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Effect of dopants and morphology on the electrical properties of polyaniline for various applications

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Abstract

The tunable electrical conductivity in the conducting polymer is one of the significant advantages for focusing on these materials for flexible electronics and electrical applications. In this work, the polyaniline electrical conductivity is tuned by doping with different dopant materials, varying doping concentrations, and different morphologies. The experimental electrical conductivity results are correlated with the optical band gaps and their corresponding electronic transitions. Increasing the doping concentration from 0 to 1.0 M HCl increases electrical conductivity from 1.98 to 10.2 Scm−1. The observed five-fold increment is attributed to the increase in polarons in the polymer chain with doping. The polyaniline electrical conductivity is also tuned by making different morphologies. The measured electrical conductivity is larger for the polyaniline nanowhisker and nanofiber (~ 2 Scm−1) samples than the sample with highly entangled polymer chains (0.26 Scm−1). Moreover, it was found that the polyaniline nanofibers with ordered polymer chains show larger electrical conductivity (1.75 and 1.27 Scm−1) as compared with the disordered polymer chains (0.22 Scm−1).

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Acknowledgements

R. Lenin thanks DST-SERB for the financial support in the form of a National Postdoctoral

Fellowship (N-PDF) (File No: PDF/2018/003583).

Funding

DST-SERB in the form of a National Postdoctoral Fellowship (N-PDF) (File No: PDF/2018/003583).

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Authors and Affiliations

  1. Institute of Nano Science and Technology, Knowledge City, Sector-81, S.A.S Nagar, Mohali, Punjab, 140306, India

    Ramanujam Lenin, Ajit Singh & Chandan Bera

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  1. Ramanujam Lenin
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  2. Ajit Singh
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Correspondence to Ramanujam Lenin.

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Lenin, R., Singh, A. & Bera, C. Effect of dopants and morphology on the electrical properties of polyaniline for various applications. J Mater Sci: Mater Electron 32, 24710–24725 (2021). https://doi.org/10.1007/s10854-021-06883-6

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  • DOI: https://doi.org/10.1007/s10854-021-06883-6

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