Electrical properties of carbon nanotubes / $\mathrm{WS}_2$ nanotubes (nanoparticles) hybrid films

DC and AC electrical properties of hybrid films, consisting of carbon nanotubes and tungsten disulfide nanotubes (and fullerene like nanoparticles) were studied within the 2 – 300 K temperature range and over the 20 Hz – 1 MHz frequency range. The temperature dependences of the resistance $R(T)$ exhibit behavior typical for the fluctuation-induced tunneling model in the intermediate temperature range. Analysis of the dependences of real and imaginary components of the impedance on the frequency ($Z'(f)$ and $Z''(f)$) demonstrates the rising role of the contact barriers between carbon nanotubes inside hybrid films, consisting of the carbon nanotubes and inorganic tungsten disulfide nanotubes as the temperature was decreased. The active component of the impedance was found to prevail in the AC electrical properties of the hybrid films, consisting of multiwall carbon nanotubes and $\mathrm{WS}_2$ nanoparticles over the entire available temperature range.