Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 33: Nanostructures at Surfaces III

O 33.1: Vortrag

Dienstag, 12. März 2013, 10:30–10:45, H45

Surface modification on ultra-thin sheets of molybdenum disulfide due to irradiation with highly charged ions — Johannes Hopster, •Roland Kozubek, Jakob Krämer, and Marika Schleberger — Universität Duisburg-Essen, Duisburg, Deutschland

This presentation deals with the interaction of highly charged ions with single layer molybdenum disulfide. For this purpose MoS₂ was exfoliated on a (100)-Potassium bromide crystal and afterwards irradiated with xenon ions. Xe³⁵⁺ and Xe⁴⁰⁺ were used while the kinetic part of the energy was kept constant. By means of atomic force microscopy, pits and hillocks could be identified. The creation of hillocks was observed for both charge states and for different thicknesses of the MoS₂ layers, while their height and diameter depend on these aforementioned values. The different illustration of the defects obtained in trace and retrace scan direction in contact mode lead us to believe, that at this positions an enhanced friction exists, while the information of the topography arises from the tapping mode measurements.

The creation of pits could only be observed on single layer MoS₂ after the irradiation with Xe⁴⁰⁺. Because of the fact that the ion induced defects on KBr are quiet similar to the detected ones we deduce that these pits are formed underneath the single layer in the substrate. As a consequence, the MoS₂-Layer at this position could also be damaged and demolished.