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Vapor and Pressure Sensors Based on Cellulose Nanofibers and Carbon Nanotubes Aerogel with Thermoelectric Properties

Rajendran Muthuraj, Abhishek Sachan, Mickael Castro*, Jean-François Feller, Bastien Seantier*, Yves Grohens
Dupuy de Lôme Research Institute (IRDL), FRE CNRS 3744, University of Southern Brittany, Rue de Saint Maudé, 56321 Lorient Cedex, France
*Corresponding authors: ; mickael.

Journal of Renewable Materials 2018, 6(3), 277-287. https://doi.org/10.7569/JRM.2017.634182

Abstract

In this work, thermally insulating and electrically conductive aerogels were prepared from cellulose nanofibers (CNF) and carbon nanotubes (CNTs) by environmentally friendly freeze-drying process. The thermal conductivity of neat CNF aerogel is 24 mW/(m·K) with a density of 0.025 g/cm3. With the addition of CNTs into CNF aerogel, the electrical conductivity was significantly increased while the thermal conductivity was increased to 38 mW/(m·K). Due to these interesting properties, the Seebeck coefficient and the figure of merit (ZT) of the CNF/CNTs aerogels were measured and showed that CNF/CNTs aerogel thermoelectric properties can be improved. The compressibility and electrical resistance of the CNF/CNTs aerogel highlighted its pressure-responsive property. A set of volatile organic compounds (VOCs) were exposed to aerogels to monitor the resistance change. The CNF/CNTs aerogel showed high sensitivity and good response to both nonpolar and polar vapors due to the absorption by both CNF and CNTs networks. The prepared CNF/CNTs aerogel is therefore a good candidate for thermal insulation, thermoelectric material, VOCs sensing, and pressure-sensing applications.

Keywords

CNF/CNTs aerogel, thermal conductivity, pressure sensing, thermoelectric materials, VOCs sensing

Cite This Article

Muthuraj,, R. (2018). Vapor and Pressure Sensors Based on Cellulose Nanofibers and Carbon Nanotubes Aerogel with Thermoelectric Properties. Journal of Renewable Materials, 6(3), 277–287.



This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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