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Conduction Behavior of Doped Polyaniline Under High Current Density and the Performance of an all Polymer Electromechanical System

Published online by Cambridge University Press:  10 February 2011

Haisheng Xu ,
V. Bharti ,
Z.-Y. Cheng  and
Q. M. Zhang
Haisheng Xu
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802; Pen-Cheng Wang, A. G. MacDiarmid, Chemistry Department, University of Pennsylvania, Philadelphia, PA 19104
V. Bharti
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802; Pen-Cheng Wang, A. G. MacDiarmid, Chemistry Department, University of Pennsylvania, Philadelphia, PA 19104
Z.-Y. Cheng
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802; Pen-Cheng Wang, A. G. MacDiarmid, Chemistry Department, University of Pennsylvania, Philadelphia, PA 19104
Q. M. Zhang
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802; Pen-Cheng Wang, A. G. MacDiarmid, Chemistry Department, University of Pennsylvania, Philadelphia, PA 19104
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Abstract

In many device applications, such as electro-acoustic transducers and actuators based on high strain electroactive polymers, there are many advantages to utilize conductive polymers as electrodes. However, in these applications, a high electric power usually is required which translates to high voltage and high current in the system. Hence, the maximum current density which a conducting polymer can carry is of great interest and importance. In this paper, the conduction behavior at high current density of doped polyaniline(PANI) is reported. It was found that the current density deviates strongly from the ohmic relation with the electric field in high current density region and a saturation of the current density was observed. The maximum current density Jm observed is proportional to the conductivity of the samples and for PANI doped with HCSA, Jm can reach as high as 1200 A/cm2. Making use of the conducting polymer as the electrodes for the electrostrictive P(VDF-TrFE) copolymer, an all-polymer electromechanical system was fabricated. The all-polymer films exhibit similar or larger electric field induced strain responses than those from films with gold electrodes, presumably due to reduced mechanical clamping from the electrodes. In addition, the all-polymer system also exhibits comparable dielectric and polarization properties to those of gold-electroded P(VDF-TrFE) films in a wide temperature (from −50°C to 120°C) and frequency range (from 1Hz to 1MHz). These results demonstrate that polyaniline can be used for many electro-acoustic devices and provide improved performance.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 600: Symposium FF – Electroactive Polymers , 1999 , 185
Copyright
Copyright © Materials Research Society 2000

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