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Novel Solid Nano Diamond/Pyrocarbon Semiconductor Materials

Published online by Cambridge University Press:  17 March 2011

Sergey K. Gordeev ,
Peter I. Belobrov ,
Nikolay I. Kiselev ,
Eleonora A. Petrakovskaya  and
Thommy C. Ekstrom
Sergey K. Gordeev
Affiliation:
Central Research Institute for Materials, St. Petersburg, RUSSIA
Peter I. Belobrov
Affiliation:
Kirensky Institute of Physics & Institute of Biophysics SB RAS, Krasnoyarsk, RUSSIA
Nikolay I. Kiselev
Affiliation:
Kirensky Institute of Physics & Institute of Biophysics SB RAS, Krasnoyarsk, RUSSIA
Eleonora A. Petrakovskaya
Affiliation:
Kirensky Institute of Physics & Institute of Biophysics SB RAS, Krasnoyarsk, RUSSIA
Thommy C. Ekstrom
Affiliation:
Skeleton Technologies Group, Stockholm, SWEDEN
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Abstract

Porous solids made of nano diamonds cemented by pyrocarbon show a semiconductor behavior where the properties are controlled by the factor γ = mass ratio of sp2/sp3 phases. The volume electrical conductivity μ (T) was measured in the temperature range 77 - 290 K as a function of γ. By controlling the ratio γ from 0 to 50 %, the electrical conductivity will change by 12 orders of magnitude. The semiconductor activation energy depends on γ-ratio and has values between 0.03 - 0.3 eV. The variable-range hopping conduction was checked by measuring μ against T and to look for a T1/4 dependence. A positive thermoelectric power showed that NDC was p-semiconductor with a narrow band gap. The paramagnetic nanodiamonds, g = 2.0027(1) and δH = 0.86(2) mT, will still have this property in the NDC material and both the g-value and line width are not dependent on γ-ratio and temperature. The concentration of unpaired electrons is 41019 spin/g that equals to one dangling bond per nanodiamond particle. Absences of magnetoresistance and Hall potential were observed for all NDC materials. This was interpreted as resulting from a Tamm - Lifshitz - Pekar electronic conduction mechanism within onedimensional band of surface states.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 638: Symposium F – Microcrystaline & Nanocrystalline Semiconductors-2000 , 2000 , F14.16.1
Copyright
Copyright © Materials Research Society 2001

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