Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 86: Nanostructure at Surfaces: Molecular Assembly
O 86.5: Vortrag
Donnerstag, 19. März 2015, 16:15–16:30, HE 101
A predictive model for the self-assembly of organic molecules on weakly interacting surfaces — •Joost van der Lit1, Jolien Marsman2, Nadine J. van der Heijden1, Stephan den Hartog1, Peter H. Jacobse1, Robertus J.M. Klein Gebbink3, Laura C. Filion2, and Ingmar Swart1 — 1Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, The Netherlands — 2Soft Condensed Matter, Debye Institute, Utrecht University, The Netherlands — 3Organic Chemisty and Catalysis, Debye Institute, Utrecht University, The Netherlands
Two-dimensional crystals of organic molecules on surfaces are highly attractive for applications ranging from molecular electronics to gas sensors to protective coatings[1]. The geometry of these crystals is an important parameter in determining their functionality. However, currently there is no model available that can be used to a-priori predict what crystal structures will form.
We developed a model, based on electrostatic and van der Waals interactions, that is capable of predicting the ordering of molecules on weakly interacting metal surfaces. Using scanning tunneling microscopy and atomically resolved atomic force microscopy, we studied the self-assembly of two different molecules on Au(111). These bis-acethylene molecules form different crystal structures. Our model correctly reproduces the two different crystal structures that we see experimentally. Additionally, we accurately reproduce the crystal structure of molecules whose self-assembly has been reported in literature.
1. L. Bartels, Nat. Chem., 2, 87-95, (2010)