PEDOT/PAMPS: an electrically conductive polymer composite with electrochromic and cation exchange properties

Sönmez, Gürsel and Schottland, Philippe and Reynolds, John R. (2005) PEDOT/PAMPS: an electrically conductive polymer composite with electrochromic and cation exchange properties. Synthetic metals, 155 (1). pp. 130-137. ISSN 0379-6779

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Poly(3,4-ethylenedioxythiophene) (PEDOT)/poly(2-acrylamido-2-methyl-l-propane sulfonate) (PAMPS) composite films were electrochemically prepared from a mixture of water and N,N-dimethylformamide (DMF) containing 3,4-ethylenedioxythiophene (EDOT) and the polyelectrolyte, PAMPS. The presence of PAMPS in the PEDOT matrix was confirmed by spectroscopic and electrochemical methods. Depending on the current density, the conductivity of PEDOT/PAMPS free standing composite films reached values of 80 S/cm. Spectroelectrochemistry of neutralized PEDOT/PAMPS composite films showed a maximum absorption at 2.0 eV (615 nm) and a band gap of 1.65 eV, as calculated from the onset of the π–π* transition. Thin PEDOT/PAMPS composite films were found to switch rapidly between oxidized and reduced states in less than 0.4 s with an initial optical contrast of 76% at λmax: 615 nm. The morphology of the polymer composites demonstrates a cauliflower structure. Despite the high molecular weight of the polyelectrolyte, the film density was found to be similar to classical PEDOT (i.e., ca. 1.4 g/cm3), while the surface roughness averaged below 5%. As expected with the use of a sulfonated polyelectrolyte as dopant, cation exchange properties were observed with hexaammineruthenium(III) chloride as an active electrolyte.
Item Type: Article
Uncontrolled Keywords: conducting polymer; poly(3,4-ethylenedioxythiophene); PEDOT; poly(2-acrylamido-2-methyl-1-propane sulfonic acid); cation exchange; spectroelectrochemistry
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Gürsel Sönmez
Date Deposited: 13 Oct 2005 03:00
Last Modified: 26 Apr 2022 08:10

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