Contrast in the electrical and opto-electrical properties exhibited by randomly distributed networks and vertically aligned mutil-wall carbon nanotubes

The modification of the electrical and opto-electrical response associated with the alignment of carbon nanotubes was comparatively investigated. The samples were prepared as randomly distributed networks and vertically aligned carbon nanotubes. A notable variation in the electrical impedance behavior was found to switch from an inductance to a capacitance performance, resulting from the alignment of the tubes. We particularly highlighted important distinctions in the photoconductive effects exhibited by the samples with a strong dependence on angle of incidence. Single-beam transmittance experiments were conducted to confirm a close relation between photoconduction and nanosecond third order nonlinear optical interactions with dependence on pulse repetition rate. Potential applications for developing low-dimensional optoelectronic functions can be considered.