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Ab initio studies of hydrogen and oxygen chemisorptions on the cubic BN(1 1 1) surface
Journal article   Peer reviewed

Ab initio studies of hydrogen and oxygen chemisorptions on the cubic BN(1 1 1) surface

Shuo Wang Yang, Kian Ping Loh and Ping Wu
Surface science, Vol.599(1), pp.128-140
30/12/2005
DOI: https://doi.org/10.1016/j.susc.2005.10.003

Abstract

Ab initio Ab initio calculations Boron nitride c-BN surface Density functional theory DFT calculation Surface absorptions and surface reactions
The chemisorption states of oxygen molecule, atomic oxygen, hydrogen and hydroxyl radicals on B-terminated c-BN(1 1 1)-1 × 1 and 2 × 1 surface structures have been examined using periodic density functional theory calculations. The c-BN(1 1 1) bulk-truncated boron-face is coordinatively unsaturated and show DOS states in the gap region, these states are removed following surface passivation by H and O atoms. The 2 × 1 reconstruction on the BN(1 1 1) face is found to be energetically more favourable by 4.08 eV compared to the 1 × 1 face. The singlet state is the ground state for all adsorbed systems here. Co-adsorption of H on the B–N Pandey chains is more favourable than lone hydrogen adsorption on either B or N. Molecular oxygen can chemisorb in a peroxy fashion on the B–N Pandey chain. For the 2 × 1 B face, the only stable structure to atomic O is a bridging oxygen position between B and N, with an adsorption energy of −3.23 eV per O atom. If the O atom is positioned above the B, the 2 × 1 B face will revert to 1 × 1 structure following dynamic optimization at 300 K, due to the strong interaction between boron atoms and these species.

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