STUDY ON THE ELECTRICAL-CONDUCTION MECHANISM OF POLYPYRROLE FILMS

被引:120
作者
SATO, K
YAMAURA, M
HAGIWARA, T
MURATA, K
TOKUMOTO, M
机构
[1] RES ASSOC BASIC POLYMER TECHNOL,MINATO KU,TOKYO 105,JAPAN
[2] ELECTROTECH LAB,TSUKUBA,IBARAKI 305,JAPAN
关键词
D O I
10.1016/0379-6779(91)91487-U
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The electrical conduction mechanism of polypyrrole films containing various counter ions was investigated. Above 100 K the temperature dependence of electrical conductivity obeyed the Mott equation based on variable range hopping. The exponential factor (T0) increased as the size of counter ion increased, while the pre-exponential factor (K0) was independent of the size. The enhancement of conductivity (sigma-parallel to) in the stretch direction upon stretching was explained by the increase of the hopping attempt frequency (nu-0). The temperature dependence of the conductivity of the films containing small counter ions fitted well the Sheng equation from room temperature down to 10 K suggesting that the conduction is dominated more strongly by tunneling than by hopping in a lower temperature region. The conductivity of a film containing PF6- showed a metallic-like temperature dependence below 20 K where the apparent magnetoresistance was positive.
引用
收藏
页码:35 / 48
页数:14
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