Abstract
A percolation model has been proposed to explain an insulator-conductor transition in ultrananocrystalline diamond films upon addition of nitrogen to a gas mixture used to synthesize films. An observed jump of the conductivity by 10–12 orders of magnitude is a result of the rearrangement of the structure of films leading to the formation of diamond nanorods in a graphite shell. A nitriding-induced increase in the volume fraction of these nanorods (up to 0.22) has been determined from small-angle X-ray scattering data. Conduction occurs through graphite shells and the percolation threshold corresponds to the volume fraction of conducting nanorods of 0.06.
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Original Russian Text © I.I. Vlasov, M.V. Kanzyuba, A.A. Shiryaev, V.V. Volkov, V.G. Ral’chenko, V.I. Konov, 2012, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2012, Vol. 95, No. 7, pp. 435–439.
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Vlasov, I.I., Kanzyuba, M.V., Shiryaev, A.A. et al. Percolation model of an insulator-conductor transition in ultrananocrystalline diamond films. Jetp Lett. 95, 391–395 (2012). https://doi.org/10.1134/S0021364012070090
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DOI: https://doi.org/10.1134/S0021364012070090