Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: 2D Materials III: Nanomembranes, hBN, and Particle Interactions
O 59.4: Vortrag
Mittwoch, 3. April 2019, 16:00–16:15, H16
Au-Rh surface alloy for tuning the nanomesh structure of h-BN — •Krisztián Palotás1,2,3, László Óvári3, Gábor Vári3, Richárd Gubó3, Arnold Farkas3, János Kiss3, András Berkó3, and Zoltán Kónya3 — 1Wigner Research Center for Physics, Hungarian Academy of Sciences, Budapest, Hungary — 2Budapest University of Technology and Economics, Budapest, Hungary — 3University of Szeged, Szeged, Hungary
Hexagonal boron nitride (h-BN) monolayer on the Rh(111) substrate has a periodically corrugated "nanomesh" structure. On the other hand, h-BN layer on a clean Au(111) substrate is atomically flat. By forming surface alloys of Au-Rh in different compositions on a Rh(111) substrate, we report on the gradual tunability of the nanomesh morphology of h-BN [1], which can be useful for various nanopatterning applications. Increasing the Au amount in the surface alloy results in reduced pore diameter and corrugation of the h-BN layer [1]. The experimental findings are confirmed by density functional theory calculations: The energetically preferred ordered (2x1) Au-Rh surface alloy [2,3] is reconstructed, and Rh is accummulated below the pore of h-BN.
References: [1] R. Gubó et al., Phys. Chem. Chem. Phys. 20, 15473 (2018). [2] L. Óvári et al., Phys. Chem. Chem. Phys. 18, 25230 (2016). [3] K. Palotás et al., J. Phys. Chem. C 122, 22435 (2018).