Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 48: Poster: 2D Materials beyond Graphene: TMDCs, Silicene and Relatives
O 48.16: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Photoemission electron microscopy study of MXene microflakes — •Bharti Parashar1, Pika Gospodaric1, Kanit Hantanasirisakul2, Slavo Nemsak1, Tomas Duchon3, Johanna Hackl1, Lukasz Plucinski1, Steven May2, Yury Gogotsi2, and Claus M. Schneider1 — 1Peter Grünberg Institut PGI-6, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Drexel University Materials Science & Engineering, 3141 Chestnut Street (LeBow 344), Philadelphia, PA 19104 U.S.A. — 3Department of Surface and Plasma Science, Charles University in Prague, Czech Republic
Recent advances in photoemission electron microscopy (PEEM) facilitate access to electronic structure with sub-100 nm lateral resolution, either through x-ray absorption (XAS) or photoemission (PES) spectroscopy. Utilizing these techniques, we have studied thin chemically exfoliated Ti3C2 MXene microflakes prepared on Si(001) and HOPG substrates. Well-separated single flakes of approx. 5 micrometers in size were characterized with respect to their functionalization with F−, OH−, and O2− groups. The results revealed fluorine-rich clusters of up to 1 micrometer in diameter distributed non-uniformly on the surface of the flakes and we observed their influence on the electronic structure of Ti.
These results provide important complementary information to other, spatially non-resolved techniques, and they are the first steps towards understanding of the electronic band structure of these microscopic objects.