POTENTIAL DEPENDENCE OF THE CONDUCTIVITY OF HIGHLY OXIDIZED POLYTHIOPHENES, POLYPYRROLES, AND POLYANILINE - FINITE WINDOWS OF HIGH CONDUCTIVITY
POTENTIAL DEPENDENCE OF THE CONDUCTIVITY OF HIGHLY OXIDIZED POLYTHIOPHENES, POLYPYRROLES, AND POLYANILINE - FINITE WINDOWS OF HIGH CONDUCTIVITY
复制标题
DOI：
10.1021/ja00178a004
复制
发表时间：
1990-10-24
影响因子：
15
通讯作者：
WRIGHTON, MS
中科院分区：
文献类型：
--
作者：
OFER, D;CROOKS, RM;WRIGHTON, MS
原位测量的相对电导率的聚噻吩，聚苯胺，和聚吡咯作为电化学电位的函数表明，它们具有有限的电位依赖窗口的高电导率。此外，在电荷注入聚合物或从聚合物中抽出的地方发现高电导率。所研究的聚合物，聚苯胺和I-VI，通过阳极聚合到适当单体的微电极阵列上制备：噻吩（I），3-甲基噻吩（II），3-苯基噻吩（III），1-甲基-1 '-（3-（噻吩-3-基）丙基）-4，4'-联吡啶（IV），3，4-二甲基吡咯（V），和ZV-甲基吡咯（VI）。使用液体S 〇 2/电解质介质作为电化学溶剂使得可以限定高电导率的窗口，因为它允许聚合物被可逆氧化到比先前实现的更大的程度。当I-IV从中性氧化到最大电导率时，其电导率至少增加106-109，当进一步氧化到最大程度时，其电导率降低10 ~（-4），而在液体SO_2/电解质中不发生不可逆降解。循环伏安法表明，IV被~ 0.3电子/噻吩氧化
In situ measurements of the relativeconductivity of polythiophenes, polyaniline, and polypyrroles as a function of electrochemical potential reveal that they have finite potential dependent windows of high conductivity. Further, the high conductivity is found where charge is injected or withdrawn from the polymer. The polymers studied, polyaniline and I—VI, are prepared by anodic polymerization onto microelectrode arrays of the appropriate monomer: thiophene (I), 3-methylthiophene (II), 3-phenylthiophene (III), 1-methyl-1'-(3-(thiophene-3-yl) propyl)-4, 4'-bipyridinium (IV), 3, 4-dimethylpyrrole (V), andZV-methylpyrrole (VI). The use of a liquid S02/electrolyte medium as the electrochemical solvent makes it possible to define the window of high conductivity, because it allows the polymers to be reversibly oxidized to a greater extent than has previously been achieved. The conductivitiesof I—IV increase by at least 106-109 when they are oxidized from neutral to the potential of maximum conductivity and then decrease by IO'-4 when they are further oxidizedto the greatest extent possible without irreversible degradation in liquid S02/electrolyte. Cyclic voltammetry indicates that IV is oxidized by~ 0.3 electron per thiophene