TEMPO-oxidized cellulose nanofibre (TOCN) films and composites with PVOH as sensitive dielectrics for microwave humidity sensing

Ayissi Eyebe, G. F. V., Bideau, B., Loranger, É et Domingue, F. (2019). TEMPO-oxidized cellulose nanofibre (TOCN) films and composites with PVOH as sensitive dielectrics for microwave humidity sensing. Sensors and Actuators B: Chemical, 291 . pp. 385-393. ISSN 0925-4005 DOI 10.1016/j.snb.2019.04.070

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Résumé

This paper investigates TEMPO oxidized cellulose nanofibers (so-called TOCN)films as sensitive dielectrics for humidity detection in microwave frequencies. TOCN is used either as a sensitive material or as a host-matrix enclosing polyvinyl alcohol (PVOH)to achieve highly sensitive humidity sensing. A resonator in coplanar waveguide grounded (CPWG)technology was designed and fabricated. TOCN and TOCN/PVOH gels were dropped in the area of the resonator where the analysis showed the electromagnetic field to be maximum at the resonance. Gels became thin films after drying. Experimental humidity tests were then conducted within the 21.9–89.3%RH range, using the resonant frequency and the transmission phase as measurement variables. The best sensitivity with TOCN was 2.67 MHz/%RH regarding the resonant frequency, and 0.523°/%RH regarding the transmission phase. The effects of PVOH were visible starting from 55%RH, where the sensitivity was raised to 6.000 MHz/%RH and 0.785°/%RH respectively. © 2019 Elsevier B.V.

Type de document:	Article
Mots-clés libres:	grounded coplanar waveguide technology (CPWG) microwave humidity sensing poly-vinyl alcohol (PVOH) TEMPO oxidized cellulose nanofibers (TOCN) cellulose cellulose films cellulose nanocrystals chemical sensors coplanar waveguides electromagnetic fields gels humidity sensors nanocellulose nanofibers natural frequencies oxidation resonators thin films transmissions grounded coplanar waveguides humidity detection humidity sensing oxidized cellulose polyvinyl alcohol (PVOH) sensitive materials TEMPO-oxidized cellulose nanofibers transmission phase nanocomposite films dielectrics humidity
Date de dépôt:	15 juill. 2021 19:28
Dernière modification:	16 juill. 2021 04:00
Version du document déposé:	Post-print (version corrigée et acceptée)
URI:	https://depot-e.uqtr.ca/id/eprint/9648

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