Regensburg 2016 – scientific programme

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O: Fachverband Oberflächenphysik

O 43: Oxides and Insulators: Adsorption I

O 43.8: Talk

Tuesday, March 8, 2016, 15:45–16:00, H6

Electrospray deposition of organic molecules in UHV on bulk insulator surfaces — •Antoine Hinaut, Rémy Pawlak, Thilo Glatzel, and Ernst Meyer — Department of Physic, University of Basel Klingelbergstrasse 82, CH-4056 Basel, Switzerland

Adsorption of molecules, isolated or as assemblies, on surfaces under ultra high vacuum (UHV) conditions is an important field in nanoscience and lead to many applications such as photovoltaic, molecular electronic or surface functionalization. To study larger and more complex molecules in such conditions, suitable for such devices an alternative method to thermal evaporation is to use Electrospray ionisation system. In that way, the deposition of molecules contained in solution on atomically-clean surfaces is not limited to their size or their reactivity.

In our measurement we imaged, by bimodal non-contact atomic force microscopy (ncAFM), adsorbed molecules that were deposited on the bulk insulator surface KBr(001) via electrospray deposition. The molecule is a triply fused diporphyrin, which includes two zinc atoms and two di-cyanophenyl groups for a better anchoring on the KBr(001) surface. For large coverage we found charging of the surface due to the deposition. Comparison of the surface before and after the charge compensation will be presented. For lower coverage no charging effects were observed and single molecules have been imaged.