Conduction behavior of doped polyaniline under high current density and the performance of an all polymer electromechanical system

Haisheng Xu, V. Bharti, Z. Y. Cheng, Qiming Zhang, Pen Cheng Wang, A. G. MacDiarmid

    Research output: Contribution to journalConference articlepeer-review

    1 Scopus citations

    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 1 Hz to 1MHz). These results demonstrate that polyaniline can be used for many electro-acoustic devices and provide improved performance.

    Original languageEnglish (US)
    Pages (from-to)185-190
    Number of pages6
    JournalMaterials Research Society Symposium - Proceedings
    Volume600
    StatePublished - Dec 3 2000
    EventThe 1999 MRS Fall Meeting- Symposium Electroactive Polymers - Boston, MA, USA
    Duration: Dec 29 1999 → …

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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