Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 56: Poster Wednesday: Nanostructures 2

O 56.6: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P4

3d-Nanoparticles on Graphene: Influence of Temperature — •Kai Besocke, Mahboobeh Ravankhah, and Mathias Getzlaff — Institut für Angewandte Physik, Heinrich-Heine-Universität Düsseldorf

With its unique properties, such as high quality crystal structure, excellent electrical conductivity and high tensile strength, graphene is a promising substrate for fabricating nanocomposites. In this context we are investigating the influence of graphene as substrate for the deposition of metallic nanoparticles and the influence of susequent heating. In this contribution we present our results concerning the mobility and distribution of Fe_0.5Ni_0.5-Nanoparticles on graphene surfaces.

A W(110) single crystal serves as the substrate being coated with a Co thin film of about 20 ML and annealed at temperatures up to 500 ^∘C. Surfaces prepared in such a way exhibit elongated Co-islands with a width of several hundred nm and height up to 10 nm, which are coated with graphene subsequently. For graphene synthesis the samples are heated in a Propene atmosphere of 10⁻⁶ mbar for several minutes. The nanoparticles are produced by means of Ar magnetron sputtering in a Haberland source and aggregation takes place in a He atmosphere. The spherical particles under investigation have diameters of several nm. Particle distributions are analyzed via STM, both as-prepared as well as after heating. It will be discussed, whether the nanoparticles are more mobile on graphene compared to other surfaces.