Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Nanostructures at Surfaces: Metals, Oxides and Semiconductors II

O 41.2: Vortrag

Dienstag, 21. März 2017, 14:15–14:30, REC/PHY C213

3d-metal nanoparticles on tungsten, tungsten-oxide and tungsten-carbide — •Hendrik Bettermann, Knuth Scheiff, Jens Schubert, and Mathias Getzlaff — Institute of Applied Physics, Heinrich-Heine-Universität Düsseldorf

Supported clusters and nanoparticles are rather interesting objects not only from a fundamental point of view but also for technological applications due to their electronic and magnetic properties. These properties typically show a strong size dependence. Interaction with the substrate during and after deposition significantly influences the particles' properties.

Our contribution is focused on size-selected nanoparticles made from Fe, Co, and Ni and their binary alloys. These particles are deposited on W(110) as well as the corresponding tungsten-oxide and -carbide superstructures. Two UHV-compatible nanoparticle sources, an Arc Cluster Ion Source (ACIS) and a magnetron sputter source (Haberland-type), can produce a wide range of particle sizes (4 to 15 nm).

Size and structural properties are investigated by STM (scanning tunneling microscopy) and LEED (low energy electron diffraction) under UHV conditions. Samples are tempered to determine the melting behaviour of the nanoparticles.