Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/115901
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Type: Journal article
Title: Advancing dielectric and ferroelectric properties of piezoelectric polymers by combining graphene and ferroelectric ceramic additives for energy storage applications
Author: Ishaq, S.
Kanwal, F.
Atiq, S.
Moussa, M.
Azhar, U.
Imran, M.
Losic, D.
Citation: Materials, 2018; 11(9):1553-1-1553-16
Publisher: MDPI
Issue Date: 2018
ISSN: 1996-1944
1996-1944
Statement of
Responsibility: 
Saira Ishaq, Farah Kanwal, Shahid Atiq, Mahmoud Moussa, Umar Azhar, Muhammad Imran and Dusan Losic
Abstract: To address the limitations of piezoelectric polymers which have a low dielectric constant andto improve their dielectric and ferroelectric efficiency for energy storage applications, we designed and characterized a new hybrid composite that contains polyvinylidene fluoride as a dielectric polymer matrix combined with graphene platelets as a conductive and barium titanite as ceramic ferroelectric fillers. Different graphene/barium titanate/polyvinylidene fluoride nanocomposite films were synthesized by changing the concentration of graphene and barium titanate to explore the impact of each component and their potential synergetic effect on dielectric and ferroelectric properties of the composite. Results showed that with an increase in the barium titanate fraction, dielectric efficiency ofthe nanocomposite was improved. Among all synthesized nanocomposite films, graphene/barium titanate/polyvinylidene fluoride nanocomposite in the weight ratio of 0.15:0.5:1 exhibited thehighest dielectric constant of 199 at 40 Hz, i.e., 15 fold greater than that of neat polyvinylidene fluoride film at the same frequency, and possessed a low loss tangent of 0.6. However, AC conductivity and ferroelectric properties of graphene/barium titanate/polyvinylidene fluoride nanocomposite films were enhanced with an increase in the graphene weight fraction. Graphene/barium titanate/polyvinylidene fluoride nanocomposite films with a weight ratio of 0.2:0.1:1 possessed a high AC conductivity of 1.2 × 10-4 S/m at 40 Hz. While remanent polarization, coercive field, and loop area of the same sample were 0.9 μC/cm², 9.78 kV/cm, and 24.5 μC/cm²·V, respectively. Our results showed that a combination of graphene and ferroelectric ceramic additives are an excellent approach to significantly advance the performance of dielectric and ferroelectric properties of piezoelectric polymers for broad applications including energy storage.
Keywords: dielectric; ferroelectric; graphene; barium titanate; polyvinylidene fluoride; capacitors
Description: Published: 28 August 2018
Rights: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
RMID: 0030097095
DOI: 10.3390/ma11091553
Grant ID: http://purl.org/au-research/grants/arc/IH150100003
Appears in Collections:Chemical Engineering publications

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