2019 Impact factor 1.812
Soft Matter and Biological Physics
Eur. Phys. J. E 2, 207-210

Dispersion-induced insulator-to-metal transition in polyaniline

B. Wessling1 - D. Srinivasan2 - G. Rangarajan2 - T. Mietzner3 - W. Lennartz3

1 Ormecon Chemie (a subsidiary of Zipperling Kessler & Co) Ammersbek, Germany
2 Department of Physics, Indian Institute of Technology, Madras, India
3 II. Department of Physics, University of Cologne, Germany

Received 11 May 1999 and Received in final form 22 November 1999

Melt dispersion processing--without solvents or "secondary dopants''--pushes polyaniline reproducibly to the metallic side of the IM transition, although the undispersed polyaniline is on the insulator side. This is the first time that a conductive polymer is found there without applying pressure. The transition to the metallic state is associated with a decrease of the C6-N-C6 angle from $166{^\circ}$ to $134{^\circ}$.

71.30.+h Metal-insulator transitions and other electronic transitions - 75.40.Cx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) - 61.10.-i X-ray diffraction and scattering

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