Electrochemically induced volume changes in poly(3,4-ethylenedioxythiophene)

被引:83
作者
Chen, XW [1 ]
Xing, KZ [1 ]
Inganas, O [1 ]
机构
[1] LINKOPING UNIV,IFM,DEPT PHYS,S-58183 LINKOPING,SWEDEN
关键词
D O I
10.1021/cm9600034
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
The electrochemical properties of poly(3,4-ethylenedioxythiophene) are studied using the bending beam method to detect volume changes during electrochemical transformations of the material. Thin films of poly(3,4-ethylenedioxythiophene) immersed in different supporting electrolytes first contract very rapidly and then expand on doping, while upon undoping they contract directly, or first expand and then contract, to their original positions. It is clearly observed that the oxidation or reduction of the polymer contains two steps, one due to a redox potential close to -0.5 V vs Ag/AgCl, and another potential around 0 V. We find that the volume changes cannot be understood as a simple consequence of ion transport but must be due to the structural change of the polymer between the different states. A hypothetical picture is that during the transition from the neutral to the polaron state, the polymer is slightly charged and thus contracted; on further doping to the bipolaron and to the metallic state, the coulomb repulsion between charged sites become stronger, and the polymer expands.
引用
收藏
页码:2439 / 2443
页数:5
相关论文
共 72 条
[1]   ELECTROCHEMICAL OXIDATION OF 5-UNIT HETEROCYCLES - A DISCUSSION ON THE POSSIBLE DIMERIZATION MECHANISMS [J].
AUDEBERT, P ;
CATEL, JM ;
LECOUSTUMER, G ;
DUCHENET, V ;
HAPIOT, P .
JOURNAL OF PHYSICAL CHEMISTRY, 1995, 99 (31) :11923-11929
[2]  
BAUERLE P, 1993, J AM CHEM SOC, V115, P10217
[3]  
BAUERLE P, 1993, ANGEW CHEM INT EDIT, V32, P76, DOI 10.1002/anie.199300761
[4]  
Baughman R.H., 1991, Micro Electromechanical Actuators Based on Conducting Polymers BT-Molecular Electronics: Materials and Methods, P267, DOI DOI 10.1007/978-94-011-3392-0_27
[5]  
BAUGHMAN RH, 1991, SCIENCE AND APPLICATIONS OF CONDUCTING POLYMERS, P47
[6]   HIGHLY CONDUCTING POLYPARAPHENYLENE, POLYPYRROLE, AND POLYTHIOPHENE CHAINS - AN ABINITIO STUDY OF THE GEOMETRY AND ELECTRONIC-STRUCTURE MODIFICATIONS UPON DOPING [J].
BREDAS, JL ;
THEMANS, B ;
FRIPIAT, JG ;
ANDRE, JM ;
CHANCE, RR .
PHYSICAL REVIEW B, 1984, 29 (12) :6761-6773
[7]  
CHEN X, IN PRESS J PHYS CHEM
[8]   DOPING-INDUCED VOLUME CHANGES IN POLY(3-OCTYLTHIOPHENE) SOLIDS AND GELS [J].
CHEN, XW ;
INGANAS, O .
SYNTHETIC METALS, 1995, 74 (02) :159-164
[9]   STRUCTURE PROPERTY RELATIONSHIPS IN ALKOXY-SUBSTITUTED POLYTHIOPHENES [J].
DAOUST, G ;
LECLERC, M .
MACROMOLECULES, 1991, 24 (02) :455-459
[10]   ELECTROPLATING OF CONDUCTIVE POLYMERS FOR THE METALLIZATION OF INSULATORS [J].
DELEEUW, DM ;
KRAAKMAN, PA ;
BONGAERTS, PEG ;
MUTSAERS, CMJ ;
KLAASSEN, DBM .
SYNTHETIC METALS, 1994, 66 (03) :263-273