Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 8: Metal Substrates I: Adsorption and Reactivity

O 8.9: Hauptvortrag

Montag, 1. April 2019, 12:30–13:00, H25

Deposition and properties of ultrathin films of organic radicals — •Maria Benedetta Casu — Institute of Physical and Theoretical Chemistry, University of Tübingen, Germany

In this work, we demonstrate that it is possible to evaporate and deposit organic radicals onto well-defined surfaces under controlled conditions, without degradation. Using soft X-ray spectroscopies, we investigate thin film processes, surfaces, and interfaces at the nanoscale of organic radicals deposited on metal and metal oxide surfaces. We find that organic radicals are physisorbed and keep their magnetic moment on inert and passivated surfaces, while defective sites such as oxygen vacancies or presence of OH groups lead to chemisorption of the organic radicals on the surface with quenching of their magnetic moment. Our work shows that the use of X-ray based techniques represents a powerful approach to reveal the mechanisms governing complex interfaces, such as radical/metal and radical/metal-oxide where it is important to describe both charge and spin behavior (spinterfaces). A deep understanding of stable radical/inorganic spinterfaces may open the way to use radicals in solid state devices, or as quantum bits with dedicated configurations, as proposed for other molecular quantum bits, and in spin-based electronics.