High dielectric thin films based on barium titanate and cellulose nanofibrils

A series of composite films based on tetragonal barium titanate (BTO) and cellulose nanofibrils (CNF) with high dielectric constant are prepared using a casting method in aqueous solution. No organic solvent is involved during the preparation, which demonstrates the environmental friendliness of the...

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Bibliographic Details
Published in:RSC advances 2020-02, Vol.10 (10), p.5758-5765
Main Authors: Tao, Jie, Cao, Shun-An, Feng, Rui, Deng, Yulin
Format: Article
Language:English
Subjects:
Aqueous solutions
Barium titanates
Cellulose
Chemistry
Die casting
Dielectric properties
Energy storage
Nanoparticles
Permittivity
Stress concentration
Thermal stability
Thin films
Twisting
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Summary:A series of composite films based on tetragonal barium titanate (BTO) and cellulose nanofibrils (CNF) with high dielectric constant are prepared using a casting method in aqueous solution. No organic solvent is involved during the preparation, which demonstrates the environmental friendliness of the novel material. With less than 30 wt% of filler loading, the excellent distribution of BTO nanoparticles within the CNF matrix is revealed by the FE-SEM images. The dielectric constant of the CNF/BTO (30 wt%) composite film reaches up to 188.03, which is about seven times higher than that of pure CNF (25.24), while the loss tangent only rises slightly from 0.70 to 1.21 (at 1 kHz). The thin films kept their dielectric properties on an acceptable level after repeatedly twisting or rolling 10 times. The improvement of thermal stability is observed with the presence of BTO. The outstanding dielectric properties of the CNF/BTO composite film indicates its great potential to be utilized in energy storage applications.
ISSN:2046-2069
2046-2069
DOI:10.1039/c9ra10916a