Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 8: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation I
O 8.5: Vortrag
Montag, 17. März 2025, 11:45–12:00, H24
Stability and Reactivity of Fe-DCA 2D Metal-Organic Framework on Graphene — •Zdeněk Jakub1, Dominik Hrůza1, Taduáš Lesovský1, Ayesha Jabeen1, Jakub Planer1, Pavel Procházka1, and Jan Čechal1,2 — 1CEITEC - Central European Institute of Technology, Brno University of Technology, Purkyňova 123, Brno 61200, Czechia — 2Institute of Physical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, Brno 61200, Czechia
2D Metal-Organic Frameworks (2D MOFs) are promising materials for applications in catalysis, sensing or spintronics. 2D MOFs based on 9,10-dicyanoanthracene (DCA) linker molecules are particularly intriguing due to their recently demonstrated magnetic and topological properties. Here, we study the reactivity of Fe-DCA supported on a weakly-interacting substrate, graphene/Ir(111). Using Scanning Tunneling Microscopy (STM), X-Ray Photoemission Spectroscopy (XPS) and Low-Energy Electron Microscopy/Diffraction (LEEM/LEED) we test how the Fe-DCA responds to exposure to CO, O2, and thermal annealing. Our data indicate that CO readily adsorbs at room temperature, and the 2D MOF remains stable. In contrast, adsorption of O2 causes structural collapse of the 2D MOF, leaching the Fe cations from the Fe-DCA islands and leaving patches of self-assembled DCA on the surface. Thermally, the Fe-DCA structure decomposes upon annealing above 100 ∘C. Overall, our work addresses the limits of thermal and chemical stability of metal-DCA systems; such knowledge is relevant for any potential application of these materials.
Keywords: 2D Metal-Organic Frameworks; Reactivity; Adsorption; Scanning Tunneling Microscopy; X-Ray Photoemission Spectroscopy