Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster Tuesday: Nanostructures
O 41.9: Poster
Dienstag, 2. April 2019, 18:00–20:00, Poster D
Sandwich-molecular wires: Combining cyclooctatetraene with rare- and alkaline-earth metals on Gr/Ir(111) — •Stefan Kraus1, Ken Bischof1, Felix Huttmann1, Alexander Herman2, Nico Rothenbach2, Katharina Ollefs2, Nicolae Atodiresei3, Heiko Wende2, and Thomas Michely1 — 1Universität zu Köln, Germany — 2Universität Duisburg-Essen, Germany — 3Forschungszentrum Jülich, Germany
We investigate the growth of sandwich-molecular wires, one-dimensional arrangements of alternating organic molecules and metal atoms. Here, we combine cyclooctatetraene (Cot, C8H8) with rare- and alkaline-earth metals in an on-surface synthesis on the inert substrate graphene/iridium(111). Recently, such wires were grown using europium (Eu), yielding crystalline islands of interlocked wires with intra-/interwire distances of 4.4Å/6.8Å. Based on the favored 2- oxidation state of Cot in this compound, we explore whether the same synthesis principle holds also for other metals releasing 2e− to Cot. From the rare-earth elements we test ytterbium (Yb) and from the alkaline-earth elements barium (Ba), both favoring oxidation state 2+ in this compound. In fact, for both cases wire formation in islands is observed, with intra-/interwire distances of 4.1Å/6.4Å for Yb and 4.8Å/6.8Å for Ba which are in agreement with the slightly smaller/larger atomic radius of Yb/Ba compared to Eu. Furthermore, we accomplished to grow alloy wire islands by co-depositing Eu and Yb during synthesis.