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Scanning Tunneling Microscopy study of Metal-free Phthalocyanine monolayer structures on Graphite
Uppsala University.
Uppsala University.
Uppsala University.
Uppsala University; Malardalen University. (ytbioteknik)
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2007 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 127, p. 114702-Article in journal (Refereed) Published
Abstract [en]

Low temperature scanning tunneling microscopy (STM) studies of metal-free phthalocyanine (H2Pc) adsorbed on highly oriented pyrolytic graphite (HOPG) have shown ordered arrangement of

molecules for low coverages up to 1 ML. Evaporation of H2Pc onto HOPG and annealing of the sample to 670 K result in a densely packed structure of the molecules. Arrangements of

submonolayer, monolayer, and monolayer with additional adsorbed molecules have been investigated. The high resolution of our investigations has permitted us to image single molecule

orientation. The molecular plane is found to be oriented parallel to the substrate surface and a square adsorption unit cell of the molecules is reported. In addition, depending on the bias voltage, different electronic states of the molecules have been probed. The characterized molecular states are in excellent agreement with density functional theory ground state simulations of a single molecule.

Additional molecules adsorbed on the monolayer structures have been observed, and it is found that the second layer molecules adsorb flat and on top of the molecules in the first layer. All STM

measurements presented here have been performed at a sample temperature of 70 K.

Place, publisher, year, edition, pages
2007. Vol. 127, p. 114702-
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mdh:diva-3096DOI: 10.1063/1.2770732ISI: 000249667400050Scopus ID: 2-s2.0-34648820177OAI: oai:DiVA.org:mdh-3096DiVA, id: diva2:115760
Available from: 2008-03-31 Created: 2008-03-31 Last updated: 2017-12-14Bibliographically approved

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