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O: Fachverband Oberflächenphysik

O 22: Poster Session - 2D Materials Beyond Graphene: Growth, Structure and Substrate Interaction

O 22.2: Poster

Montag, 16. März 2020, 18:15–20:00, P1A

Selective Oxygen Functionalization of the h-BN/Rh(111) Nanomesh — •Marie Freiberger, Florian Späth, Fabian Düll, Philipp Bachmann, Johann Steinhauer, Hans-Peter Steinrück, and Christian Papp — FAU, Erlangen, Germany

2D materials such as hexagonal boron nitride (h-BN) and graphene are interesting due to their electronic properties, as inert template structures or as possible hydrogen storage materials. As a structural graphene analogue, h-BN features a honeycomb structure. The morphology of a supported h-BN layer strongly depends on the underlying crystal surface. In the case of Rh(111), a Moiré pattern evolves, also known as nanomesh, showing pore and wire regions. This strong corrugation makes h-BN/Rh(111), for example, a suitable template for confined metal nanocluster growth. Further modification of h-BN can be achieved via oxygenation or hydrogenation. In the case of the h-BN nanomesh on Rh(111), this is interesting since the pores and wires may show different reactivity towards functionalization.

Herein, we present detailed studies on the adsorption of molecular oxygen on the h-BN nanomesh on Rh(111). The system is investigated in a model approach under ultra-high vacuum conditions. Using synchrotron radiation-based in situ high-resolution X-ray photoelectron spectroscopy (HR-XPS) we are able to provide a deep insight in this system regarding the adsorption behaviour and thermal stability. Oxygenation is performed via a supersonic molecular beam and is found to occur selectively in the pores of h-BN. The adsorbed oxygen species is stable up to 600 K.