Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 3: Inorganic/Organic Interfaces: Growth I
O 3.7: Vortrag
Montag, 16. März 2015, 12:00–12:15, MA 005
Polymer statistics of single P3HT molecules on Au(001) determined by STM — •Erik Kohl1, Stefan Förster1, and Wolf Widdra1,2 — 1Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Halle, Germany — 2Max-Planck-Institute für Mikrostrukturphysik, Halle, Germany
Using in-situ UHV electrospray deposition (ESD), isolated poly(3-hexylthiophene) (P3HT) molecules have been deposited on a Au(001) surface. Scanning tunneling microscopy (STM) reveals two different adsorption states of P3HT in the low coverage limit at room temperature: Strongly adsorbed polymer chains show fully stretched conformations, which result from a reorganization of the surface atoms in the presence of the polymer chain [1]. Additionally, weakly adsorbed molecules are present, which show two-dimensional random-coil like conformations.
For the weakly adsorbed P3HT species, the full statistical information is extracted from STM measurements. By tracing the experimentally observed chain configurations, the radius of gyration and the end-to-end distance of about 700 molecules of different polymer lengths have been extracted in the single chain limit [2].
[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)