Precursor chemistry of h-BN: adsorption, desorption, and decomposition of borazine on Pt(110)

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Abstract

Adsorption, desorption and fragmentation of borazine on Pt(110) are studied by temperature-programmed desorption, ultraviolet photoemission spectroscopy, workfunction measurements and density functional theory. Borazine adsorbs in part dissociatively, forming an upright (B3N3H5˙)ads adsorption complex. Radicals with a N–Pt bond are weakly bound and desorb recombinatively following second-order kinetics. Radicals with a B–Pt bond are similar in binding strength to the molecularly adsorbed species, which binds through dispersive forces to the (111) facets of the (1 × 2) reconstructed Pt(110). Both do not desorb but are dehydrogenated beyond T = 150 K. As T approaches 600 K the B–N ring progressively breaks down into its atomic constituents. The borazine ice multilayer is capable of trapping significant amounts of hydrogen. Previous studies of borazine adsorption on other transition metal surfaces yield a very similar pattern. Reported multiple molecular desorption peaks are artefacts. Implications for the nucleation and growth of h-BN monolayers at high temperatures are discussed.

Citation

Haug, Leander, et al. “Precursor chemistry of h-BN: adsorption, desorption, and decomposition of borazine on Pt (110).” Physical Chemistry Chemical Physics 22.20 (2020): 11704-11712.

@article{haug2020precursor,
  title={Precursor chemistry of h-BN: adsorption, desorption, and decomposition of borazine on Pt (110)},
  author={Haug, Leander and Roth, Jannik P and Thaler, Marco and Steiner, Dominik and Menzel, Alexander and Tosoni, Sergio and Pacchioni, Gianfranco and Bertel, Erminald},
  journal={Physical Chemistry Chemical Physics},
  volume={22},
  number={20},
  pages={11704--11712},
  year={2020},
  publisher={Royal Society of Chemistry},
  doi={10.1039/D0CP00112K}
}