Selective Intercalation – A HR-XPS study of graphene-supported FePt clusters on Rh(111) Natalie J. Waleska, Eva Marie Freiberger, Felix Hemauer, Valentin Schwaab and Christian Papp Friedrich-Alexander-Universität Erlangen-Nürnberg, Lehrstuhl für Physikalische Chemie II, Germany Besides the utilization of graphene as a template to obtain ordered nanocluster arrays, also the intercalation of materials underneath the 2D material is in the focus of various works. Especially intercalated magnetic materials are of interest, as they could induce magnetic properties in the graphene layer itself. [1] In this work, we investigated graphene-supported FePt clusters on the Rh(111) single crystal surface by in situ high-resolution XPS and the utilization of CO as a probe molecule. The FePt clusters were prepared by successively depositing Fe and Pt on the graphene/Rh(111) substrate. Thus, the as-prepared nanoclusters were more precisely Fe clusters (1.27ML) covered with Pt (0.14ML). Heating of the FePt/graphene/Rh(111) sample to 550K results in restructuring of the nanoclusters by diffusion of the Pt atoms into the bulk of the clusters, as well as cluster ripening. Further increase of the temperature to 750K leads to the selective intercalation of Fe, while Pt remains on top of the graphene layer. This was confirmed by a CO adsorption experiment, which showed that CO was merely adsorbed on Pt, but no CO adsorption was observed on Fe as it is covered by the graphene layer. We thank Helmholtz-Zentrum Berlin for allocation of synchrotron-radiation beamtime and BESSY II staff for support during beamtime. This work was funded by the DFG within SFB 953 ”Synthetic Carbon Allotropes” (Project #182849149). References 1. M. Weser, Y. Rehder, K. Horn, M. Sicot, M. Fonin, A. B. Preobrajenski, E. N. Voloshina, E. Goering, Y. S. Dedkov, Appl. Phys. Lett. 2010 , 96 , 012504.
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