Nanoporous kaolin: Cellulose nanofibril composites for printed electronics

Katariina Torvinen (Corresponding Author), Fredrik Pettersson, Panu Lahtinen, Kai Arstila, Vinay Kumar, Ronald Österbacka, Martti Toivakka, Jarkko J. Saarinen

    Research output: Contribution to journalArticleScientificpeer-review

    10 Citations (Scopus)


    Cellulose nano- and microfibrils (CNF/CMF) grades vary significantly based on the raw materials and process treatments used. In this study four different CNF/CMF grades were combined with kaolin clay pigment particles to form nanoporous composites. The attained composite properties like porosity, surface smoothness, mechanical properties and density properties depended strongly on the raw materials used. In general, higher kaolin content (~80 wt%) led to controllable shrinkage during drying, which resulted in improved dimensional stability of composites, compared to a lower kaolin content (~50 wt%). On the other hand, the use of a plasticizer and a high amount of CNF/CMF was essential to produce adequate elasticity for the composites. The performance of transistors when fabricated on the nanoporous composites was strongly dependent on the raw materials used. The formation of the semiconductor layer was affected by the porosity, roughness, hydrophobicity, polarity and absorption properties of the top-most layer at the composite. The developed natural fiber-based substrates may be applied to novel value-added applications in intelligent products, such as sensors and simple displays.
    Original languageEnglish
    Article number024004
    Number of pages11
    JournalFlexible and Printed Electronics
    Issue number2
    Publication statusPublished - 1 Jun 2017
    MoE publication typeA1 Journal article-refereed


    One of the authors (JJS) wishes to acknowledge financial support by the Academy of Finland (grant no. 250 122, 256 263, 283 054 and 269973) and author KA acknowledges funding from the Finnish Centre of Excellence on Nuclear and Accelerator Based Physics by Academy of Finland (grant no. 251 353).


    • cellulose nanofibrils (CNF)
    • nanocellulose
    • kaolin pigment
    • transistors
    • substrate
    • porosity
    • composite
    • roughness


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