Dresden 2017 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 41: Nanostructures at Surfaces: Metals, Oxides and Semiconductors II
O 41.5: Vortrag
Dienstag, 21. März 2017, 15:00–15:15, REC/PHY C213
Size dependent changes in the electronic structure of manganese oxide nanoparticles and clusters probed by soft X-ray absorption and emission spectroscopy — •Marc F. Tesch1, Maryam N. Shaker1,2, Daniela Schön1,2, Niklas Cibura3, Emad F. Aziz1,2, and Jennifer Strunk3 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin — 2Fachbereich Physik, Freie Universität Berlin, 14195 Berlin — 3MPI für chemische Energiekonversion, 45413 MÜLHEIM an der Ruhr
Nanoscale objects are of tremendous interest for novel applications since they can exhibit significant changes in their material properties compared to the bulk material. This is interesting for catalytic applications because the quantum size effect, causing a bandgap widening, can facilitate photocatalytic reactions. We present a study on MnOx nanoparticles, which are promising candidates to act as environmental friendly water oxidation catalysts. Nanoparticles of different sizes were obtained by pulsed laser ablation and nanoclusters were produced in a self-arrangement process from solution with grafting and impregnation techniques on mesoporous silica. The samples are studied by means of soft X-ray absorption spectroscopy and resonant inelastic X-ray scattering at the Mn L-edges. The combination of these techniques allows tracking changes in the electronic structure of the unoccupied as well as of the occupied 3d valence states. The two sample systems are compared with respected to each other and to spectra of bulk references and an overview of the particle size dependence on the catalytic activity and the electronic structure will be given.