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Gold‐nanoparticle‐deposited TiO2 nanorod/poly(Vinylidene fluoride) composites with enhanced dielectric performance
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Metadata
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
Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand; Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima, 30000, Thailand; Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand; Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand; Institute of Nanomaterials Research and Innovation for Energy (IN‐RIE), NANOTEC‐KKU RNN on Nanomaterials Research and Innovation for Energy, Khon Kaen University, Khon Kaen, 40002, Thailand; Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, 40002, Thailand
Type
Article
Source Title
Polymers
ISSN
20734360
Year
2021
Volume
13
Issue
13
Open Access
Gold, Green
Publisher
MDPI AG
DOI
10.3390/polym13132064
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 (ε′ < 100), while its dielectric loss tangent is generally large (tanδ > 0.1). In this study, we fabricate a novel, high‐permittivity polymer nanocomposite system with a low tanδ. The nano-composite 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 ~10–20 nm in size (Au‐TNRs) using a modified Turkevich method. The polar β‐PVDF phase was enhanced by the incorporation of the Au nanoparticles, partially contributing to the enhanced ε′ 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 ε′ ≈ 157 and low tanδ ≈ 0.05 at 1.8 vol% of Au and 47.4 vol% of TNRs). The ε′ of the three‐phase Au‐TNR/PVDF composite is ~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 ε′ is in close agreement with the effective medium percolation theory model. The significant enhancement in ε′ was primarily caused by interfacial polarization at the PVDF–conducting Au nanoparticle and PVDF–semiconducting TNR interfaces, as well as by the induced β‐PVDF phase. A low tanδ was achieved due to the inhibited conducting pathway formed by direct Au nanoparticle contact. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Funding Sponsor
Khon Kaen University; National Science and Technology Development Agency; Thailand Research Fund; School of Aerospace Science and Technology; National Nanotechnology Center; Synchrotron Light Research Institute; Ministry of Higher Education, Science, Research and Innovation, Thailand
License
CC BY
Rights
Author
Publication Source
Scopus