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Piezoresistivity of conducting polyaniline/BaTiO3 composites

Published online by Cambridge University Press:  31 January 2011

R. C. Patil ,
S. Radhakrishnan ,
Sushama Pethkar  and
K. Vijaymohanan
R. C. Patil
Affiliation:
Polymer Science and Engineering Group, National Chemical Laboratory, Pune 411 008, India
S. Radhakrishnan*
Affiliation:
Polymer Science and Engineering Group, National Chemical Laboratory, Pune 411 008, India
Sushama Pethkar
Affiliation:
Physical Chemistry Division, National Chemical Laboratory, Pune 411 008, India
K. Vijaymohanan
Affiliation:
Physical Chemistry Division, National Chemical Laboratory, Pune 411 008, India
*
a)Address all correspondence to this author.
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Abstract

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 reaction mixture. The polyaniline was formed preferentially on the ceramic particles 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 clearly revealed a nonlinear space charge controlled charge transport process. A large hysteresis in these characteristics was also observed which was dependent on the BaTiO3 content in a composite. The various results have been explained on the basis of the charge transport mechanism in the heterogeneous conducting material having insulating domains dispersed in it.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 7 , July 2001 , pp. 1982 - 1988
Copyright
Copyright © Materials Research Society 2001

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