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Durham University

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Publication details for Professor Andy Monkman

TRAVERS, JP, LEGUYADEC, P, ADAMS, PN, LAUGHLIN, PJ & MONKMAN, AP (1994). SPIN DYNAMICS STUDY IN POLYANILINE - MACROSCOPIC AND MICROSCOPIC TRANSPORT PROPERTY RELATIONSHIP. Synthetic Metals 65(2-3): 159-166.
  • Publication type: Journal Article
  • ISSN/ISBN: 0379-6779
  • Keywords: POLYANILINE; TRANSPORT; SPIN DYNAMICSCONDUCTING POLYMERS; HOPPING CONDUCTIVITY; NUCLEAR-RELAXATION; POLYACETYLENE; DIFFUSION; CHAINS; STATES; SYSTEM; FILMS

Author(s) from Durham

Abstract

Proton spin lattice relaxation times T1 have been measured in the
frequency range 7-95 MHZ on a set of unstretched and stretched
polyaniline films, together with d.c. conductivity. A highly
anisotropic quasi 1D spin diffusion is evidenced in all the samples. It
is shown that while stretching increases parallel d.c. conductivity, it
favours interchain hoppings at the microscopic scale. These results are
interpreted in a coherent picture that links the macroscopic transport
properties to the microscopic ones. In particular, d.c. conductivity
anisotropy is shown to be of geometrical nature when the microscopic
transport anisotropy is very high. It is also concluded that the
carrier mean free path is not consistent with metallic conductivity.