Abstract
Using terahertz time-domain spectroscopy, the frequency-dependent conductivities of polyaniline emeraldine salt-polyethylene (PAni-PE) pellets were measured at different mass concentrations. THz conductivities were compared to the behavior of DC conductivities measured using impedance spectroscopy. The DC conductivity behavior with mass concentration showed a low percolation threshold. The frequency-dependent behavior in the THz region follows the Mott-Davis behavior which shows stronger correlation at higher PAni concentration. At the same time, the conductivity increases exponentially with increasing PAni concentration over the frequency range studied without an apparent percolation threshold. The mechanisms in the two regions studied suggest that there is more dominant localization in the THz regime in contrast with a more dominant percolative transport in the Hz-MHz region. Temperature-dependent measurements showed a decreasing value of parameter S with increasing temperature consistent with a correlated barrier hopping model. Lastly, the parameter S increases in magnitude with a decreasing amount of PAni in the composites reflective of varying conducting and nonconducting compositions.
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Acknowledgments
AKGT would like to thank the Hitachi Scholarship Foundation for the support. Also, the authors extend their gratitude to Prof. Tomoyuki Mochida of Kobe University for the impedance analyzer.
Funding
This work was financially supported by the Hitachi Scholarship Foundation and partially supported by the Bilateral Joint Research Project (FY 2018-2019) funded by the Japan Society for the Promotion of Science and the Department of Science and Technology, Philippines.
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Tapia, A.K.G., Tominaga, K. Temperature Dependence of THz Conductivity in Polyaniline Emeraldine Salt-Polyethylene Pellets. J Infrared Milli Terahz Waves 41, 258–264 (2020). https://doi.org/10.1007/s10762-019-00650-9
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DOI: https://doi.org/10.1007/s10762-019-00650-9