Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Poster Monday: 2D Materials 1

O 18.27: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Adsorption and Reaction of Bromine on h-BN/Rh(111) — •Eva Marie Freiberger, Natalie J. Waleska, Felix Hemauer, Valentin Schwaab, Hans-Peter Steinrück, and Christian Papp — Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

Due to their unique chemical and electronic properties, rendering them promising for many applications, numerous two-dimensional materials (2DM) have been predicted, synthesized and characterized. To tailor the properties of 2DM towards possible applications, their chemical modification is of special interest. Hexagonal boron nitride (h-BN), a graphene analogue, exhibits a so-called nanomesh on Rh(111), which can be used as a template enabling spatially defined modification of the 2DM. Using this template, we aim for selective functionalization of h-BN/Rh(111) with halogens, which lead to strong electronic doping. Here, we present a synchrotron radiation-based high-resolution X-ray photoelectron spectroscopy (XPS) study on the adsorption and thermally induced reaction of bromine on h-BN/Rh(111). The adsorption of different amounts of bromine was followed in situ at 170 K, confirming the template effect of the nanomesh for low coverages. Based on temperature-programmed XPS (TPXPS) experiments, we propose covalent functionalization of the pores and a thermally induced on-surface reaction of bromine. Furthermore, the adsorption is observed to be reversible upon heating to 800 K. By shedding light on their controlled chemical modification on the molecular scale, our work paves the way for purposeful tailoring of the properties of 2DM.