The conducting polyaniline (PANI) and PANI doped with tungsten oxide (WO3) with varying wt% of WO3 are prepared by using in-situ chemical oxidative polymerization method. The X-ray diffraction it clearly reveals that pure PANI is amorphous whereas PANI/WO3 composites are in crystalline in nature. The electrical conductivity studied by four probe technique at 30–200°C. All the composites showed increase in conductivity values with the increase in WO3 content where the composite with 45% WO3 content showed highest value of 0.12 S/cm while the lowest conductivity of 0.06 S/cm was found in 5% WO3 content composite. The dielectric constant shows unusual response with respect to frequency with very high dielectric constant of 4.191X103 at 3X106 Hz for 45 wt% of WO3 in PANI, which attributes to the stronger localization of charge carriers and electrical relaxation processes.

No abstract

Present work depicts the progress of cadmium oxide (CdO)‐polyaniline composites synthesized by chemical oxidative technique. The composites with change in CdO composition are subjected to structural, electrical, dielectric, and morphology using X‐ray diffraction, AC conductivity, and scanning electron microscopy. The thermogravimetric analysis carried out to study the thermal stability, which shows that the composite with highest CdO concentration displays better stability. The electrical conductivity of the modified polyaniline tends to change with change in the frequency indicating hopping of charge carriers as a dominant mechanism. The variation of dielectric constant of all modified polyaniline with respect to the frequency is analyzed at room temperature. The dielectric constant is found to increase with the decrease in CdO concentration and is found to highest for composite with 2% CdO.