Abstract
Presented here are results of ab initio Density Functional Theory (DFT) structural relaxations performed on dehydrogenated and monohydrogenated nanocrystalline diamond structures of octahedral {111} and cuboctahedral morphologies, up to approximately 2nm in diameter. Our results in this size range show a transition of dehydrogenated nanodiamond clusters into carbon onion-like structures, with preferential exfoliation of the C(111) surfaces, in agreement with experimental observations. However, we have found that this transition may be prevented by hydrogenation of the surfaces. Bonding between atoms in the surface layers of the relaxed structures, and interlayer bonding has been investigated using Wannier functions.
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Barnard, A.S., Marks, N.A., Russo, S.P. et al. Hydrogen Stabilization of {111} Nanodiamond. MRS Online Proceedings Library 740, 34 (2002). https://doi.org/10.1557/PROC-740-I3.4
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DOI: https://doi.org/10.1557/PROC-740-I3.4