Synergy improvement of dielectric properties and thermal conductivity in PVDF composites with core‐shell structured Ni@SiO2

Li, Ting; Zhou, Wenying; Liu, Ying; Cao, Dan; Wang, Yun; Cao, Guozheng; Liu, Xiangrong; Cai, Huiwu; Dang, Zhi‐Min

doi:10.1007/s10854-020-05149-x

Cited by 19 publications

(12 citation statements)

References 48 publications

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“…For multicomponent polymer composites, the heat propagation path depends not only on the connection and distribution of the fillers but also on the number of defects and voids in the boundary region between different phases. , For calcined whisker/PVDF, the formation of the SiO 2 shell improves the TC of the nanocomposites. This is explained by the fact that the shell of SiO 2 contains some hydroxyl groups that can form hydrogen bonds with the F atoms in PVDF, thereby enhancing the interface adhesion and interfacial compatibility between whisker-0 and the PVDF matrix through reducing interface defects.…”

Section: Resultsmentioning

confidence: 99%

Insights into Synchronously Enhanced Dielectric Properties and Thermal Conductivity of β-SiC_w/PVDF Nanocomposites by Building a Crystalline SiO₂ Shell as an Interlayer

Cao

Zhou

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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Polymeric nanocomposites possessing high dielectric constant (k) without an unacceptably large increase in dielectric loss (k″) and excellent thermal conductivity (TC) are extremely desirable in microelectronics. In this study, a crystalline SiO 2 shell (silicon dioxide shell) was constructed on the surface of β-silicon carbide whiskers (β-SiC w , denoted as whisker-0) under air by high-temperature oxidation, and the obtained core−shellstructured β-SiC w @SiO 2 whiskers (denoted as calcined whiskers) were composited with poly(vinylidene fluoride) (PVDF) to deliberately generate morphology-controllable high-k, low-loss, and high-TC nanocomposites. The results show that the calcined whisker/PVDF nanocomposites reveal extremely low k″ and conductivity in comparison to the whisker-0/PVDF analogues because the insulating SiO 2 interlayer prevents direct contact among whisker-0 and therefore remarkably suppresses the long-range charge migration. In particular, both the loss and conductivity tend to regularly reduce with increasing thickness of the SiO 2 shell while maintaining a high k. Simultaneously, the constructed crystalline SiO 2 interlayer compatibilizes the whisker-0 filler with the PVDF matrix via hydrogen bonding while restraining the interfacial thermal resistance and facilitating phonon transport at interfaces, resulting in increased TC of the nanocomposites compared to amorphous SiO 2 -encapsulated whisker-0 counterparts. 50 wt % calcined whisker/PVDF nanocomposites have rather good dielectric performances such as a very low k″ of 0.08 (100 Hz) and a greatly improved TC of 2.41 W/m K, compared with 1957 and 2.1 W/m K for 50 wt % whisker-0/PVDF nanocomposites, respectively. The synchronous enhancement in both dielectric properties and TC makes the nanodielectrics show appealing prospective applications in microelectronic and electrical industries.

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Section: Resultsmentioning

confidence: 99%

Insights into Synchronously Enhanced Dielectric Properties and Thermal Conductivity of β-SiC_w/PVDF Nanocomposites by Building a Crystalline SiO₂ Shell as an Interlayer

Cao

Zhou

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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“…Obviously, the ε is seen to increase with raising filler concentration for the composites with Ni and Ni@NiO, which can be considered as the typical percolating composites with conductive fillers. 1,8,[36][37][38] From Figure 5(a), when the Ni filler concentration is less than 20 wt%, the ε of original Ni/PVDF composites rises almost slightly with the filler concentration until to 48, because a small amount filler particle is insufficient to constitute enough micro capacitor, thereby resulting in unimpressive IP effect. The IP effect also is called as the Maxwell-Wagner-Sillars (MWS) effect, occurring at heterogenous phases with different electric conductivities, resulting in free charges accumulate at the interfaces of different phases.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…Moreover, the Ni@SiO 2 /PVDF still possess a high TC owing to the restrained thermal interfacial resistance and enhanced interfacial compatibility between the fillers and the matrix. 38 Zhu et al prepared Ni@BaTiO 3 particles via a sol-gel method, then fabrication of epoxy composites based on Ni@BaTiO 3 . It is reported that the strong charge accumulation and interfacial polarizations on the huge interfaces, especially the Ni/BaTiO 3 interfaces, give arise to the substantially enhanced ε .…”

Section: Introductionmentioning

confidence: 99%

Towards synchronously improving dielectric performance and thermal conductivity in Ni/PVDF by tailoring core-shell structured Ni@NiO particles

Peng

Zhou

Cao

et al. 2022

High Performance Polymers

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An insulating interlayer between conductive particles and polymer is crucial for preparing polymer dielectrics with high dielectric permittivity ( ε) but low loss and high breakdown strength ( E b). To restrain the large loss of raw nickel (Ni)/poly (vinylidene fluoride) (PVDF) composites when still maintaining a high- ε at the percolation threshold ( f c) of conductive fillers, in this work, nanoscale nickel oxide (NiO) shell with diverse thickness was coated around the surface of Ni particles via a facile thermal calcination at 650°C under air, and the gained Ni@NiO particles were composited with PVDF to produce morphology-controllable high- ε, low loss composites. The influences of the NiO shell and thickness on the dielectric performances and thermal conductivity (TC) of the composites were investigated in terms of filler loading and frequency. Compared with raw Ni/PVDF, the Ni@NiO/PVDF composites exhibit remarkably suppressed dielectric loss and enhanced E b and TC because the NiO interlayer not only prevents the Ni particles from direct contact and hinders the long-range electron migration thereby resulting in rather low leakage current, but also simultaneously suppresses thermal interfacial resistance and enhances interfacial compatibility between the fillers and the matrix subsequently resulting in improved TC. Therefore, the Ni@NiO/PVDF with high ε-low loss, heightened E b and TC present appealing potential applications in microelectronics and electrical industries.

