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Epitaxial growth of C60 on highly oriented pyrolytic graphite surfaces studied at low temperatures
E Seydel1, R Hoffmann-Vogel1,2, M Marz1
1Physikalisches Institut, Karlsruhe Institute for Technology (KIT), D-76131 Karlsruhe, Germany.
Abstract:
Graphite surfaces interact weakly with molecules compared to other conducting surfaces, bringing the molecule-molecule interaction to the foreground. C60 on highly oriented pyrolytic graphite is a model system for studying the molecular self-assembly on surfaces. Our scanning tunneling microscopy measurements at liquid nitrogen temperatures confirm the previously observed island growth mode. Our results indicate that there is an epitaxial relationship of the molecular islands and the substrate with three possible orientations of the islands. For one of these orientations, we determine this epitaxial relationship by analyzing in detail an image taken across a C60 island step edge. In this image we have obtained high-resolution on both the molecular island and the substrate. The result of this analysis is confirmed by two-dimensional Fourier analysis.
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