NMR evidence for heterogeneous disorder and quasi-1D metallic state in polyaniline CSA

被引：29

作者：

Beau, B ^{[1
]}

Travers, JP ^{[1
]}

Banka, E ^{[1
]}

机构：

[1] Univ Grenoble 1, CEA, DRFMC, CNRS,UMR 5819,Lab Phys Met Synthet, F-38054 Grenoble 9, France

来源：

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

关键词：

D O I：

10.1016/S0379-6779(98)00357-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Spin dynamics has been investigated by NMR techniques in highly conducting CSA doped polyaniline (PANI-CSA). Proton nuclear relaxation times have been measured as a function of frequency and temperature. Effective intra and interchain diffusion rates are determined in the frame of a quasi-ID diffusion model. The results are analyzed in the frame of an heterogeneous disorder with metallic regions (crystalline or well-ordered parts), linked by poorly conducting electronically isolated chains (amorphous parts). Spin carriers execute a strongly anisotropic quasi-1D motion in both types of region. Hopping motion in disordered regions appears as the limiting mechanism in the conduction process.

引用

页码：772 / 775

页数：4

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