Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 13: Organic Molecules on Inorganic Substrates: Adsorption and Growth
O 13.2: Vortrag
Montag, 17. März 2025, 15:15–15:30, H8
Small atoms – large influence: Structural evolution upon dehydrogenation — •Jonas Brandhoff1, Alina Preibsch1, Richard Berger2, Felix Otto1, Roman Forker1, Oliver T. Hofmann2, and Torsten Fritz1 — 1Institute of Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 5, 07743 Jena, Germany — 2Institute of Solid State Physics, Technical University Graz, Petersgasse 16, 8010 Graz, Austria
Molecular self-assembly is governed by the delicate balance between molecule-substrate and intermolecular interactions. Surface reactions can modulate this balance, enabling the engineering of tailored molecular architectures. Dehydrogenation is one of such surface reactions. Despite hydrogen being often overlooked as the smallest atom, its removal can significantly alter molecular interactions. In this study, 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) serves as a prototypical molecule to investigate dehydrogenation processes on surfaces. HHTP contains six equivalent hydroxy groups, allowing for varying degrees of dehydrogenation. These can be controlled via variation of the substrate temperature during deposition or using annealing steps post-deposition. Utilizing distortion-corrected Low-Energy Electron Diffraction (LEED), Scanning Tunneling Microscopy (STM), and Density Functional Theory (DFT), we examine the structural properties of (dehydrogenated) HHTP monolayers on Cu(111). Our analysis reveals distinct HHTP motifs and elucidates their interactions, providing deeper insights into the design of molecular architectures through controlled surface chemistry.
Keywords: Dehydrogenation; LEED; STM; DFT