Abstract
The frequency-dependent conductivity of TiO2-derived nanotubes pressed to a pellet was measured over the temperature range 100 to 390 K. The temperature dependence of the electrical conductivity measured at 100 Hz indicates a three-dimensional variable range hopping mechanism at higher temperatures and fluctuation-induced tunneling conduction below 300 K. From the frequency dependence of the conductivity it is possible to conclude that the conductivity is governed by two parallel channels. The first channel, dominating at higher temperatures, is characterized by the three-dimensional variable range hopping mechanism and the second channel, which takes over at lower temperatures, by the fluctuation-induced tunneling mechanism. Such a two-channel mechanism may be responsible for the similar temperature dependence of the electrical conductivity observed in some other three-dimensional systems.
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