Collect. Czech. Chem. Commun.
1989, 54, 1482-1495
https://doi.org/10.1135/cccc19891482
Electrical and electrochemical chracteristics of a new type of polyacetylene films
Jiří Pflegera, Ivan Kmíneka, Stanislav Nešpůreka, Vítězslav Papežb and Petr Novákb
a Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, 162 06 Prague 6
b The J. Heyrovský Institute of Physical Chemistry and Electrochemistry, Czechoslovak Academy of Sciences, 182 23 Prague 8
Abstract
The morphology, electrochemical and electrical properties of polyacetylene films, prepared with a catalytic system titanium tetrabutoxide/ethylmagnesium bromide in two forms–non-dried porous and dried compact ones–were studied. The properties of non-dried porous films as positive electrodes in lithium cells were characterized by means of cyclic voltammetry, electrochemical impedance measurements, galvanostatic cycling and “in situ” resistance measurements. The electrical conductivity of undoped dried compact films was 10-7 to 10-6 S m-1 depending on the oxygen content. Iodine doping increased the conductivity of these films up to σ = 7·6.103 S m-1, the conductivity of the trans-isomer (CHI0.27)x increased up to σ = 3.3.103 S m-1. From the temperature dependence of the electrical conductivity we have concluded that the transport of charge carriers is due presumably to the variable-range, phonon-assisted hopping of carriers between localized states, the density distribution function of which is not constant around the Fermi level.
