SKM 2023 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 29: Supported Nanoclusters: Structure, Reactions and Catalysis
O 29.9: Vortrag
Dienstag, 28. März 2023, 12:30–12:45, CHE 91
Bottom-up synthesis and transfer of free-standing nanocluster arrays supported by carbon — •Tobias Hartl1, Stefan Schulte1, Moritz Will1, Pantelis Bampoulis1,2, Rajendra Singh3, Jani Kotakoski3, Jan Knudsen4, and Thomas Michely1 — 1Universität zu Köln — 2MESA+ Institute for Nanotechnology — 3Universität Wien — 4MAX IV Laboratory
Cluster superlattices exhibit unique properties stemming from their small size and dimensionality. However, their use in applications is hampered by their low stability when exposed to application relevant conditions, e.g. ambient pressure or high temperature. We succeeded in synthesizing free-standing cluster superlattice membranes (CSLM) which are stable at these conditions. CSLMs consist of a 2D lattice of similar-sized nanoclusters sandwiched between graphene (Gr) and an amorphous carbon (a-C) matrix. In order to make the membrane useful for experiments in nanocatalysis, it needs to be lifted off from the Ir(111) substrate and flipped over, to expose it's Gr bottom side. This enables the removal of the covering Gr sheet and provides access to the clusters in the a-C matrix. Turning the membrane around requires a double transfer process, which is preceded by water and gas intercalation below the membrane. The transfer process consists of a first pick-up with a PDMS stamp, then a second pick-up from the PDMS stamp onto a polycarbonate stamp and finally the transfer to a new substrate. We present the fabrication and transfer processes of the membranes and explore the thermal stability and the physicochemical properties of this novel nanomaterial via XPS, TEM and STM.