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

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...

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Bibliographic Details
Published inCellulose (London) Vol. 26; no. 5; pp. 3247 - 3253
Main Authors Unuma, Takeya, Kobayashi, Omou, Hamdany, Iffah F. A., Kumar, Vinay, Saarinen, Jarkko J.
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 30.03.2019
Springer Nature B.V
Subjects
Bioorganic Chemistry
Blending
Cellulose
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Conductivity
Glass
Natural Materials
Organic Chemistry
Original Research
Physical Chemistry
Polymer Sciences
Polystyrene resins
Sustainable Development
Nanofibrillar cellulose
Conducting polymers
Terahertz spectroscopy
Charge transport
Composite films
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Summary: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. Graphical abstract
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-019-02276-5