Regensburg 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 77: Organic Molecules on Inorganic Substrates V: Solid-Liquid Interfaces, Self-Organization, Ordering
O 77.6: Vortrag
Donnerstag, 4. April 2019, 11:45–12:00, H9
Structure of individual polythiophene molecules on Ag(111) — •Erik Schreck1, Stefan Förster1, and Wolf Widdra1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany — 2Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany
This talk presents a low-temperature scanning tunneling microscopy (STM) study of Poly(3-hexylthiophene) (P3HT) polymers on Ag(111). Submonolayer films were prepared by electrospray deposition under ultra-high vacuum conditions. Side chain resolved STM images reveal individual polymers and polymers forming condensed 2D structures. The distributions of end-to-end distance, radius of gyration and persistence length are derived by image analysis and are interpreted in terms of a 2D self-avoiding random walk.
In 2D condensates, we find enlarged persistence length and distinct bending angles between parallel polymer segments in comparison to isolated polymers. For the individual chains, the persistence length is smaller on Ag(111) than for Au(001)[2], which is discussed based on modified polymer-substrate interactions.
[1] S. Förster and W. Widdra, J. Chem. Phys. 141, 054713 (2014)
[2] S. Förster, E. Kohl, M. Ivanov, J. Gross, W. Widdra and W. Janke, J. Chem. Phys. 141, 164701 (2014)