期刊
ACS APPLIED MATERIALS & INTERFACES
卷 2, 期 9, 页码 2653-2662出版社
AMER CHEMICAL SOC
DOI: 10.1021/am100480s
关键词
Conducting polymer; impedance spectroscopy; charge transport; PEDOT; sensing
资金
- Department of Chemistry
- Bou Foundation
- Graduate School of Arts and Sciences of Georgetown University
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 similar to 10 Hz to 100 kHz). These results suggest that the behavior originates from the two-layer homogeneous morphology of the him. 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.
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