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

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-1D diffusi...

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Bibliographic Details
Published in:Synthetic metals 1999-05, Vol.101 (1-3), p.772-775
Main Authors: Beau, B., Travers, J.P., Banka, E.
Format: Article
Language:English
Subjects:
Applied sciences
Electrical, magnetic and optical properties
Exact sciences and technology
Molecular dynamics
Nuclear magnetic resonance spectroscopy
Organic polymers
Physicochemistry of polymers
Polyaniline
Properties and characterization
Transport measurements
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Summary: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-1D 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.
ISSN:0379-6779
1879-3290
DOI:10.1016/S0379-6779(98)00357-9