Dielectric Spectroscopy of Polyaniline/Stanic Oxide (PANI/SnO₂) Composites

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.

Keywords:

• Conductivity
• polyaniline composites
• SnO₂