Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3266525
Keywords
conducting polymers; hopping conduction; II-VI semiconductors; metal-insulator transition; nanocomposites; nanowires; organic semiconductors; polymer films; wide band gap semiconductors; zinc compounds
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Funding
- DAE-SRC Outstanding Research Investigator Award [2008/21/05-BRNS]
- Prospective Research Funds [2008/38/02-BRNS]
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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 rho similar to T-1/4) conduction and with increasing ZnONWs content above 10 wt. % results in a crossover to one-dimensional-VRH conduction (ln rho similar to 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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