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

Takeya Unuma, Omou Kobayashi, Iffah F.A. Hamdany, Vinay Kumar, Jarkko J. Saarinen

    Research output: Contribution to journalArticleScientificpeer-review

    16 Citations (Scopus)


    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. Graphical abstract: [Figure not available: see fulltext.].

    Original languageEnglish
    Pages (from-to)3247-3253
    Number of pages7
    Issue number5
    Publication statusPublished - 30 Mar 2019
    MoE publication typeA1 Journal article-refereed


    • Charge transport
    • Composite films
    • Conducting polymers
    • Nanofibrillar cellulose
    • Terahertz spectroscopy


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