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Densely Packed Perylene Layers on the Rutile TiO2(110)-(1 × 1) Surface

AuthorsOtero, Gonzalo CSIC ORCID; Martínez, José I. CSIC ORCID ; Lovat, Giacomo; Lanzilotto, Valeria; Méndez, Javier CSIC ORCID; López, María Francisca ; Floreano, Luca; Martín-Gago, José A. CSIC ORCID
Issue Date20-Mar-2015
PublisherAmerican Chemical Society
CitationJournal of Physical Chemistry C 119(14): 7809-7816 (2015)
AbstractWe have studied the interaction of perylene, a prototypical organic molecule, on the TiO2(110)-(1 × 1) surface at different surface coverages by an adequate combination of ultrahigh vacuum STM and UPS techniques, together with accurate “many-body” corrected ab initio calculations. We show that the molecular coupling and adsorption configuration strongly depend on the coverage. At the submonolayer coverage, the interaction is dominated by the van der Waals substrate attraction, which keeps the molecules in the troughs between adjacent oxygen rows. At this low-coverage regime no additional interaction is detected among the molecules, which rather behave like a 2D gas. When the coverage approaches the saturation of the first layer, a side-to-side molecular attraction sets in, which is shown to be mediated by a lateral intermolecular hybridization.
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