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  • 1. Nilson, Katharina
    et al.
    Palmgren, Pål
    Åhlund, John
    Schiessling, Joachim
    Göthelid, Emmanuelle
    Mälardalen University, School of Sustainable Development of Society and Technology. Mälardalen University, Department of Biology and Chemical Engineering.
    Mårtensson, Nils
    Puglia, Carla
    Göthelid, Mats
    STM and XPS characterization of zinc phthalocyanine on InSb(0 0 1)2008In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 602, no 2, p. 452-459Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    Zinc phthalocyanine (ZnPc) adsorbed on the InSb(0 0 1)-c(8 × 2) surface has been studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Coverages from sub-monolayer to monolayer (ML) have been investigated. The molecules form ordered structures on the reconstructed rows of the surface with the molecular plane parallel to the surface. A change in the electronic structure between the sub-ML and higher coverages has been observed. Moreover, in order to study the influence of annealing on the electronic and geometric structures, the samples have been heated to elevated temperatures (about 640 K). In addition, multi-layer ZnPc films have been characterized by XPS measurements.

  • 2.
    Åhlund, John
    et al.
    Uppsala University.
    Schnadt, Joachim
    University of Aarhus; University of Lund, Sweden.
    Nilson, Katharina
    Uppsala University.
    Göthelid, Emmanuelle
    Uppsala University; Department of Biology and Chemical Engineering, Mälardalen University, Sweden .
    Schiessling, Joachim
    Uppsala University.
    Mårtensson, Nils
    Uppsala University.
    Besenbacher, Flemming
    University of Aarhus,.
    Puglia, Carla
    Uppsala University.
    The adsorption of iron phthalocyanine on graphite: A scanning tunnelling microscopy study2007In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 601, no 17, p. 3661-3667Article in journal (Refereed)
    Abstract [en]

    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 (0 0 0 1) surface, kept at room temperature, results in the formation of three-dimensional molecular islands.

    After annealing to 400 °C different two-dimensional features are 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 Moiré 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.

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