Naslov
New aspects of variable-range-hopping conductivity in doped polyaniline

Autori
Babić, Dinko ; Baćani, Mirko ; Novak, Mario ; Kokanović, Ivan

Izvornik
Croatica chemica acta (0011-1643) 83 (2010), 1; 1-5

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
doped polyaniline; electrical conductivity; hopping transport; Coulomb

Sažetak
Temperature (T) dependence of the electrical conductivity s 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 s (T) curves are steeper, implying a tendency towards nearest-neighbour hopping by a reduction of the average hop length.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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