SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 41: Poster: Supported Nanoclusters
O 41.2: Poster
Dienstag, 28. März 2023, 18:00–20:00, P2/EG
Beyond Amorphous Carbon as an Embedding Material for Cluster Superlattice Membranes — •Stefan Schulte1,2, Tobias Hartl1, Alexei Preobrajenski3, Jan Knudsen3, and Thomas Michely1 — 1II. Physikalisches Institut, Universität zu Köln, Germany — 2Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany — 3MAX IV Laboratory, Lund University, Sweden
Cluster super lattice membranes constitute a novel 2D template material that has recently been described (T. Hartl et al., ACS Nano, 2020). So far, metal nano clusters on a graphene or hexagonal boron nitride support were embedded in an amorphous C matrix. This provides mechanical and thermal stability to the clusters, but a non-conductive embedding material, that allows for selective removal of the support structure is sought after. Here, embedding of cluster superlattices in B is presented and embedded clusters are characterized by STM and XPS. Embedding in B exhibit mechanical and thermal stability similar to amorphous C, e.g., Ir clusters on a graphene support embedded by a few monolayers of B remain in excellent order up to 750 K. This opens the pathway to electronic characterization of the nano clusters as well as removal of the support layer to expose stable clusters to ambient conditions. Further, preliminary results on CeO2 embedding will be presented. CeO2 embedded metal clusters are a promising material in few-atom catalysis processes.