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Structural, chemical and electrochemical characterization of poly(3,4-ethylenedioxythiophene) (PEDOT) prepared with various counter-ions and heat treatments |
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| Authors: | King Zachary A Shaw Charles M Spanninga Sarah A Martin David C |
| Affiliation: | a Department of Biomedical Engineering, The University of Michigan, 2200 Bonisteel Blvd., Ann Arbor, MI 48109-2099, USA b Macromolecular Science and Engineering Center, The University of Michigan, 2300 Hayward Ave., Ann Arbor, MI 48109-2136, USA c Department of Materials Science and Engineering, The University of Michigan, 2300 Hayward Ave., Ann Arbor, MI 48109-2136, USA d Department of Materials Science and Engineering, The University of Delaware, 201C DuPont Hall, Newark, DE 19716, USA |
| Abstract: | Electrochemical deposition of the conjugated polymer poly(3,4-ethylenedioxythiophene) (PEDOT) forms thin, conductive films that are especially suitable for charge transfer at the tissue-electrode interface of neural implants. For this study, the effects of counter-ion choice and annealing parameters on the electrical and structural properties of PEDOT were investigated. Films were polymerized with various organic and inorganic counter-ions. Studies of crystalline order were conducted via X-ray diffraction (XRD). Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) were used to investigate the electrical properties of these films. X-ray photoelectron spectroscopy (XPS) was used to investigate surface chemistry of PEDOT films. The results of XRD experiments showed that films polymerized with certain small counter-ions have a regular structure with strong (100) edge-to-edge correlations of PEDOT chains at ∼1.3 nm. After annealing at 170 °C for 1 h, the XRD peaks attributed to PEDOT disappeared. PEDOT polymerized with LiClO4 as a counter-ion showed improved impedance and charge storage capacity after annealing at 160 °C. |
| Keywords: | Conducting polymers PEDOT XRD |
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