Electrically Conductive Thin Films Based on Nanofibrillated Cellulose: Interactions with Water and Applications in Humidity Sensing

Katariina Solin, Maryam Borghei, Ozlem Sel (Corresponding Author), Hannes Orelma, Leena Sisko Johansson, Hubert Perrot, Orlando J. Rojas (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)

Abstract

TEMPO-oxidized cellulose nanofibrils (TOCNF) and oxidized carbon nanotubes (CNT) were used as humidity-responsive films and evaluated using electroacoustic admittance (quartz crystal microbalance with impedance monitoring, QCM-I) and electrical resistivity. Water uptake and swelling phenomena were investigated in a range of relative humidity (% RH) between 30 and 60% and temperatures between 25 and 50 °C. The presence of CNT endowed fibril networks with high water accessibility, enabling fast and sensitive response to changes in humidity, with mass gains of up to 20%. The TOCNF-based sensors became viscoelastic upon water uptake, as quantified by the Martin-Granstaff model. Sensing elements were supported on glass and paper substrates and confirmed a wide window of operation in terms of cyclic % RH, bending, adhesion, and durability. The electrical resistance of the supported films increased by ∼15% with changes in % RH from 20 to 60%. The proposed system offers a great potential to monitor changes in smart packaging.
Original languageEnglish
Pages (from-to)36437-36448
JournalACS Applied Materials & Interfaces
Volume12
Issue number32
DOIs
Publication statusPublished - 12 Aug 2020
MoE publication typeA1 Journal article-refereed

Funding

This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 760876. This work was a part of the Academy of Finland’s Flagship Programme under projects nos. 318890 and 318891 (Competence Center for Materials Bioeconomy, FinnCERES). K.S. acknowledges funding by the Aalto University School of Chemical Engineering doctoral programme. The authors acknowledge the provision of facilities and technical support by Aalto University at OtaNano—Nanomicroscopy Center (Aalto-NMC). Finally, O.J.R. acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (ERC Advanced Grant Agreement No. 788489, “BioElCell”), the Canada Excellence Research Chair initiative, and the Canada Foundation for Innovation (CFI).

Keywords

  • carbon nanotubes
  • conductive ink
  • humidity sensing
  • nanocellulose
  • quartz crystal microbalance with impedance measurement (QCM-I)
  • viscoelastic properties
  • water interactions

Fingerprint

Dive into the research topics of 'Electrically Conductive Thin Films Based on Nanofibrillated Cellulose: Interactions with Water and Applications in Humidity Sensing'. Together they form a unique fingerprint.

Cite this