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(a) Arrhenius plot of the (normalized) conductivity with inverse temperature of films and normalized conductivity for , , and fitted (solid lines) with Eq. (1). (b) VRH plots of the same samples where the conductivity for is fitted.
Variation of reduced activation energy with temperature of the films. Inset: microstructure of carbon consists of graphitic layers and tunnel barriers of carbon.
(a) Conductivity vs and linear fit to the data for different temperature regions of the curves. Inset: model fit of conductivity [using Eq. (2)] for and , films. (b) Conductivity with . Inset: dependence at low temperature regions. Standard deviations for the data fit are shown.
Conductivity and characteristics lengths derived from experimental data.
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