Synthesis, Characterization and A.C. Conductivity Study of Polypyrrole/Zinc Tungstate (Ceramic) Composites

In-situ polymerization of pyrrole (Py) was carried out with Zinc Tungstate (ceramic) in the presence of oxidizing agent ammonium persulphate to synthesize polypyrrole (PPy)/Zinc Tungstate (ZnWO4) by chemical oxidation method. The PPy/ ZnWO4 composites were synthesized with various compositions viz., 10, 20, 30, 40 and 50 wt. % of NaVO3 in Py. The surface morphologies of these composites were analyzed using Scanning Electron Microscopy (SEM), show that ZnWO4 particles are embedded in PPy chain to form multiple phases. The Fourier Transform Infra-Red Spectroscopy (FTIR) reveals the stretching frequencies were shifted towards higher frequency side. The powder X-ray diffraction (XRD) spectrograph, suggests that they exhibit semi-crystalline behavior. Thermal analysis (TG/DTA) studies/testing were done and reported. The frequency dependent A.C. conductivity reveals that, the ZnWO4 concentration in PPy is responsible for the variation of conductivity of the composites. Values of the conductivity were increases till wt. 50% ZnWO4 in PPy. The dimensions of ZnWO4 particles in the matrix have a greater influence on the conductivity values.