Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 15: Postersitzung (Adsorption an Oberfl
ächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Rastersondentechniken, Zeitaufgelöste Spektroskopie, Methoden)
O 15.36: Poster
Freitag, 4. März 2005, 17:00–20:00, Poster TU D
Growth of thin polymer films: Monte Carlo simulations and experiments — •Christian Vree1, Johanna Röder2, Hans-Ulrich Krebs2, and S. G. Mayr1 — 1I. Physikalisches Institut, Universität Göttingen — 2Institut für Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen
Vapour deposition of thin polymer films was studied by Monte Carlo (MC) simulations and compared with experiments. In the MC simulations single chain molecules are deposited randomly on a lattice, on which they diffuse with the kinetic of the Reptation model. The dependence of roughness and morphology of the surface on film thickness, energy of deposited particles, relaxation time and chain length are investigated. Generally we observe a strong roughening, which starts abruptly at a critical thickness. In the experiment thin PMMA films were produced on a Si substrate using PLD and spin coating at room temperature. The film surfaces were characterized by atomic force microscopy and scanning electron microscopy.
Differences and similarities of experiment and modelling as well as their possible reasons are discussed.