Mechanism of conduction in doped polyaniline

Abstract

The conductivity of -doped emeraldine polymers is studied as a function of temperature in the range . The dopant concentration of the samples varies between 0.1 M and 1.0 M. The temperature dependence of the dc electrical conductivity gives evidence for a transport mechanism based on variable-range hopping in three dimensions. Using Mott's formula for the dc conductivity, physically meaningful values of the density of states at the Fermi energy, the hopping energy and hopping distance are calculated.

Vacuum-deposited poly(o-methoxyaniline) thin films: Structure and electronic properties

“…For calculating R the values a (1 nm) and m ph (10 13 Hz) given in [24] have been used because chemical structures POMA and PANI are similar [1].…”

On the ‘curiosity’ of electrical self‐heating, static charge and electromagnetic shielding effectiveness from carbon black/aluminium flakes reinforced epoxy‐resin composites

“…When the ϕ is below 20 phr, no physical contact will be formed and a short‐range percolation coherence length (ξ) exit with the conduction only occurring within grains, which are smaller than ξ, and the composites show electrical insulating. The increase of the incorporation of CBA into polymeric chains of epoxy results in the increase in the charge transfer into epoxy matrix and ξ increases infinitely and the composites becomes isotropically conductive (ie the infinite conductive network will be formed and ξ → ∞) 25. This will increase the doping level of these epoxy composites and consequently, it will exhibit more conductivity.…”

“… where f is the frequency, µ r is the relative permeability and d is the thickness of the sample. The skin depth ( SD ) of electromagnetic radiation is given by:25 …”

Electrospun Polyaniline/Poly(ethylene oxide) Composite Nanofibers Based Gas Sensor

“…The r is determined by the dimension of researching system. For 1, 2 and 3 dimensional systems, r is equal to 2, 3 and 4, respectively [59]. Figure S-2f (Supporting Information) showed the power law plots, where the analysis of our data of three-dimensional variable range hopping (3D VRH) model gave the highest correlation coefficient, demonstrating that the electron transportation was assumed to be three-dimensional, following the variable-range model, DC conductivity is given by: The present calculated values of electron hopping distance ( Figure S-2h Supporting Information) ranges approximately from 0.4 to 0.65 , which follows the requirements of Motts theory where the product of aR is comparable to 1.…”

“…The PANI can be assumed to be a 3D long-conjugated system since the full chains are divided into finite-length fragments, and the incorporation of PEO into the nanofibers diminishes the order degree of polymer chains. HCl-doped [61] and H 2 SiF 5 -doped PANI salt [59] have been studied as the 3D variable-range hopping mechanism. Our TCR results indicated the electron hopping in the composite PANI/PEO nanofibers is 3-dimensional.…”