Accession Number : ADA266235


Title :   A Simple Chemical Procedure for Extending the Conductive State of Polypyrrole to More Negative Potentials


Descriptive Note : Interim rept.


Corporate Author : COLORADO STATE UNIV FORT COLLINS DEPT OF CHEMISTRY


Personal Author(s) : Van Dyke, Leon S ; Kuwabata, Susumu ; Martin, Charles R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266235.pdf


Report Date : Jun 1993


Pagination or Media Count : 35


Abstract : The electronically conductive polymer polypyrrole is an electronic conductor at potentials positive of ca. -0.4 V vs. the saturated calomel electrode (SCE) and an electronic insulator at potentials negative of this value. As a result of this potential-dependent conductor/insulator transition, a polypyrrole film can be used as an electrode for redox couples with E(o)'s positive of ca. -0.4 V vs. SCE but cannot be used as an electrode for couples with E(o)'s negative of this value. We have discovered a simple chemical procedure that extends the conductive state of polypyrrole to ca. -1.1 V vs. SCE. This procedure entails treating the polypyrrole film with aqueous sodium hydroxide. We demonstrate this extension of the conductive state to more negative potentials in this paper. We also propose, and test, a chemical model that explains the extension of the conductive state


Descriptors :   *POLYMERS , *ELECTROCHEMISTRY , *ELECTRICAL CONDUCTIVITY , THIN FILMS , OXIDATION REDUCTION REACTIONS


Subject Categories : Physical Chemistry
      Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE