the smallest tip-sample interaction is compared with the theoretical value.

Original languageEnglish
Pages (from-to)685-687
Number of pages3
JournalAnalytical and Bioanalytical Chemistry
Volume374
Issue number4
DOIs
StatePublished - 2002
Externally publishedYes

Keywords

  • Adsorbate
  • Coronene
  • HOPG
  • STM
  • STS

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