Nanocomposites of polyaniline with iron oxide (PANI-Fe3O4) and copper ferrite (PANI-CuFe2O4) were prepared and characterized by FTIR, HRTEM, XRD and FESEM. HRTEM images reveals that the main size distributions are located in the range between 25–34 and 22–28 nm in case of PANI-CuFe2O4 and PANI-Fe3O4 nanocomposites, respectively. The dielectric constant value for PANI-Fe3O4 nanocomposites reaches a maximum value as high as ∼7000 (102 Hz), while the same for PANI-CuFe2O4 composite attains a maximum value of ∼2600 at 102 Hz. A quantitative estimation of the contribution of the grain boundary and resistance parameters has been attempted in terms of Maxwell-Wagner two-layered model.
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Haldar et al. (2014) studied this question.
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