Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory

O 36.51: Poster

Tuesday, April 1, 2014, 18:30–22:00, P1

Damage in graphene and single layer hexagonal boron nitride due to electronic excitation induced by highly charged ions — •Roland Kozubek, Johannes Hopster, Oliver Ochedowski, and Marika Schleberger — Universität Duisburg-Essen, Duisburg, Deutschland

In this work, we demonstrate that single layers of exfoliated graphene sustain significant damage from irradiation with slow highly charged ions of different charge states (q = 28-42). By atomic force microscopy in lateral force mode we have observed nontopographical frictional defects induced by single ion impacts. To compare these results, we have repeated the experiment with single layers of hexagonal boron nitride (SL-hBN), which is an insulator with a bandgap of 5.5 eV. One can see, that the threshold potential energy for defect creation in graphene is much smaller than in SL-hBN, which can be explained by the classical over-the-barrier model. Here, the time of flight of the ion above the surface is the key parameter, which is varied in further studies by using different projectile velocities. From these experiments we expect to be able to create large defective areas at low kinetic energies. In order to achieve this, a novel deceleration system was installed and tested at our setup.