1. Charge transport in polypyrrole:ZnO-nanowires composite films.
- Author
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Singh, A., Joshi, Aditee, Samanta, S., Debnath, A. K., Aswal, D. K., Gupta, S. K., and Yakhmi, J. V.
- Subjects
ELECTRIC conductivity research ,COMPOSITE materials ,ELECTRIC properties ,ZINC oxide ,NANOWIRES ,POLYMERS in electrical insulation ,LOW temperatures - 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. [ABSTRACT FROM AUTHOR]- Published
- 2009
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