DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2024 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

O 29: Poster: 2D Materials

O 29.2: Poster

Tuesday, March 19, 2024, 12:30–14:30, Poster A

h-BN in the Making: The Surface Chemistry of Borazine on Rh(111) — •Eva Marie Freiberger1, Fabian Düll1, Phiona Bachmann1, Johann Steinhauer1, Hans-Peter Steinrück1, and Christian Papp1,21FAU Erlangen-Nürnberg, Erlangen, Germany — 2FU Berlin, Berlin, Germany

The intriguing properties of two-dimensional materials (2DM) gave rise to a vivid research field. One of the most-studied representatives of this class is hexagonal boron nitride (h-BN). In ultra-high vacuum (UHV), h-BN can be grown on a metal support via chemical vapor deposition (CVD) using suitable precursors, such as ammonia borane or borazine. h-BN grown on a lattice-mismatched substrate undergoes a buckling, which is, in the case of Rh(111), referred to as nanomesh.

In this UHV study, we investigated the evolution of the h-BN nanomesh from borazine on Rh(111) using synchrotron radiation-based high-resolution X-ray photoelectron spectroscopy (XPS). The adsorption of borazine at 130 K was followed in situ, showing that borazine adsorbs mainly as an intact molecule. By studying borazine on Rh(111) with NEXAFS, we were able to identify a flat-lying adsorption geometry. For a better understanding regarding the formation of h-BN, the thermally-induced reaction of borazine on Rh(111) was investigated by temperature-programmed XPS. We find that borazine multilayers already desorb below 200 K. At 300 K, dehydrogenation of the remaining monolayer occurs, and boron nitride starts to grow in a disordered fashion. Above 600 K, the formation of the nanomesh sets in and, at about 1100 K, the conversion to h-BN is complete.

Keywords: borazine; h-BN; 2D materials; XPS; synchrotron radiation

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2024 > Berlin