Structural, chemical and electrochemical characterization of poly(3,4-Ethylenedioxythiophene) (PEDOT) prepared with various counter-ions and heat treatments

POLYMER

卷:52

Article

King, Zachary A.²  Shaw, Charles M.³  Spanninga, Sarah A.³  Martin, David C.^1,2,3,4 

[1] Univ Delaware, Dept Mat Sci & Engn, Newark, DE 19716 USA

[2] Univ Michigan, Dept Biomed Engn, Ann Arbor, MI 48109 USA

[3] Univ Michigan, Ctr Macromol Sci & Engn, Ann Arbor, MI 48109 USA

[4] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

关键词: Conducting polymers;    PEDOT;    XRD;   

DOI  :  10.1016/j.polymer.2011.01.042

来源: Elsevier

【 摘 要 】

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 similar to 1.3 nm. After annealing at 170 degrees 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 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.

【 授权许可】

Free