Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Nanostructures at surfaces:1D, 2D, networks – Poster
O 69.1: Poster
Wednesday, March 11, 2026, 18:00–20:00, P2
Study of different structural phases of Ni-DCA networks on graphene/Ir(111) — •Ayesha Jabeen1, Dominik Hrůza1, Zdeněk Jakub1, Jakub Planer1, Anna Kurowska1, Pavel Procházka1, and Jan Čechal1,2 — 1CEITEC - Central European Institute of Technology, Brno University of Technology, Czech Republic — 2Faculty of Mechanical Engineering, Brno University of Technology, Czech Republic
2D metal-organic frameworks (MOFs) represent a promising class of two-dimensional nanomaterials with tunable electronic and magnetic properties, which could have potential applications in catalysis and spintronics. In this study, we investigate the structural phases and thermal stability of Ni-DCA (9,10-dicyanoanthracene) networks supported on graphene/Ir(111). Employing Low-Energy Electron Microscopy (LEEM), Scanning Tunnelling Microscopy (STM), and X-ray Photoemission Spectroscopy (XPS), we identified three distinct structural phases: two phases composed of isolated Ni1(DCA)3 coordination complexes coexisting with hydrogen-bonded DCA molecules, and one extended metal-organic framework with Ni2(DCA)3 stoichiometry. Despite their different long-range order, all three phases have the same local Ni coordination environment. Thermal annealing reveals that the Ni2(DCA)3 network is the least stable of the three, dissociating into the individual complex phases upon mild annealing around 80 ∘C. These findings elucidate the polymorphic nature and thermal limitations of Ni-DCA networks supported on graphene/Ir(111), contributing to the understanding of DCA-based MOFs.
Keywords: 2D Metal-Organic Frameworks; Strucutral phases; Thermal stability; Stoichiometry; Coordination environment