Synthesis, Characterization and Electrical Properties of Polyaniline/Srtio3 Composites

DOI : http://dx.doi.org/10.13005/msri/060123

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In the present work, synthesis of Polyaniline (PANI) is carried out by chemical oxidation method by using ammonium persulphate as an oxidant. PANI- SrTiO3 composites were synthesized by using various weight percentages (10, 20, 30, 40 and 50wt %) of SrTiO3 in PANI by insitu polymerization. The composites are characterized by using various techniques such as XRD and SEM. XRD micrographs indicate that SrTiO3 is homogeneously distributed in the PANI. SEM micrograph indicates that PANI / SrTiO3 have many aggregated pores. The Dielectric constant and Dielectric tangent loss are studied by sandwiching the pellets of these composites between the silver electrodes. It is observed that dielectric constant decreases with increasing frequency where as at higher frequencies dielectric constant remains constant. PANI and its composites exhibit small value of dielectric loss at higher frequency. The AC conductivity is studied in the frequency range from 102Hz-106Hz. From these studies it is found that, AC conductivity remains constant at lower frequency and increase rapidly at higher frequency, which is characteristics behaviour of disordered materials. Hence, this composite finds applications such as sensor devisees.

Polyaniline (PANI); Polyaniline composites (PANI/ SrTiO3); Transport properties