Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 85: Poster Session - Supported Nanoclusters: Structure, Reactions, Catalysis
O 85.1: Poster
Wednesday, March 18, 2020, 18:15–20:00, P2/EG
Bottom-up synthesis of free-standing nanocluster arrays supported by carbon — •Tobias Hartl1, Moritz Will1, Sophia Dellmann1, Davor Čapeta2, Virginia Boix de la Cruz3, Rajendra Singh4, Daniel Scheinecker4, Paolo Lacovig5, Silvano Lizzit5, Jani Kotakoski4, Jan Knudsen3, Marko Kralj2, Thomas Michely1, and Pantelis Bampoulis1 — 1University of Cologne — 2Institute of Physics, Zagreb — 3MAX IV Laboratory, Lund — 4University of Vienna — 5Elettra Synchroton, Trieste
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, high temperature. We succeeded in synthesizing free-standing membranes hosting metal cluster superlattices which are stable at these conditions. We present, in detail, the fabrication process of such membranes. The cluster superlattices are grown on graphene on Ir(111), and subsequently embedded in a few nanometer thick carbon matrix. XPS and STM reveal that the carbon embedding is conformal to the clusters, anchors them to the graphene and greatly improves their thermal and mechanical stability. Removal of the membranes from the Ir(111) substrate by hydrogen bubbling is possible, when a substantial reduction of the graphene-Ir binding is accomplished by annealing at 850 K and intercalation of Eu. Post-removal TEM analysis of the cluster lattice membrane proves that the excellent order of the cluster lattice is maintained in the free-standing membrane.