Article Dans Une Revue RSC Advances Année : 2016

Mechanically strong, flexible and thermally stable graphene oxide/nanocellulosic films with enhanced dielectric properties

Résumé

Flexible and eco-friendly films, with enhanced dielectric properties and the potential for energy storage applications, have been fabricated from ammonia-functionalized graphene oxide (NGO) nanoplatelets and wood-based cellulose nanofibrils (CNF) vs. (2,2,6,6-tetramethylpiperidin-1-yl) oxyl (TEMPO) preoxidized (carboxylated) CNFs (TCNF) by the solvent casting method. Various CNF-NGO (CNG) and TCNF-NGO (TCNG) composite films prepared with 0.5-3 wt% of NGO were analysed structurally by FTIR and XRD spectroscopy, and evaluated optically by UV-Vis spectroscopy. The morphological analysis using SEM showed good dispersibility of the NGO sheets in the randomly-distributed CNF, and the dense and parallel-oriented TCNF cellulose nanofibrils. Such a synergistic effect of both components contributed to ultra-strong and ultra-stiff composite films with good mechanical and thermal stability, although they were more brittle with a smoother surface and lower transmittance for the TCNF based films, due to the stronger physico-chemical interactions with NGO. The dielectric performance was verified with a higher (3 wt%) NGO loading capacity, which resulted in a dielectric constant of similar to 46 vs. similar to 52, and conductivity of similar to 2.07 x 10(-4) S m(-1) vs. 3.46 x 10(-4) S m(-1) for CNG vs. TCNG films, respectively, at a frequency of 1 MHz, showing greater enhancement than other reported studies. Cyclic voltammetry and electrochemical impedance studies reveal the energy storage ability and electrochemical performance of the composite films, under kinetic-and diffusion-controlled processes for the CNG, and under a kinetic-controlled process for the TCNG films.

Dates et versions

hal-05127451 , version 1 (24-06-2025)

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Citer

Yasir P. T. Beeran, Vid Bobnar, Selestina Gorgieva, Yves Grohens, Matjaz Finsgar, et al.. Mechanically strong, flexible and thermally stable graphene oxide/nanocellulosic films with enhanced dielectric properties. RSC Advances, 2016, 6 (54), pp.49138-49149. ⟨10.1039/c6ra06744a⟩. ⟨hal-05127451⟩
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