Aging effects in polypyrrole probed by positron annihilation

被引：3

作者：

Geffroy, B ^{[1
]}

Breivik, L

Corbel, C

Kauppinen, H

Liszkay, L

Barthe, MF

机构：

[1] CEA Saclay, SPE, DEIN, LETI, F-91191 Gif Sur Yvette, France

[2] CEA Saclay, INSTN, F-91191 Gif Sur Yvette, France

[3] KFKI Res Inst Nucl & Part Phys, Budapest, Hungary

[4] CERI, CNRS, F-45000 Orleans, France

来源：

SYNTHETIC METALS | 1999年 / 101卷 / 1-3期

关键词：

electron density; positron spectroscopy; conductivity; polypyrrole; thermal aging;

D O I：

10.1016/S0379-6779(98)00829-7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Positron annihilation spectroscopy and conductivity measurements have been used to probe aging-induced changes in para-hydroxybenzenesulfonate doped polypyrrole. Polypyrrole was synthesized by a chemical oxidation process and aged in air at 110 degrees C and 140 degrees C up to 250 days. Positron annihilation experiments reveal modifications of the electronic structure accompanied by a dramatic loss of conductivity as a function of the aging time and temperature. The electron-positron momentum distribution at the 511 keV annihilation peak exhibits a strong shift towards higher momentum annihilation events upon aging. The experimental results are explained in terms of positron trapping in the vicinity of negative dopants whose concentration is reduced after aging.

引用

页码：383 / 384

页数：2

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