Abstract
Low temperature electrical transport properties of composite polypyrrole (PPy) films having ZnO-nanowires (ZnONWs) in the range of 0–50 wt. % have been investigated. It has been found that pure PPy film is in the critical regime of the metal-to-insulator transition, and adding ZnONWs drive composite films into the insulating regime. For PPy films, the transport is governed by Motts three-dimensional-variable range hopping (VRH) (ln ρ∼T−1/4) conduction and with increasing ZnONWs content above 10 wt. % results in a crossover to one-dimensional-VRH conduction (ln ρ∼T−1/2). It has been observed that films having ZnONWs content ≥10 wt. % exhibit reproducible hysteresis in the current-voltage characteristics.
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