Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 14: Organic-inorganic hybrid systems and organic films II

O 14.5: Vortrag

Montag, 12. März 2018, 16:15–16:30, MA 042

Investigation of Caffeine Monolayer Formation on Au(111) — •Malte Schulte, Adam Budde, Ismail Baltaci, Peter Roese, and Carsten Westphal — Experimentelle Physik 1, TU Dortmund, Otto-Hahn-Straße 4a, 44227 Dortmund, Germany

Research on self-assembled molecules on metal surfaces has attracted strong interest in the last few years. Additionally, different phases and polymorph behavior of molecules is in the focus especially for pharmaceutical studies. Caffeine is a psychoactive drug and solid caffeine molecules show polymorph behavior with a stable β and a metastable high-temperature α phase. In order to study these aspects from a bottom-up approach we deposited caffeine molecules on an Au(111) surface under ultra-high vacuum conditions. We investigated monolayer self-assembly of caffeine molecules on the surface with scanning tunneling microscopy (STM) and low energy electron diffraction (LEED) and observed different orientations of the caffeine molecules on the substrate.