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Joachim Schnadt. Portrait.

Joachim Schnadt

Professor

Joachim Schnadt. Portrait.

The adsorption of iron phthalocyanine on graphite: A scanning tunnelling microscopy study

Author

  • John Åhlund
  • Joachim Schnadt
  • Katharina Nilson
  • Emmanuelle Goethelid
  • Joachim Schiessling
  • Flemming Besenbacher
  • Nils Mårtensson
  • Carla Puglia

Summary, in English

Different adsorption phases of iron phthalocyanine (FePc) on highly oriented pyrolitic graphite (HOPG) have been characterized by scanning tunnelling microscopy (STM). Evaporation of FePc onto the graphite (000 1) surface, kept at room temperature. results in the formation of three-dimensional molecular islands. After annealing to 400 degrees C different two-dimensional features Lire identified. depending on the initial coverage. At low doses. domains with well defined boundaries have been observed, within which molecules tend to organise in chains. At higher coverage, islands exhibiting well-ordered densely-packed square or hexagonal molecular arrangement have been resolved. For the adsorption structures corresponding to one monolayer islands our results show that the molecules adsorb with the molecular plane parallel to the surface. The high resolution STM images allow us to resolve the orientation of single molecules and Subsequently we suggest that the molecular monolayer is stabilized by van der Waals interactions. The characterization of the observed Moire contrast and a comparison with other similar systems underlines the importance of the central metal in the molecule-molecule and molecule-substrate interactions, which govern the molecular adsorption geometry. (c) 2007 Elsevier B.V. All rights reserved.

Department/s

  • Synchrotron Radiation Research
  • MAX IV Laboratory

Publishing year

2007

Language

English

Pages

3661-3667

Publication/Series

Surface Science

Volume

601

Issue

17

Document type

Journal article

Publisher

Elsevier

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • iron
  • phthalocyanine
  • graphite
  • scanning tunneling microscopy

Status

Published

ISBN/ISSN/Other

  • ISSN: 0039-6028