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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 82: Fundamentals of Catalysis II

O 82.2: Vortrag

Donnerstag, 4. April 2019, 15:15–15:30, H5

Graphene-coating of Platinum nanoparticles — •Martha Scheffler, Georgios Pantazidis, and Liv Hornekaer — Department of Physics and Astronomy, Aarhus University, Denmark

Despite the great potential that has been reported for core-shell metal-metal nanoparticles in catalytic processes and biomedical applications, similar reports on graphene-coated nanoparticles are lacking. Graphene coatings prevent nanoparticles from sintering, increase the temperature stability, and can prevent corrosive species from blocking the catalytically active sites. For some single crystal systems, graphene coatings have been shown to have beneficial effects, improving reaction efficiency.

We will present our measurements on graphene-coated Platinum nanoparticles. We synthesized Pt nanoparticles of tens of nm in diameter under UHV conditions using an HOPG support. Via chemical vapor deposition using ethylene, we produced a graphene coating on these nanoparticles that is tested on its catalytic and reactive properties. We use scanning tunneling microscopy to describe the shape and size of the nanoparticles as well as the topography of the graphene layer.

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