Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 46: Poster Organic Molecules on Inorganic Substrates: Electronic, Optical and Other Properties
O 46.7: Poster
Dienstag, 18. März 2025, 18:00–20:00, P2
Thermal-Driven Coordination Effect for Structural and Electronic Tailoring of a Metal-Organic Network — •Jonas Gödde1, Lu Lyu1,2, Benjamin Stadtmüller2, and Martin Aeschlimann1 — 1Department of Physics and Research Center OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, Erwin-Schrödinger-Straße 46, 67663 Kaiserslautern, Germany — 2Experimentalphysik II, Institute of Physics, Augsburg University, Universitätsstraße 2, 86159 Augsburg, Germany
Two-dimensional metal-organic porous networks (2D-MOPNs) have emerged as a unique material platform for designing structural tessellations and emergent electronic states on surfaces. The metal centre in a 2D-MOPN plays a vital role in bridging network and substrate. In this study, we investigate the cobalt-coordination effects in cyano-functionalized hexaaza-triphenylene-hexacarbonitrile (HATCN) on Ag(111). Scanning tunnelling microscopy (STM) reveals that HATCN self-assembles into a well-ordered porous network. A partially occupied LUMO state observed by angle-resolved photoemission spectroscopy (ARPES), indicates charge transfer from the substrate to the molecules. After cobalt deposition, the robust equilibrium, between intermolecular and substrate interactions, preserves the porous structure and molecular orbital states of HATCN, while trapping cobalt in the low-potential pores. Upon post-annealing the molecules coordinate with cobalt atoms, inducing a structural transition and creating distinct energy and momentum states. These results provide insights into tailoring 2D-MOPNs for applications in electronics and spintronics.
Keywords: Two-dimensional metal-organic porous networks; Thermal-driven; Scanning tunneling microscopy; Angle-resolved photoemission spectroscopy