Piezoresistivity of conducting polyaniline/BaTiO3 composites

Conducting polyaniline/barium titanate (PANI/BaTiO3) composites exhibiting piezoresistivity properties have been synthesized by the in situ deposition technique by placing a fine grade powder of BaTiO3 in the polymerization r eaction mixture. The polyaniline was formed preferentially on the ceramic p articles giving a much higher yield for PANI than in absence of the BaTiO3 These composites exhibited piezoresistivity with the piezosensitivity being maximum at a certain composition. The current-voltage characteristics clea rly revealed a nonlinear space charge controlled charge transport process. A large hysteresis in these characteristics was also observed which was dep endent on the BaTiO3 content in a composite. The various results have been explained on the basis of the charge transport mechanism in the heterogeneo us conducting material having insulating domains dispersed in it.