Effect of structural anisotropy on electrical and magnetic properties of polyaniline conducting films
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2013-03-12
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It is shown that highly conducting films of polyaniline protonated with di-esters of sulfosuccinic and sulfophthalic acids which contain alkyl- or alkoxy-type substituents exhibit highly anisotropic structural, electrical and magnetic properties. The layered-like structure of these films can be described as consisting of polyaniline chains which are mainly oriented parallel to the plane of the film and form regular out-of-plane stacks. These stacks are separated by bilayers of the dopant anions. Accordingly, the main anisotropy observed for solution cast films implies in-plane and out-of-plane measurements. An electrical anisotropy of about 80 is found for the in-plane and out-of-plane electronic conductivities at 5 K. The temperature dependences of the in-plane and out-of-plane conductivities are qualitatively similar and have been fitted as a series combination of variable-range-hopping-type and power law contributions. A maximum is observed in the temperature dependence of the electrical anisotropy at low temperature. The films also show a clear anisotropy of magnetization whose temperature and field characteristics depend on the chemical structure of the dopant anion. © 2013 Elsevier B.V.
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Anisotropy , Conductivity , Magnetic properties , Polyaniline , Structure , Bi-layer , Electrical and magnetic property , Electrical anisotropy , Electronic conductivity , Low temperatures , Out-of-plane , Polyaniline chains , Power-law contribution , Protonated , Solution-cast films , Structural anisotropy , Temperature dependence , Electric conductivity , Negative ions , Structure (composition) , Temperature distribution , Conductive films
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Synthetic Metals, v. 166, n. 1, p. 63-69, 2013.