Improved dielectric properties of Ag@TiO2/PVDF nanocomposites induced by interfacial polarization and modifiers with different carbon chain lengths

Chen, Xizi; Liang, Fei; Lü, Wenzhong; Zhao, Yifei; Fan, Guifen; Wang, Xiaochuan

doi:10.1063/1.5025382

Cited by 24 publications

(16 citation statements)

References 20 publications

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“…Unfortunately, the ε′ values of the TiO 2 /polymer composites are still significantly low owing to the low ε’ of the TiO 2 nanoparticles. Polymer composites filled with modified TiO 2 nanoparticles such as Ag-TiO 2 hybrid particles and Ag@TiO 2 core–shell structures were developed to enhance ε′ [ 34 , 35 , 36 , 37 ]. Although these composites can exhibit high ε′ values of ~60–150, large tanδ values are generally obtained (~0.1–1) at high filler concentrations (70 vol%) [ 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

“…Polymer composites filled with modified TiO 2 nanoparticles such as Ag-TiO 2 hybrid particles and Ag@TiO 2 core–shell structures were developed to enhance ε′ [ 34 , 35 , 36 , 37 ]. Although these composites can exhibit high ε′ values of ~60–150, large tanδ values are generally obtained (~0.1–1) at high filler concentrations (70 vol%) [ 34 , 35 ]. Among various metal nanoparticles, gold nanoparticles are widely used as fillers to improve the insulation properties of polymer materials because they are nontoxic and less likely to be oxidized [ 38 ].…”

Section: Introductionmentioning

confidence: 99%

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Gold-Nanoparticle-Deposited TiO2 Nanorod/Poly(Vinylidene Fluoride) Composites with Enhanced Dielectric Performance

et al. 2021

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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 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 ~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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gold-Nanoparticle-Deposited TiO2 Nanorod/Poly(Vinylidene Fluoride) Composites with Enhanced Dielectric Performance

et al. 2021

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“…At f Ag −INTO = 0.5, the σ ac value at 1 kHz was only 2.13 × 10 −9 S/cm at 1 kHz. This is much lower than that of other three-phase composite systems, which is usually >10 −7 S/cm [ 25 , 34 ]. Thus, it is clearly confirmed that no conducting pathway was formed.…”

Section: Resultsmentioning

confidence: 77%

“…The enhanced conductivity and tanδ due to incorporation with conductive particles can be inhibited by the discrete growth of metal particles on the surface of ceramic particles. Many previous works showed that a significantly enhanced ε′ and low tanδ of these three-phase composites are achieved [ 3 , 26 , 30 , 31 , 32 , 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Significantly Enhanced Dielectric Properties of Ag-Deposited (In1/2Nb1/2)0.1Ti0.9O2/PVDF Polymer Composites

et al. 2021

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The enhanced dielectric permittivity (ε′) while retaining a low loss tangent (tanδ) in silver nanoparticle−(In1/2Nb1/2)0.1Ti0.9O2/poly(vinylidene fluoride) (Ag-INTO/PVDF) composites with different volume fractions of a filler (fAg-INTO) was investigated. The hybrid particles were fabricated by coating Ag nanoparticles onto the surface of INTO particles, as confirmed by X-ray diffraction. The ε′ of the Ag−INTO/PVDF composites could be significantly enhanced to ~86 at 1 kHz with a low tanδ of ~0.044. The enhanced ε′ value was approximately >8-fold higher than that of the pure PVDF polymer for the composite with fAg-INTO = 0.5. Furthermore, ε′ was nearly independent of frequency in the range of 102–106 Hz. Therefore, filling Ag−INTO hybrid particles into a PVDF matrix is an effective way to increase ε′ while retaining a low tanδ of polymer composites. The effective medium percolation theory model can be used to fit the experimental ε′ values with various fAg-INTO values. The greatly increased ε′ primarily originated from interfacial polarization at the conducting Ag nanoparticle–PVDF and Ag–INTO interfaces, and it was partially contributed by the high ε′ of INTO particles. A low tanδ was obtained because the formation of the conducting network in the polymer was inhibited by preventing the direct contact of Ag nanoparticles.

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“…To meet the developing trends of miniaturization and integration of electronic systems, various different fillers have been embedded in polymers [5]. Among the various structures for fillers, a filler with a core-shell structure has attracted considerable interest, owing to its combination of favorable core and shell properties [6,7,8].…”

Section: Introductionmentioning

confidence: 99%

High Permittivity Nanocomposites Embedded with Ag/TiO2 Core–Shell Nanoparticles Modified by Phosphonic Acid

et al. 2018

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In this paper, nanocomposites that contain core-shell Ag/TiO 2 particles as the filler and polytetrafluoroethylene (PTFE) as the matrix were investigated. Two surfactants, namely octyl phosphonic acid (OPA) and pentafluorobenzyl phosphonic acid (PFBPA), were applied to modify Ag/TiO 2 fillers for uniform dispersion in the matrix. Fourier transform infrared spectroscopy analysis of bonds between the TiO 2 shells and the phosphonic modifiers shows Ti–O–P chemical bonding between the Ag/TiO 2 fillers and the modifiers. Thermogravimetric analysis results show a superior adsorption effect of PFBPA over OPA on the Ag/TiO 2 filler surface at the same weight percentage. For nanocomposites that contain modified Ag/TiO 2 nanoparticles, the loss was reduced despite the high permittivity at the same loading. The permittivity of the nanocomposites by PFBPA is larger than that of OPA, because the more uniform dispersion of inorganic particles in the PTFE matrix enhances the interfacial polarization effect. The mechanism of enhanced dielectric performance was studied and discussed.

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Improved dielectric properties of Ag@TiO2/PVDF nanocomposites induced by interfacial polarization and modifiers with different carbon chain lengths

Cited by 24 publications

References 20 publications

Gold-Nanoparticle-Deposited TiO2 Nanorod/Poly(Vinylidene Fluoride) Composites with Enhanced Dielectric Performance

Gold-Nanoparticle-Deposited TiO2 Nanorod/Poly(Vinylidene Fluoride) Composites with Enhanced Dielectric Performance

Significantly Enhanced Dielectric Properties of Ag-Deposited (In1/2Nb1/2)0.1Ti0.9O2/PVDF Polymer Composites

High Permittivity Nanocomposites Embedded with Ag/TiO2 Core–Shell Nanoparticles Modified by Phosphonic Acid

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