Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 65: Poster: Molecular Nanostructures on Surfaces

O 65.7: Poster

Wednesday, March 20, 2024, 18:00–20:00, Poster C

Electrospray Ionization Ion Beam Deposition of Organic Molecules — •Florian Münster, Lukas Heuplick, Grigori Pasko, Jan Herritsch, and J. Michael Gottfried — Department of Chemistry, University of Marburg, 35043 Marburg, Germany

When studying large molecules on surfaces, the deposition process can often be a limiting factor. While small molecules can usually be thermally evaporated using a Knudsen cell, the vapor deposition of larger molecules may be hindered by their low vapor pressure, especially if the molecules have labile functional groups. One approach to overcome these preparation-related limitations is electrospray ionization ion beam deposition (ESI-IBD). While this technique is becoming increasingly popular, for example in the preparation of large biomolecules, the precise chemical state of the deposited molecules is often unknown. For this study, we chose meso-tetraphenylporphyrin as a well-known model system to investigate the chemical state of the molecule after deposition via ESI-IBD. X-ray photoelectron spectroscopy (XPS) indicates the presence of an N-protonated species. By utilizing scanning tunneling microscopy (STM), we observed self-assembled islands composed of multiple distinguishable species, in agreement with the existence of N-protonated porphyrin molecules.

Keywords: electrospray ionization; ion beam deposition; XPS; STM; porphyrin