Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: 2D Materials I: Electronic Structure, Excitations, etc. (joint session O/CPP/HL)

CPP 17.11: Vortrag

Montag, 16. März 2020, 13:15–13:30, WIL C107

Neutralization of ions transmitted through graphene and MoS2 monolayers — •Sascha Creutzburg1,7, Janine Schwestka2, Anna Niggas2, Heena Inani3, Anthony George4, Lukas Madauß5, Stefan Facsko1, Jani Kotakoski3, Marika Schleberger5, Andrey Turchanin4, Pedro L. Grande6, Friedrich Aumayr2, and Richard A. Wilhelm1,21HZDR, Ion Beam Center, Dresden, Germany — 2TU Wien, Institute of Applied Physics, Vienna, Austria — 3University Vienna, Faculty of Physics, Vienna, Austria — 4Friedrich Schiller University Jena, Institute of Physical Chemistry, Germany — 5University Duisburg-Essen, Faculty of Physics and CENIDE, Germany — 6Federal University of Rio Grande do Sul, Porto Alegre, Brazil — 7TU Dresden, Germany

Ion irradiation is a widely used technique for material modification. The use of ion irradiation for defect engineering in 2D materials requires a high sensitivity of energy deposition in the surface during the ion’s impact. Ions of high charge states (e.g. Xe30+) deposit their potential energy of up to tens of keV in shallow surface depths triggering nanostructure formation. In fact, nanostructure formation in 2D materials, like carbon nanomembranes or MoS2, due to the impact of Xe ions of charge states larger than 28 was observed. In contrast, no nanostructures on graphene were found, even after irradiation with Xe40+ ions. Here, we investigated the ion’s neutralization during the transmission through freestanding graphene and MoS2 monolayers. We deduce the lost energy of the ions (kinetic and potential) in experiment and put our results into context of nanostructuring.

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