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A study of the interaction between perylene and the TiO2(1 1 0)-(1 × 1) surface-based on XPS, UPS and NEXAFS measurements |
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| Authors: | Jens Bæ k Simonsen,Bartosz Handke,Preben Juul Mø ller |
| Affiliation: | a Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK 1871 Frederiksberg C, Denmark b Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland c ISA, University of Aarhus, Ny Munkegade, Build. 520, DK 8000 Aarhus C, Denmark d Chemistry Department, University of Copenhagen, Universitetsparken 5, DK 2100 Copenhagen Ø, Denmark |
| Abstract: | The interaction between a semi-large aromatic hydrocarbon compound (perylene) and the TiO2(1 1 0)-(1 × 1) surface under ultra high vacuum conditions has been probed by X-ray photoemission spectroscopy (XPS), ultraviolet photoemission spectroscopy (UPS) and near-edge X-ray absorption fine structure (NEXAFS) methods. UPS measurements of the adsorbate system have been compared with an experimental UPS spectrum of perylene in the gas phase and a calculated spectrum obtained by means of density functional theory (DFT) methods. NEXAFS results of perylene molecules adsorbed on TiO2(1 1 0)-(1 × 1) were compared with data from an α-phase perylene single crystal. A novel analysis of the valence data has been employed to show that no strong chemical interaction takes place between perylene and the TiO2(1 1 0)-(1 × 1) surface. Furthermore, angle-dependent NEXAFS measurements and the growth curve results suggest that the perylene molecules are oriented flat down onto the TiO2 substrate due to weak van der Waals interactions. |
| Keywords: | Perylene Physical vapor deposition Rutile TiO2(1 1 0) Near-edge extended X-ray absorption fine-structure (NEXAFS) X-ray photoelectron spectroscopy (XPS) Ultraviolet photoelectron spectroscopy (UPS) Density functional calculations (DFT) |
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