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

    2 Citations (Scopus)

    Abstract

    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
    JournalCellulose
    Volume26
    Issue number5
    DOIs
    Publication statusPublished - 30 Mar 2019
    MoE publication typeNot Eligible

    Fingerprint

    Styrene
    Composite films
    Cellulose
    Cellulose films
    Spectrum analysis
    Polymers
    Composite materials
    poly(3,4-ethylene dioxythiophene)

    Keywords

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

    Cite this

    Unuma, Takeya ; Kobayashi, Omou ; Hamdany, Iffah F.A. ; Kumar, Vinay ; Saarinen, Jarkko J. / Terahertz complex conductivity of nanofibrillar cellulose-PEDOT:PSS composite films. In: Cellulose. 2019 ; Vol. 26, No. 5. pp. 3247-3253.
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    abstract = "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.].",
    keywords = "Charge transport, Composite films, Conducting polymers, Nanofibrillar cellulose, Terahertz spectroscopy",
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    Terahertz complex conductivity of nanofibrillar cellulose-PEDOT:PSS composite films. / Unuma, Takeya; Kobayashi, Omou; Hamdany, Iffah F.A.; Kumar, Vinay; Saarinen, Jarkko J.

    In: Cellulose, Vol. 26, No. 5, 30.03.2019, p. 3247-3253.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Terahertz complex conductivity of nanofibrillar cellulose-PEDOT:PSS composite films

    AU - Unuma, Takeya

    AU - Kobayashi, Omou

    AU - Hamdany, Iffah F.A.

    AU - Kumar, Vinay

    AU - Saarinen, Jarkko J.

    PY - 2019/3/30

    Y1 - 2019/3/30

    N2 - 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.].

    AB - 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.].

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    KW - Composite films

    KW - Conducting polymers

    KW - Nanofibrillar cellulose

    KW - Terahertz spectroscopy

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