I. I. Vlasov, M. V. Kanzyuba, A. A. Shiryaev, V. V. Volkov, V. G. Ral'chenko, V. I. Konov, “Percolation model of an insulator-conductor transition in ultrananocrystalline diamond films”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2012, Volume 95, Issue 7,Pages <nobr>435

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Percolation model of an insulator-conductor transition in ultrananocrystalline diamond films

I. I. Vlasov^a, M. V. Kanzyuba^a, A. A. Shiryaev^b, V. V. Volkov^c, V. G. Ral'chenko^a, V. I. Konov^a

^a A. M. Prokhorov General Physics Institute, Russian Academy of Sciences
^b Institute of Physical Chemistry and Electro Chemistry, Russian Academy of Sciences, Moscow
^c Institute of Cristallography RAS

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.

Received: 26.12.2011
Revised: 27.02.2012