Abstract
Conducting polyaniline/Stanic oxide (PANI/SnO 2 ) composites have been synthesized by insitu deposition technique by placing fine graded SnO 2 in polymerization mixture of aniline. The PANI/SnO 2 composites have been synthesized with various compositions viz., 10, 20, 30, 40 and 50 wt % of SnO 2 in PANI. The ac conductivity was studied in the frequency range 10 2 –10 6 Hz. It is observed from the ac conductivity studies that the ac conductivity is found to be constant up to 10 5 Hz and thereafter it increases steeply which is a characteristic feature of disordered materials. The dielectric behaviour was also investigated in the frequency range 10 2 –10 6 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 δ values decreases upto 30 wt % and then increases thereafter. At higher frequencies these composites exhibit almost zero dielectric loss. The dimensions of SnO 2 particles in the matrix have a greater influence on the conductivity values and the observed dielectric values.
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