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Electron spectroscopy study of the initial stages of iron phthalocyanine growth on highly oriented pyrolitic graphite
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Surface and Interface Science.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Surface and Interface Science.
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2009 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 131, no 21, 214709- p.Article in journal (Refereed) Published
Abstract [en]

The nature of the intermolecular and substrate bonds of iron   phthalocyanine adsorbed on highly oriented pyrolitic graphite has been   investigated by x-ray photoelectron spectroscopy and x-ray absorption   spectroscopy. We find that the molecules grow in a highly ordered   fashion with the molecules essentially plane-parallel to the surface in   both the mono- and multilayers. The spectra obtained on both types of   film are virtually identical, which shows that the bonds both between   the adsorbate and substrate and between the molecular layers have a   pure van der Waals nature. Supporting density functional theory results   indicate that the layers are stabilized by weak hydrogen bonds within   the molecular layers.

Place, publisher, year, edition, pages
2009. Vol. 131, no 21, 214709- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-95720DOI: 10.1063/1.3259699ISI: 000272494300034OAI: oai:DiVA.org:uu-95720DiVA: diva2:170039
Available from: 2007-04-13 Created: 2007-04-13 Last updated: 2011-02-23Bibliographically approved
In thesis
1. Electronic and Geometrical Structure of Phthalocyanines on Surfaces: An Electron Spectroscopy and Scanning Tunneling Microscopy Study
Open this publication in new window or tab >>Electronic and Geometrical Structure of Phthalocyanines on Surfaces: An Electron Spectroscopy and Scanning Tunneling Microscopy Study
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Core- and Valence Photoelectron Spectroscopy (PES), X-ray- and Ultraviolet-Visible Absorption Spectroscopy (XAS and UV-Vis), Scanning Tunneling Microscopy (STM) and Density Functional Theory (DFT) calculations are used to study the electronic and geometrical structure of a class of macro-cyclic molecules, Phthalocyanines (Pc), on surfaces. These molecules are widely studied due to their application in many different fields.

Multilayer and monolayer coverages of Iron Phthalocyanine (FePc) and metal-free Phthalocyanine (H2Pc) deposited on different surfaces are investigated in order to get insight in the electronic and geometrical structure of the obtained overlayers, of crucial importance for the understanding of the film functionality. Sublimation of molecular thick films on Si(100) and on conducting glass results in films with molecules mainly oriented with their molecular plane orthogonal to the surface. Ex-situ deposited H2Pc films on conductive glass show different molecular orientation and morphology with respect to the vacuum sublimated films.

We study the monolayer adsorption structure of FePc and H2Pc and compare our results with other Pc’s adsorbed on graphite. We find that the molecular unit cell and the superstructure is characteristic for each Pc adsorbed on graphite, even if the geometrical size of the compared molecules is the same. The PE- and XA- spectra of FePc on graphite are essentially identical for the mono- and multilayer preparations, evidencing weak intermolecular and molecular-substrate interactions of van der Waals nature.

Furthermore, we characterize Pc’s on InSb (001)-c(8x2). The substrate In rows are observed to be the adsorption site for Pc’s. We find that the growth of the two-dimensional islands of FePc is prolonged in the [-110] direction, in contrast to ZnPc adsorbed on the same substrate at room temperature. We interpret this result as an indication that the adsorption is controlled by the substrate corrugation observed at 70 K.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 67 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 291
Keyword
Physics, PhotoElectron Spectroscopy (PES), X-ray Absorption Spectroscopy (XAS), UltraViolet-Visible absorption spectroscopy (UV-Vis), Scanning Tunneling Microscopy (STM), Phthalocyanine (Pc), Iron Phthalocyanine (FePc), metal-free Phthalocyanine (H2Pc), Zinc Phthalocyanine (ZnPc), Graphite (HOPG), Indium Antimony (InSb), Surface science, Fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-7802 (URN)978-91-554-6856-9 (ISBN)
Public defence
2007-05-04, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2007-04-13 Created: 2007-04-13 Last updated: 2012-03-28Bibliographically approved

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