Abstract
Nanometre-sized diamond has been found in meteorites1, protoplanetary nebulae2 and interstellar dusts3, as well as in residues of detonation4 and in diamond films5,6. Remarkably, the size distribution of diamond nanoparticles seems to be peaked around 2–5 nm, and to be largely independent of preparation conditions. We have carried out ab initio calculations of the stability of nanodiamond as a function of surface hydrogen coverage and of size. We have found that at about 3 nm, and for a broad range of pressures and temperatures, particles with bare, reconstructed surfaces become thermodynamically more stable than those with hydrogenated surfaces, thus preventing the formation of larger grains. Our findings provide an explanation of the size distribution of extraterrestrial and of terrestrial nanodiamond found in ultradispersed and ultracrystalline diamond films. They also provide an atomistic structural model of these films, based on the topology and structure of 2–3-nm dimond clusters consisting of a diamond core surrounded by a fullerene-like carbon network7.
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Acknowledgements
This work was performed under the auspices of the US Department of Energy by the University of California Lawrence Livermore National Laboratory under contract no. W-7405-Eng-48. J.Y.R. acknowledges support from the FNRS and the NOMADE contract no. 115052 from the Région Wallonne.
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Raty, JY., Galli, G. Ultradispersity of diamond at the nanoscale. Nature Mater 2, 792–795 (2003). https://doi.org/10.1038/nmat1018
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DOI: https://doi.org/10.1038/nmat1018
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