Investigation of near ohmic behavior for poly(3,4-ethylenedioxythiophene): a model consistent with systematic variations in polymerization conditions

Yohani P Kayinamura; Marc Ovadia; Daniel Zavitz; J Faye Rubinson

doi:10.1021/am100480s

Investigation of near ohmic behavior for poly(3,4-ethylenedioxythiophene): a model consistent with systematic variations in polymerization conditions

ACS Appl Mater Interfaces. 2010 Sep;2(9):2653-62. doi: 10.1021/am100480s.

Authors

Yohani P Kayinamura¹, Marc Ovadia, Daniel Zavitz, J Faye Rubinson

Affiliation

¹ Department of Chemistry, Georgetown University, 37th and O Streets, NW, Washington, DC 20057, USA.

PMID: 20715789
DOI: 10.1021/am100480s

Abstract

The impedance behavior of semiconducting polymer film electrodes based on poly(3,4-ethylenedioxythiophene) (PEDOT) in combination with a series of anionic dopants has been investigated using electrochemical impedance spectroscopy (EIS) over the frequency range from 0.1 Hz to 100 kHz. Films were electrodeposited on gold-coated Pt wire electrodes from a nonaqueous solution containing 3,4-ethylenedioxythiophene (EDOT). EIS results reveal that, under the optimal synthesis conditions, PEDOT electrodes consistently exhibit low, frequency-independent impedance over a wide frequency range (from ∼10 Hz to 100 kHz). These results suggest that the behavior originates from the two-layer homogeneous morphology of the film. A model for conduction in the films that is supported by experimental evidence is proposed, and EIS data for electrodes produced under a variety of electropolymerization conditions are presented.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Bridged Bicyclo Compounds, Heterocyclic / chemistry*
Combinatorial Chemistry Techniques / methods*
Computer Simulation
Electric Impedance
Models, Chemical*
Polymers / chemistry*

Substances

Bridged Bicyclo Compounds, Heterocyclic
Polymers
poly(3,4-ethylene dioxythiophene)