The effect of pH on the electrochemical over-oxidation in PEDOT:PSS films

被引：121

作者：

Tehrani, Payman ^{[1
]}

Kanciurzewska, Anna ^{[1
]}

Crispin, Xavier ^{[1
]}

Robinson, Nathaniel D. ^{[1
]}

Fahlman, Mats ^{[1
]}

Berggren, Magnus ^{[1
]}

机构：

[1] Linkoping Univ, LiU Norrkoping, Dept Sci & Technol, SE-60174 Norrkoping, Sweden

来源：

SOLID STATE IONICS | 2007年 / 177卷 / 39-40期

关键词：

poly(3,4-ethylenedioxythiophene); degradation; over-oxidation; XPS; FTIR; conjugated polymer; polythiophenes;

D O I：

10.1016/j.ssi.2006.10.008

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Chemical degradation of conjugated polymers is one cause of material failures in polymer-based (opto)electronic devices, but can also be used as a technique for subtractive patterning of polymer films. When a large anodic potential is applied to the conducting polymer blend poly(3,4-ethylenedioxythiophene)-poly(4styrenesulfonate), PEDOT:PSS, an over-oxidation reaction occurs, altering its electrical conductivity. Here, we have studied the effect of pH on the electrochemical over-oxidation process of PEDOT in PEDOT:PSS. High pH is associated with a decrease of over-oxidation potential and an increase of resistivity in the resulting film. Vibrational spectroscopy and photoelectron spectroscopy measurements on over-oxidized PEDOT:PSS films indicate that the decrease in conductivity results from cleavage of the conjugation pathway accompanied by the formation of sulfone, carbonyl and carboxylic groups in the polymer chain. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：3521 / 3527

页数：7

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