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We investigate the transport properties of granular nickel electrodeposited on carbon nanotube fibers bymeasuring the electrical resistance and the current voltage characteristics as a function of the temperature.The bare fiber is governed by a three-dimensional variable range hopping transport mechanism, however, asemiconducting to metallic transition is observed after the Ni deposition as a consequence of the evolution fromweak to strong coupling between the deposited nickel grains. The experimental results indicate that the chargetransport in the Ni-coated fiber develops from hopping governed by the Coulomb blockade in the case of smallgrains dimensions to a metallic electron phonon interaction mechanism for large grains dimensions. Tunnelingenhanced by thermal fluctuation is responsible for the transport in the intermediate conductivity range. The roleof the fiber and the effects due to the magnetic nature of the nickel grains are also discussed

Transport mechanism in granular Ni deposited on carbon nanotubes fibers