Regensburg 2025 – scientific programme
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O: Fachverband Oberflächenphysik
O 8: Focus Session Molecular Nanostructures on Surfaces: On-Surface Synthesis and Single-Molecule Manipulation I
O 8.6: Talk
Monday, March 17, 2025, 12:00–12:15, H24
Tuning the properties of 2D Metal-Organic Frameworks by doping of the support — •Ayesha Jabeen1, Zdeněk Jakub1, Dominik Hrůza1, Lenka Černá1, Pavel Procházka1, Jakub Planer1, and Jan Čechal1,2 — 1CEITEC-Central European Institute of Technology, Brno University of Technology, Purkyňova 123, Brno 61200, Czech Republic — 2Institute of Physical Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, Brno 61200,Czech Republic
2D metal-organic frameworks (MOFs) are extensively studied due to their tailorable properties, which make them promising for applications in catalysis, energy storage and sensing. Here, we show how the properties of 2D MOFs can be further tuned by varying the energy-level alignment with the supporting surface. We demonstrate this on the case of Ni-TCNQ 2D MOF, that we synthesized atop graphene/Ir(111) with different doping levels. The graphene doping is achieved by intercalation of heteroatoms at the graphene/Ir(111) interface; namely oxygen (for p-doping) and dysprosium (for n-doping). The changes in the support*s Fermi level position are clearly identified by photoemission techniques (XPS/UPS/ARPES). The Ni-TCNQ 2D MOFs supported on differently doped graphene show distinct properties, as evidenced by STM, XPS and LEEM/LEED. Most notably, XPS suggests that the charge state of the embedded Ni atoms can be controlled, as we observe two distinct components of Ni core levels, whose ratio depends on the support′s doping level. These findings highlight the potential of support doping for tailoring the properties of designer 2D MOFs.
Keywords: 2D Metal-Organic Frameworks; Doping; Fermi Level; X-ray Photoemission Spectroscopy; Low Energy Electron Microscopy