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“…Along this line, to further improve the P or ε r of nanocomposites, nanoscale metal fillers and their oxides (Ag, − Zn, Fe 3 O 4 , , Ni, ,, and so on) might be excellent choices due to the percolation theory, where remarkably enhanced P and ε r values of nanocomposites would be realized at low filling fraction. In addition, owing to the high energy barrier of nanoscale metal fillers, the Coulomb blocking effects in the nanocomposites could prevent a second electron from tunneling and block the path of the leakage currents, leading to an enhanced E b of nanocomposites. ,, For example, Luo et al have reported that the 20 nm Ag NPs grown discretely on the surface of 100 nm BaTiO 3 NPs could effectively suppress the formation of conductive path in nanocomposites .…”

Section: Introductionmentioning

confidence: 99%

“…3,24−26 Therefore, an enhanced energy storage performance could be expected in the core−shell structured 1D NWs and 2D NSs filled nanocomposites. Along this line, to further improve the P or ε r of nanocomposites, nanoscale metal fillers and their oxides (Ag, 27−29 Zn, 30 Fe 3 O 4 , 31,32 Ni, 24,33,34 and so on) might be excellent choices due to the percolation theory, where remarkably enhanced P and ε r values of nanocomposites would be realized at low filling fraction. In addition, owing to the high energy barrier of nanoscale metal fillers, the Coulomb blocking effects in the nanocomposites could prevent a second electron from tunneling and block the path of the leakage currents, leading to an enhanced E b of nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Remarkably Enhanced Energy Storage Performances in Well-Designed Core–Shell Ag@TiO₂–Poly(vinylidene fluoride) Nanocomposites

Tan

Hou

Lin

et al. 2022

ACS Appl. Polym. Mater.

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Designing and regulating the microstructure of core−shell fillers are effective ways to fabricate polymer-based nanocomposites with excellent energy storage performances. Along this line, the unique structure combination of 0D metallic Ag nanoparticles (NPs) and 1D bark-like TiO 2 nanowires (NWs) were successfully prepared. Through regulating the volume fraction of Ag NPs (x vol %) in the Ag@TiO 2 NWs, the polarization and breakdown strength of Ag@TiO 2 /PVDF nanocomposites have been optimized, which is evidenced both by the experimental results and finite element simulation. As a result, remarkably enhanced energy storage performances are realized in these nanocomposites. For instance, the 6 vol % Ag@TiO 2 /PVDF nanocomposite shows an excellent performance of the highest discharged energy density of 16.3 J/cm 3 at 376 MV/m, increased by 222% compared with that of pure PVDF (7.4 J/cm 3 , 335 MV/m). Meanwhile, its charge and discharge efficiency remain up to 77% owing to the reduction of the leakage current density caused by the Coulomb blocking effect of small-sized Ag NPs and the prolonged breakdown path resulted by TiO 2 NWs. This proof-of-concept study provides an innovative design thinking of the hybrid structure for obtaining nanocomposites with extraordinary energy storage performances.

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Synergy improvement of dielectric properties and thermal conductivity in PVDF composites with core‐shell structured Ni@SiO2

Cited by 19 publications

References 48 publications

Insights into Synchronously Enhanced Dielectric Properties and Thermal Conductivity of β-SiC_w/PVDF Nanocomposites by Building a Crystalline SiO₂ Shell as an Interlayer

Insights into Synchronously Enhanced Dielectric Properties and Thermal Conductivity of β-SiC_w/PVDF Nanocomposites by Building a Crystalline SiO₂ Shell as an Interlayer

Towards synchronously improving dielectric performance and thermal conductivity in Ni/PVDF by tailoring core-shell structured Ni@NiO particles

Remarkably Enhanced Energy Storage Performances in Well-Designed Core–Shell Ag@TiO₂–Poly(vinylidene fluoride) Nanocomposites

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Synergy improvement of dielectric properties and thermal conductivity in PVDF composites with core‐shell structured Ni@SiO2

Cited by 19 publications

References 48 publications

Insights into Synchronously Enhanced Dielectric Properties and Thermal Conductivity of β-SiCw/PVDF Nanocomposites by Building a Crystalline SiO2 Shell as an Interlayer

Insights into Synchronously Enhanced Dielectric Properties and Thermal Conductivity of β-SiCw/PVDF Nanocomposites by Building a Crystalline SiO2 Shell as an Interlayer

Towards synchronously improving dielectric performance and thermal conductivity in Ni/PVDF by tailoring core-shell structured Ni@NiO particles

Remarkably Enhanced Energy Storage Performances in Well-Designed Core–Shell Ag@TiO2–Poly(vinylidene fluoride) Nanocomposites

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Insights into Synchronously Enhanced Dielectric Properties and Thermal Conductivity of β-SiC_w/PVDF Nanocomposites by Building a Crystalline SiO₂ Shell as an Interlayer

Insights into Synchronously Enhanced Dielectric Properties and Thermal Conductivity of β-SiC_w/PVDF Nanocomposites by Building a Crystalline SiO₂ Shell as an Interlayer

Remarkably Enhanced Energy Storage Performances in Well-Designed Core–Shell Ag@TiO₂–Poly(vinylidene fluoride) Nanocomposites