Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 77: Organic Molecules on Inorganic Substrates V: Solid-Liquid Interfaces, Self-Organization, Ordering
O 77.2: Vortrag
Donnerstag, 4. April 2019, 10:45–11:00, H9
Controlling the surface adsorption of polyoxometalates from the liquid phase — •Maria Glöß1,2, Ricarda Pütt1, Marco Moors2, Emmanuel Kentzinger2, Wim Pyckhout-Hintzen2, and Kirill Monakhov3 — 1RWTH Aachen — 2Forschungszentrum Jülich GmbH — 3Leibniz-Institute of Surface Engineering
Vanadium containing polyoxometalates (POMs) offer a wide range of potential applications due to their structural diversity appealing electronic properties. The probability of switching between multiple redox states without structural changes of the molecular system is one of the significant prerequisites for the development of molecule-based data storage devices.
For a technical implementation of POMs it is crucial to elucidate their adsorption behaviour on conductive substrates. In this study we investigate the droplet deposition from the liquid phase in order to correlate the molecular arrangement of POMs in solution and on weakly bonding surfaces.
Therefore, we characterise the adsorption behaviour of a functionalised Wells-Dawson-type POM on HOPG via STM and XPS. For the characterisation of the liquid phase SAXS is used. Depending on the water amount in the POM solution a complex agglomeration mechanism of the molecules is observed, which strongly affects the surface appearance after deposition reaching from defect-rich 2D molecular layers up to the formation of isolated metal-oxo cluster arrangements.