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25-01-2019 | Original Research | Issue 5/2019

Cellulose 5/2019

Terahertz complex conductivity of nanofibrillar cellulose-PEDOT:PSS composite films

Journal:
Cellulose > Issue 5/2019
Authors:
Takeya Unuma, Omou Kobayashi, Iffah F. A. Hamdany, Vinay Kumar, Jarkko J. Saarinen
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Abstract

We investigate the terahertz transmission through flexible composite films that contain nanofibrillar cellulose (NFC) and different blending percentages of the conductive polymer poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS). The real part of terahertz complex conductivity is found to decrease with decreasing frequency for each NFC composite film and to approach a finite positive value dependent on the PEDOT:PSS blending percentage in the limit of zero frequency. Both the real and imaginary parts of complex conductivity spectra can be fitted simultaneously with an extended Drude model that describes a partially localized nature of carriers. Our spectral analysis indicates that carriers in the NFC composite become denser and also less localized as the PEDOT:PSS blending percentage is increased.

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