Sutar, Dayanand and Menon, Reghu and Subramanyam, SV (2002) Study of electrical conduction in polypyrrole by varying the doping level. In: Thin Solid Films, 417 (1-2). pp. 40-42.
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Electrical conductivity and thermopower are studied in the conducting polymer polypyrrole doped with varying levels of the dopant hexafluoro phosphate (PF6). A single sample is prepared by galvanostatic electrochemical polymerization at -40 degreesC. From this sample, six samples having different dopant levels and correspondingly different conductivity are prepared by dedoping. Low temperature d.c. electrical conductivity measurement shows the metal-insulator transition from fully doped sample to dedoped samples. On the metallic side the data are fitted to the localization-interaction model. In critical regime, it follows the power law. On the insulating side, it is variable range hopping. Thermopower measurements are done in the temperature range 300 K to 20 K. Thermopower is linear for samples on the metallic side and becomes more and more non-linear on the insulating side. It is described using a combination of the linear metallic term and the non-linear hopping term. (C) 2002 Elsevier Science B.V. All rights reserved.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Keywords:||Polymers;Electrical conductivity;Metalï¿½insulator transition;Thermopower|
|Department/Centre:||Division of Physical & Mathematical Sciences > Physics|
|Date Deposited:||28 Jul 2011 06:01|
|Last Modified:||28 Jul 2011 06:01|
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