New Aspects of Variable-range-hopping Conductivity in Doped Polyaniline

Babić, Dinko and Baćani, Mirko and Novak, Mario and Kokanović, Ivan (2010) New Aspects of Variable-range-hopping Conductivity in Doped Polyaniline. Croatica Chemica Acta, 83 (1). pp. 1-5. ISSN 0011-1643

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Temperature, T, dependence of the electrical conductivity, σ, of own-made polyaniline pellets, highly doped either by HCl or by dodecylbenzenesulphonic acid, is discussed. For the both dopants, a variable-range-hopping exponent 2/5 is found below T* ≈ 200 − 250 K. This result can be understood on the basis of a recent theory of Fogler, Teber and Shklovskii which takes into account Coulomb correlations in a three-dimensional system of chain-like conductors, predicting a power-law density of states for charge excitations around the Fermi energy. At T > T *, the σ(T) curves are steeper, implying a tendency towards nearest-neighbour hopping by a reduction of the average hopping length.

Item Type: Article
Keywords: doped polyaniline; electrical conductivity; hopping transport; Coulomb interaction
Date: 2010
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1008
Publisher: Hrvatsko kemijsko društvo
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 23 Apr 2014 18:38
Last Modified: 24 Feb 2016 15:38

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