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Electrical and dielectric properties of multiwall carbon nanotube/polyaniline composites

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Abstract

In this paper, electrical and dielectric properties of multiwall carbon nanotubes (MWCNTs)/insulating polyaniline (PANI) composites were studied. A mixture of MWCNTs and insulating polyaniline was dispersed in an ethanol solution by ultrasonic process, subsequently dried, and was hot-pressed at 200 °C under 30 MPa. Electrical and dielectric properties of the composites were measured. The experimental results show that the dc conductivities of the composites exhibit a typical percolation behavior with a low percolation threshold of 5.85 wt.% MWCNTs content. The dielectric constant of the composites increases remarkably with the increasing MWCNTs concentration, when the MWCNTs concentration was close to percolation threshold. This may be attributed to the critical behavior of the dielectric constant near the percolation threshold as well as to the polarization effects between the clusters inside the composites.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (grant no. 50572122).

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Authors and Affiliations

  1. Shijiazhuang Mechanical Engineering College, Shijiazhuang, 050003, People’s Republic of China

    Sui-Lin Shi, Ling-Zhen Zhang & Jun-Shou Li

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  1. Sui-Lin Shi
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  2. Ling-Zhen Zhang
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Correspondence to Sui-Lin Shi.

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Shi, SL., Zhang, LZ. & Li, JS. Electrical and dielectric properties of multiwall carbon nanotube/polyaniline composites. J Polym Res 16, 395–399 (2009). https://doi.org/10.1007/s10965-008-9241-z

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  • DOI: https://doi.org/10.1007/s10965-008-9241-z

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