Electrically Conductive Thin Films Based on Nanofibrillated Cellulose : Interactions with Water and Applications in Humidity Sensing
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2020-08-12
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en
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12
36437-36448
36437-36448
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ACS applied materials & interfaces, Volume 12, issue 32
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.Description
| openaire: EC/H2020/760876/EU//INNPAPER | openaire: EC/H2020/788489/EU//BioELCell
Keywords
carbon nanotubes, conductive ink, humidity sensing, nanocellulose, quartz crystal microbalance with impedance measurement (QCM-I), viscoelastic properties, water interactions
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Citation
Solin, K, Borghei, M, Sel, O, Orelma, H, Johansson, L S, Perrot, H & Rojas, O J 2020, ' Electrically Conductive Thin Films Based on Nanofibrillated Cellulose : Interactions with Water and Applications in Humidity Sensing ', ACS applied materials & interfaces, vol. 12, no. 32, pp. 36437-36448 . https://doi.org/10.1021/acsami.0c09997