Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Organic Molecules at Surfaces 4: Chemistry on Surfaces
O 40.4: Vortrag
Mittwoch, 7. September 2022, 11:15–11:30, S051
Remarkably table metal-organic networks on an inert substrate: Ni-, Fe-, and Mn-TCNQ on graphene — •Zdeněk Jakub1, Anna Kurowská1, Ondrej Herich1, Lenka Černá1, Lukáš Kormoš1, Azin Shahsavar1, Pavel Procházka1, and Jan Čechal1,2 — 1CEITEC, Brno University of Technology, Czechia — 2Faculty of Mechanical Engineering, Brno University of Technology, Czechia
Potential applications of 2D metal-organic frameworks (MOF) require the frameworks to be monophase and well-defined at the atomic scale, to be decoupled from the supporting substrate, and to remain stable at the application conditions. Here, we present three systems meeting this elusive set of requirements: M-TCNQ (M = Ni, Fe, Mn) on epitaxial graphene/Ir(111). We study the systems experimentally by scanning tunneling microscopy, low energy electron microscopy and x-ray photoelectron spectroscopy. When synthesized on graphene, the 2D M-TCNQ MOFs are monophase with M1(TCNQ)1 stoichiometry, and we demonstrate their remarkable chemical and thermal stability: All the studied systems survive exposure to ambient conditions, with Ni-TCNQ doing so without any significant changes to its atomic-scale structure or chemical state. Thermally, the most stable system is Fe-TCNQ which remains stable above 500 ∘C, while all the tested MOFs survive heating to 250 ∘C. Overall, the modular M-TCNQ/graphene system combines the atomic-scale definition required for fundamental studies with the robustness needed for applications, thus it presents an ideal model for research in single atom catalysis or spintronics.