Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 12: Morphology Prediction at Interfaces

O 12.8: Talk

Monday, March 7, 2016, 16:45–17:00, S051

Interface formation of aromatic molecules on a metal/metal-oxide nano-template mediated by lateral and vertical interactions — •Alexander Timmer, Harry Mönig, Oscar Díaz Arado, Saeed Amirjalayer, Martin Uphoff, and Harald Fuchs — Physikalisches Institut, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

The self-assembly of organic molecules on pre-structured surfaces is a promising approach to steer precise arrangement of molecular nano-structures. The Cu(110)-(2x1)-O added row reconstruction of a partially oxidized Cu(110) surface, where added Cu and O atoms are arranged in a striped super-grating along the [100] direction, forms an interesting nano-template exhibiting a well-defined lateral metal/metal-oxide phase boundary. Previous studies showed that various organic compounds exclusively adsorb on the pure metal domains. By STM imaging we confirm this finding for different polycyclic aromatic hydrocarbons. For low coverages, these molecules predominantly decorate the metal/metal-oxide boundaries of the (2x1)-O strings in a specific geometry. By constant height NC-AFM imaging with an O-terminated Cu tip we achieve both sub-molecular resolution and chemical identification within the oxide reconstruction allowing a precise adsorption site determination. Supported by DFT calculations the adsorption behavior adjacent to the Cu(110)-(2x1)O reconstruction is compared to the adsorption on the Cu(110) surface, providing a conclusive picture of the fine interplay between the involved lateral and vertical interaction.