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Gold-Nanoparticle-Deposited TiO2 Nanorod/Poly(Vinylidene Fluoride) Composites with Enhanced Dielectric Performance
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Document Title
Gold-Nanoparticle-Deposited TiO2 Nanorod/Poly(Vinylidene Fluoride) Composites with Enhanced Dielectric Performance
Author
Kum-onsa P, Chanlek N, Manyam J, Thongbai P, Harnchana V, Phromviyo N, Chindaprasirt P
Name from Authors Collection
Affiliations
Khon Kaen University; National Science & Technology Development Agency - Thailand; Khon Kaen University; Khon Kaen University; Khon Kaen University
Type
Article
Source Title
POLYMERS
Year
2021
Volume
13
Issue
1
Open Access
gold, Green Published
Publisher
MDPI
DOI
10.3390/polym13132064
Format
Abstract
Flexible dielectric polymer composites have been of great interest as embedded capacitor materials in the electronic industry. However, a polymer composite has a low relative dielectric permittivity (epsilon' 0.1). In this study, we fabricate a novel, high-permittivity polymer nanocomposite system with a low tan delta. The nanocomposite system comprises poly(vinylidene fluoride) (PVDF) co-filled with Au nanoparticles and semiconducting TiO2 nanorods (TNRs) that contain Ti3+ ions. To homogeneously disperse the conductive Au phase, the TNR surface was decorated with Au-NPs similar to 10-20 nm in size (Au-TNRs) using a modified Turkevich method. The polar beta-PVDF phase was enhanced by the incorporation of the Au nanoparticles, partially contributing to the enhanced epsilon' value. The introduction of the Au-TNRs in the PVDF matrix provided three-phase Au-TNR/PVDF nanocomposites with excellent dielectric properties (i.e., high epsilon' approximate to 157 and low tan delta approximate to 0.05 at 1.8 vol% of Au and 47.4 vol% of TNRs). The epsilon' of the three-phase Au-TNR/PVDF composite is similar to 2.4-times higher than that of the two-phase TNR/PVDF composite, clearly highlighting the primary contribution of the Au nanoparticles at similar filler loadings. The volume fraction dependence of epsilon' is in close agreement with the effective medium percolation theory model. The significant enhancement in epsilon' was primarily caused by interfacial polarization at the PVDF-conducting Au nanoparticle and PVDF-semiconducting TNR interfaces, as well as by the induced beta-PVDF phase. A low tan delta was achieved due to the inhibited conducting pathway formed by direct Au nanoparticle contact.
Funding Sponsor
Khon Kaen University [1500147]; Synchrotron Light Research Institute, Khon Kaen University; Thailand Research Fund (TRF) [BRG6180003]; Post-doctoral Program from Research Affairs and Graduate School, Khon Kaen University [60170]; Research Network NANOTEC (RNN) program of the National Nanotechnology Center (NANOTEC), NSTDA, Ministry of Higher Education, Science, Research, and Innovation (MHESI) [P1851882]
License
CC BY
Rights
Authors
Publication Source
WOS