Dielectric Properties of Polythiophene-CoO Composites

Polythiophene has been prepared by oxidation process. Polythiophene-CoO composites were prepared by mechanical mixing of PTh and CoO in different weight percentages. Dielectric properties as a function of temperature from 300K to 425K and frequency in the range from 50Hz to 3MHz have been measured. Dielectric constant decreased with increase in frequency and increased with increase in temperature. Dielectric loss decreased with increase in frequency and increased with increase in temperature. Using dielectric data, ac conductivity has been determined. Conductivity was found to be in the order of 10 -4 (Ω -1 m -1 ) and it increased with increase in temperature. The temperature variation of conductivity has been analyzed using Mott’s polaron hopping model. Activation energy for conduction has been determined. Activation energy was determined to be in the order of meV and it has decreased with increase in frequency and CoO content. Similar results have been reported for polyaniline and cobalt phthalocyanine.