I. Krivka et al., Application of percolation concepts to electrical conductivity of polyaniline-inorganic salt composites, J MAT CHEM, 9(10), 1999, pp. 2425-2428
The dependence of the resistivity of protonated polyaniline-inorganic salt
composites with the volume fraction of electrically conducting component wa
s analyzed on the basis of percolation theory. A short analysis and a discu
ssion of basic treatment in the evaluation of percolation parameters are in
cluded. Microscopical observations showed a non-uniform distribution of pol
yaniline particles in the composites. The composites of polyaniline sulfate
with ammonium sulfate and potassium bromide have a low percolation thresho
ld (<3 vol.% conducting component). This has been explained as a property o
f the segregated structure of the composites, which is formed because of a
large difference in the particle sizes. Basic quantitative characteristics
of the morphological structure have been obtained using the percolation mod
el, as proposed by Ewen and Robertson, to explain the properties of thick f
ilm resistors.