Dielectric spectroscopy of polyaniline/stanic oxide (PANI/SnO2) composites

Abstract

Conducting polyaniline/Stanic oxide (PANI/SnO2) composites have been synthesized by insitu deposition technique by placing fine graded SnO 2 in polymerization mixture of aniline. The PANI/SnO2 composites have been synthesized with various compositions viz., 10, 20, 30, 40 and 50 wt % of SnO2 in PANI. The ac conductivity was studied in the frequency range 102-106 Hz. It is observed from the ac conductivity studies that the ac conductivity is found to be constant up to 105 Hz and thereafter it increases steeply which is a characteristic feature of disordered materials. The dielectric behaviour was also investigated in the frequency range 102-106 Hz. It is observed that initially the values of dielectric constant decreases up to 30 wt % and later it increases. It is seen that the tan values decreases upto 30 wt % and then increases thereafter. At higher frequencies these composites exhibit almost zero dielectric loss. The dimensions of SnO2 particles in the matrix have a greater influence on the conductivity values and the observed dielectric values.