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Title: Ab initio studies of hydrogen and oxygen chemisorptions on the cubic BN(1 1 1) surface
Authors: Yang, S.W. 
Loh, K.P. 
Wu, P. 
Keywords: Ab initio
Ab initio calculations
Boron nitride
c-BN surface
Density functional theory
DFT calculation
Surface absorptions and surface reactions
Issue Date: 30-Dec-2005
Citation: Yang, S.W., Loh, K.P., Wu, P. (2005-12-30). Ab initio studies of hydrogen and oxygen chemisorptions on the cubic BN(1 1 1) surface. Surface Science 599 (1-3) : 128-140. ScholarBank@NUS Repository.
Abstract: 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. © 2005 Elsevier B.V. All rights reserved.
Source Title: Surface Science
ISSN: 00396028
DOI: 10.1016/j.susc.2005.10.003
Appears in Collections:Staff Publications

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