Dielectric properties of conducting polyaniline films by THz time-domain spectroscopy |
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Authors: | E Nguema JL Miane |
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Institution: | a Centre de Physique Moléculaire Optique et Hertzienne, UMR CNRS 5798, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence Cedex, France b Laboratoire de Physique et des Interactions Ondes Matière (PIOM), 16 Avenue Pey Berland, 33607 Pessac Cedex, France |
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Abstract: | The dielectric function of composite polyaniline (PANI)/polyurethane (PU) is studied in the terahertz range. Different free-standing films of composite PANI-CSA/PU with different PANI concentrations are measured by terahertz time-domain spectroscopy (THz-TDS). The Fourier transmission spectrum, the permittivity and conductivity are then precisely obtained between 0.1 and 4 THz. The behaviour of the dielectric function does not follow Drude theory and the extracted data are well fitted by Jonscher’s universal dielectric response. Furthermore, the percolation threshold is also deduced from the insulating to conducting transition extracted for several doping level at very high frequency. |
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Keywords: | Terahertz Spectroscopy Permittivity Conducting polymer Polyaniline Jonscher&rsquo universal dielectric response |
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