Investigation of near ohmic behavior for poly(3,4-ethylenedioxythiophene): a model consistent with systematic variations in polymerization conditions.
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.
Kayinamura
Yohani P
YP
Department of Chemistry, Georgetown University, 37th and O Streets, NW, Washington, DC 20057, USA.
Ovadia
Marc
M
Zavitz
Daniel
D
Rubinson
J Faye
JF
D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry*; D020650:Combinatorial Chemistry Techniques / Q000379:methods*; D003198:Computer Simulation; D017097:Electric Impedance; D008956:Models, Chemical; D011108:Polymers / Q000737:chemistry*
D019086:Bridged Bicyclo Compounds, Heterocyclic; D011108:Polymers; C121383:poly(3,4-ethylene dioxythiophene)