title: Transformations of PTCDA structures on rutile TiO2 induced by thermal annealing and intermolecular forces.
abstract: Transformations of molecular structures formed by perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) molecules on a rutile TiO2(110) surface are studied with low-temperature scanning tunnelling microscopy. We demonstrate that metastable molecular assemblies transform into differently ordered structures either due to additional energy provided by thermal annealing or when the influence of intermolecular forces is increased by the enlarged amount of deposited molecules. Proper adjustment of molecular coverage and substrate temperature during deposition allows for fabrication of desired assemblies. Differences between PTCDA/TiO2(110) and PTCDA/TiO2(011) systems obtained through identical experimental procedures are discussed.
authors.affiliation: Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Łojasiewicza 11, 30-348 Krakow, Poland.
authors.forename: Szymon
authors.initials: S
authors.lastname: Godlewski
authors.affiliation: Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Łojasiewicza 11, 30-348 Krakow, Poland.
authors.forename: Jakub S
authors.initials: JS
authors.lastname: Prauzner-Bechcicki
authors.affiliation: Department of Physics, University of Basel, Klingelbergstr. 82, 4056 Basel, Switzerland.
authors.forename: Thilo
authors.initials: T
authors.lastname: Glatzel
authors.affiliation: Department of Physics, University of Basel, Klingelbergstr. 82, 4056 Basel, Switzerland.
authors.forename: Ernst
authors.initials: E
authors.lastname: Meyer
authors.affiliation: Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, Łojasiewicza 11, 30-348 Krakow, Poland.
authors.forename: Marek
authors.initials: M
authors.lastname: Szymoński
keywords: PTCDA, TiO2, rutile, self-assembly, STM