Abstract
Electrical transport properties of undoped polyaniline (Pani) and Pani doped with Fe, Ni and La ions (named Pani–Fe, Pani–Ni and Pani–La) have been investigated using dc and ac conductivity data. It is shown that the Pani–Fe sample follows 3D variable range hopping (VRH) conduction while the Pani, Pani–Ni and Pani–La samples follow 1D VRH conduction. These results are discussed by comparing with conventional HCl-doped Pani. Ac conductivity studies carried out in the frequency range 42 Hz–5 MHz reveal the influence of dopants on inter-chain interactions. The dielectric response exhibits two well resolved relaxation processes, which appear to indicate phase segregation of doped and undoped regions in the samples.
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