Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5424583 | Surface Science | 2009 | 6 Pages |
Abstract
The interaction between a semi-large aromatic hydrocarbon compound (perylene) and the TiO2(1 1 0)-(1 Ã 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 Ã 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 Ã 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
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Jens Bæk Simonsen, Bartosz Handke, Zheshen Li, Preben Juul Møller,