Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 49: Oxide Surfaces 1

O 49.5: Vortrag

Mittwoch, 7. September 2022, 16:00–16:15, S053

Adsorption and structural behaviour of thymine on Ce2O3 and Ce6WO12 — •Sascha Mehl — Elettra Sincrotrone, Trieste, Italy

Reducible oxides are of particular interest in the field of biological systems and nanotechnology application for instance in biosensors, bio medicine and catalysis. The aim is to design novel nano-size structured thin cerium oxide films that possess bio recognition and bio catalytic properties to detect macro molecules e.g. nucleic acids. Model studies of simplified systems such as nucleobases on well-defined oxide surfaces play a major role for understanding and development of these highly promising bio analytical devices. We utilized synchrotron radiation photo electron spectroscopy (SRPES), resonant photo electron spectroscopy (RPES) and X-ray absorption spectroscopy (XAS) which provide ideal conditions to obtain oxidation states, structural and geometrical information on thin organic ad layers. Furthermore, the focus was on the adsorption behavior, electronic structure and thermal stability in the temperature range of 25 * 250 °C of thymine on reduced cerium oxide model systems: thymine/Ce2O3(111)/Cu(111) and thymine/Ce6WO12(100)/W(110). We distinguished two different adsorbed species of thymine on cerium oxide: one strongly bound chemisorbed type and a second weakly bound physisorbed species in the multi layer regime which desorbs at 75 °C. Further investigations have shown that chemisorbed thymine binds to the surface via N-atoms independent of elementary composition and stoichiometry of the substrate.