SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 3: Metal Substrates: Adsorption and Reaction of Small Molecules I

O 3.7: Vortrag

Montag, 27. März 2023, 12:00–12:15, CHE 91

Self-assembly and dehydrogenation reactions of borazine on Ag(111) — •Tobias Weiss¹, Aleksandr Baklanov¹, Georg S. Michelitsch², Martin Schwarz¹, Manuela Garnica¹, Karsten Reuter³, and Willi Auwärter¹ — ¹Physics Department E20, Technical University of Munich, Germany — ²Laboratoire des Solides Irradiés, École Polytechnique, France — ³Chair of Theoretical Chemistry, Technical University of Munich, Germany

Borazine (B₃N₃H₆), is a prominent precursor for the growth of hexagonal boron nitride (hBN) on metal supports [1]. With monolayer hBN playing an important role in the field of 2D-materials, borazine adsorption, assembly and decomposition on surfaces is a topic of interest. Space-averaging studies revealed flat or tilted adsorption geometries on different substrates depending on their catalytic activity [2,3].

Here, we provide unprecedented real-space insight into adsorbed borazine molecules and their on-surface chemistry in ultra-high vacuum. This scanning tunneling microscopy investigation of the self-assembly of borazine on Ag(111) reveals a highly regular, porous hexagonal phase or a dense packed structure, depending on exposure. Furthermore, tip-induced dehydrogenation reactions of single molecules result in a tilted adsorption geometry. Complementary density functional theory calculations were performed to comprehensively characterize potential reaction products and adsorption configurations.

[1] W. Auwärter, Surf. Sci. Rep., 2019, 74, 1-95

[2] R. Simonson, Surf. Sci., 1991, 254, 29-44

[3] L. Haug, Phys. Chem. Chem. Phys., 2020, 22, 11704