Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Poster Monday: Organic Molecules on Inorganic Surfaces
O 19.4: Poster
Montag, 1. April 2019, 17:45–20:00, Poster F
Investigation of Self-Assembend Caffeine Monolayer Formation on Au(111) — •Malte Schulte1,2, Ismail Baltaci1,2, Peter Roese1,2, and Carsten Westphal1,2 — 1Experimentelle Physik I, TU Dortmund, Otto-Hahn-Str. 4a, 44227 Dortmund, Germany — 2DELTA, TU Dortmund, Maria-Goeppert-Mayer-Str. 2, 44227 Dortmund, Germany
In recent years the molecule caffeine gained particular interest due to its importance in pharmaceutical applications. The bioavailability of particular substances can be tuned by their structure. Furthermore, in bulk crystals caffeine shows a polymorph behavior with a stable β- and a metastable high-temperature α-phase. Moreover, an analysis of substrate induced caffeine crystalline growth on different substrates was done recently. Therefore an investigation of caffeine monolayer growth can reveal insides of the crystallite growth and gives details about different phases.
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. To investigate the monolayer self-assembly of caffeine molecules on this surface we performed Scanning Tunneling Microscopy (STM), Low Energy Electron Diffraction (LEED) and X-ray Photoelectron Spectroscopy (XPS). Our results demonstrate successful caffeine monolayer formation, including an molecular alignment in two different directions the Au(111) surface.