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Published in: Cellulose 5/2021

01-02-2021 | Original Research

High dielectric thin films based on UV-reduced graphene oxide and TEMPO-oxidized cellulose nanofibres

Authors: Yasir Beeran Pottathara, Vid Bobnar, Yves Grohens, Sabu Thomas, Rupert Kargl, Vanja Kokol

Published in: Cellulose | Issue 5/2021

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Abstract

The dielectric response of thin, flexible films, prepared from graphene oxide (GO) and 2,2,6,6-tetramethylpiperidin-1-yloxyl (TEMPO) oxidized cellulose nanofibres (TCNF) is studied using the solution casting method, and further subjected to the UV irradiation treatment under nitrogen atmosphere for GO reduction. The reduction of GO and its interactions with TCNF has been proven by ATR-FTIR, FESEM, UV–Vis, Raman, and XRD spectroscopy measurements. The film’s improved storage modules and deformability by temperature are demonstrated by dynamic mechanical analysis. The dielectric constant of the TCGO-3 (contains 3 wt.% GO) composite film reaches up to 74.05, whereas its 5 h UV treated counterpart even up to 119.2 at a high frequency of 1 MHz. The ac conductivity of the latter film sample reaches ~ 0.0053 Sm− 1. These outstanding dielectric responses of such films indicate their potential to be utilized in energy storage devices, as well as demonstrating their preparation in an environmentally friendly way.

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Metadata
Title
High dielectric thin films based on UV-reduced graphene oxide and TEMPO-oxidized cellulose nanofibres
Authors
Yasir Beeran Pottathara
Vid Bobnar
Yves Grohens
Sabu Thomas
Rupert Kargl
Vanja Kokol
Publication date
01-02-2021
Publisher
Springer Netherlands
Published in
Cellulose / Issue 5/2021
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI
https://doi.org/10.1007/s10570-021-03701-4

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