SKM 2023 – scientific programme
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DS: Fachverband Dünne Schichten
DS 4: Thin Film Properties I
DS 4.3: Talk
Monday, March 27, 2023, 16:00–16:15, SCH A 316
Thermally controlling the length of transition and alkali metal squarate wires — •Egzona Isufi Neziri1,2, Karl-Heinz Ernst1,2, and Christian Wäckerlin3,4 — 1Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland — 2University of Zürich, 8006 Zürich, Switzerland — 3Paul Scherrer Institute, 5232 Villigen, Switzerland — 4EPFL, Swiss Federal Institute of Technology Lausanne, 1015 Lausanne, Switzerland
Low-dimensional metal-organic nanomaterials on surfaces can be engineered to yield promising, novel and highly customizable chemical/physical properties such as magnetism, electronic structure and catalytic properties. A variety of metal elements, including alkali, transition and even lanthanide metals have been used to direct the metal-organic assembly.
Here metal-organic structures obtained from squaric acid (H2C4O4) molecules, co-deposited with K and Ni atoms on a hot Au(111) surface, are studied by XPS and STM. We find that both K and Ni lead to the formation of condensed arrays of wires, composed of M-squarate (C4O4(2-)). Controlling the length of these wires is possible by a thermally activated process: Ni-squarate wires tend to get longer at higher temperatures while K-squarate wires get shorter.