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O: Fachverband Oberflächenphysik

O 66: Poster Session V: 2D Materials: Electronic structure, excitations, etc. I

O 66.1: Poster

Wednesday, March 3, 2021, 10:30–12:30, P

Selective Oxygen Functionalization of the h-BN/Rh(111) Nanomesh — •Eva Marie Freiberger, Florian Späth, Fabian Düll, Hans-Peter Steinrück, and Christian Papp — Friedrich-Alexander-Universität, Erlangen, Germany

2D materials such as the graphene analogue hexagonal boron nitride (h-BN) are interesting due to their unique structural, chemical and electronic properties. The morphology of a supported h-BN layer strongly depends on the underlying crystal surface. In the case of Rh(111) as substrate, a Moiré with pore and wire regions evolves, also known as nanomesh. Chemical modification, e.g. covalent functionalization with hydrogen and oxygen, of Ni(111) supported h-BN has already been reported. In the case of the h-BN nanomesh on Rh(111), such functionalization is especially interesting since the pores and wires may show different reactivity towards functionalization enabling spatially defined modification of h-BN.

Herein, we present detailed studies on the adsorption of molecular oxygen on the h-BN nanomesh on Rh(111). Using synchrotron radiation-based in situ high-resolution X-ray photoelectron spectroscopy we are able to provide a deep insight in this system regarding the adsorption behavior and the thermal stability of the covalent functionalization. Oxygen functionalization is performed via a supersonic molecular beam and is found to be an activated process occurring selectively in the pores of h-BN. The adsorbed oxygen is proposed to bind molecularly to two boron atoms in the pores of the Moiré. It is stable up to about 650 K.