Effects of amination and adsorption of ammonia on the electrical conductivity of the detonation nanodiamond powders
In the present work, the temperature dependence of the static Gdc(T) and dynamic conductivity Gac(T, f) of detonation nanodiamond powders in the frequency range 25-10 6 Hz and 300<T<800 K have been studied. Data on Gdc(T) and Gac(T,f) were obtained for the initial and aminated samples. It has shown that the value of electroconductivity for the intial and amianted nanodiamond powders differs by 2,5 order. A value of activation energy decreases compared to the original and equals 0.46 eV. Data on the effect of ammonia adsorption on Gdc(T), Gac(T, f) and the frequency dependence of dielectric permeability (?) were obtained for powders of DND at room temperature. The effect of giant dielectric permeability increase at low frequencies was found. After exposure to ammonia within 48 hours, the dielectric permeability changes from 15 to 2,1?105 for initial sample at a 25 Hz, and at 1 kHz from 11 to 1.6?103 for UDD-SP,..