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O: Fachverband Oberflächenphysik
O 16: Nanoscale Heterogeneous Catalysis
O 16.6: Vortrag
Montag, 16. März 2020, 16:30–16:45, TRE Ma
Cluster superlattice membranes — Tobias Hartl1, •Moritz Will1, Sophia Dellmann1, Davor Čapeta2, Virgínia Boix de la Cruz3, Rajendra Singh4, Daniel Scheinecker4, Paolo Lacovig5, Silvano Lizzit5, Jani Kotakoski4, Marko Kralj2, Jan Knudsen3, Thomas Michely1, and Pantelis Bampoulis1 — 1II. Physikalisches Institut, University of Cologne — 2Institut za fiziku, Zagreb — 3MAX-IV Lab, Lund — 4Faculty of Physics, University of Vienna — 5ELETTRA Sincrotrone, Trieste
We demonstrate the fabrication of a free-standing material consisting of a dense array of perfectly ordered and similar-sized metal nanoclusters sandwiched between sp2/sp3-hybridized carbon and graphene, highly stable under reaction conditions. The nanometer-thick membrane is prepared by conformal embedding of pre-formed Ir cluster arrays on graphene/Ir(111) with elemental carbon in ultra-high vacuum and subsequent ex situ transfer from the Ir(111) crystal by the hydrogen bubbling method. High resolution transmission electron microscopy of the free-standing membrane confirms the perfect order and crystallinity of the encapsulated metal clusters, with super-lattice constant of 2.51nm and Ir nearest-neighbor distance of 2.5A. The approach presented in this study can be extended to different cluster materials and sizes. It paves the way for synthesizing cluster membranes with tunable functionalities which have potential applications in optoelectroncis, nanomagnetism and catalysis.