Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 66: Nanostructures at surfaces III

O 66.6: Talk

Thursday, March 29, 2012, 11:45–12:00, MA 042

Anisotropic behavior of organic molecules on prepatterned surfaces — •Stefan Frieder Hopp and Andreas Heuer — Institut für Physikalische Chemie, Universität Münster, 48149 Münster, Germany

The nucleation of organic molecules on surfaces, prepatterned with gold stripes, is investigated with emphasis on anisotropy effects. Representing the molecules as ellipsoids, the related particle-particle interaction is modeled by means of a generalized Gay-Berne potential for similar biaxial particles [1]. The orientational behavior of these ellipsoidal molecules with respect to the stripe pattern is studied for the first monolayer by performing kinetic Monte Carlo simulations. It is shown how the properties of the particle alignment depend on energy scales, temperature and flux. Based on the fact the particles strictly arrange in rows, it is furthermore instructive to analyze the orientation behavior within the different rows. Finally, the transfer of orientation from a preset row of molecules with fixed orientation to other nucleating particles is examined.

[1] R. Berardi, C. Fava and C. Zannoni, Chem. Phys. Lett. 236, 462 (1995).