Conductivity evolution of polypyrrole thin films with aging

被引：29

作者：

Sixou, B ^{[1
]}

Vautrin, M ^{[1
]}

Attias, AJ ^{[1
]}

Travers, JP ^{[1
]}

机构：

[1] OFF NATL ETUD & RECH AEROSP,DIRECT MAT,F-92322 CHATILLON,FRANCE

来源：

SYNTHETIC METALS | 1997年 / 84卷 / 1-3期

关键词：

transport measurements; conductivity; polypyrrole and derivatives; coatings; grain boundaries; HOPPING CONDUCTIVITY;

D O I：

10.1016/S0379-6779(96)04171-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Conductivity has been measured as a function of time t(a) during aging, and as a function of temperature for different aging times, on differently doped polypyrrole (PPy) in various conditions. We show that for the samples aged below 150 degrees C, a single expression describes both the temperature and the aging time dependences of the conductivity, In sigma(t(a),T)proportional to-(t(a)/T)(1/2). This corresponds to a hopping process between conducting grains separated by expanding insulating barriers upon aging. Moreover, the aging kinetics for different temperatures can be deduced from each others with scaling laws. The relative stabilities of PPy with various dopants have been compared. Slight deviations from the above behaviour, observed when aging above 150 degrees C, can be accounted for by a generalization of the model.

引用

页码：835 / 836

页数：2

共 4 条

[1]

SHENG P, 1983, PHYS REV B, V27, P2583, DOI 10.1103/PhysRevB.27.2583

[2] HOPPING CONDUCTIVITY IN GRANULAR METALS [J].

SHENG, P ;

ABELES, B ;

ARIE, Y .

PHYSICAL REVIEW LETTERS, 1973, 31 (01) :44-47

[3] Aging effects on the transport properties in conducting polymer polypyrrole [J].

Sixou, B ;

Mermilliod, N ;

Travers, JP .

PHYSICAL REVIEW B, 1996, 53 (08) :4509-4521

[4] TEMPERATURE AND AGING TIME-DEPENDENCE OF THE CONDUCTIVITY IN A CONDUCTING POLYMER - A UNIFIED PICTURE [J].

SIXOU, B ;

MERMILLIOD, N ;

TRAVERS, JP .

EUROPHYSICS LETTERS, 1995, 30 (03) :157-162

← 1 →