Flexible multi-walled carbon nanotubes/polyvinylidene fluoride membranous composites with weakly negative permittivity and low frequency dispersion

Sun, Kai; Duan, Wenxin; Lei, Yanhua; Wang, Zongxiang; Tian, Jiahong; Yang, Pengtao; He, Qifa; Chen, Min; Wu, Haikun; Zhang, Zheng

doi:10.1016/j.compositesa.2022.106854

Cited by 39 publications

(21 citation statements)

References 66 publications

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“…The initial decomposition temperatures increase with f LG , reaching 430, 438, 439, 440, 442, 443, and 443 °C for the pure PVDF and the LG/PVDF nanocomposites with f LG = 0.02, 0.04, 0.06, 0.08, 0.09, and 0.10, respectively. The thermal degradation after reaching 470 °C was primarily attributed to the cleavage of oxygen-containing functional groups and grafted molecular chains . Thus, the addition of LG filler can improve the thermal stability of PVDF polymer by increasing the decomposition temperature of LG/PVDF nanocomposites, as shown in the inset of Figure c.…”

Section: Resultsmentioning

confidence: 93%

“…The thermal degradation after reaching 470 °C was primarily attributed to the cleavage of oxygen-containing functional groups and grafted molecular chains. 42 Thus, the addition of LG filler can improve the thermal stability of PVDF polymer by increasing the decomposition temperature of LG/PVDF nanocomposites, as shown in the inset of Figure 3c.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

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Renewable Lignin-Derived Graphene-like/PVDF Nanocomposites with High Dielectric Constant and Low Loss Tangent

Meeporn,

Morvezen,

de Vecchy

et al. 2023

J. Phys. Chem. C

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Section: Resultsmentioning

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 97%

Renewable Lignin-Derived Graphene-like/PVDF Nanocomposites with High Dielectric Constant and Low Loss Tangent

Meeporn,

Morvezen,

de Vecchy

et al. 2023

J. Phys. Chem. C

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“…The frequency spectra of r AC exhibit a DC plateau r DC at low frequency that arises mainly from uninhibited random hopping of ions [36]. Obviously, as the glycerol content exceeds the percolation concentration (C 15 wt% of PVA), charge carriers travel long distances through a continuous network structure of glycerol, and the DC region expands [37,38].…”

Section: Electrical Propertiesmentioning

confidence: 99%

Synergetic effects of nano-SiO2/glycerol on the electrical and optical properties of PVA for embedded electronics and optical applications

Mousa

Taha

2022

J Mater Sci: Mater Electron

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The present study aims to prepare a low-cost, eco-friendly, free-standing film with optimized physical properties. A PVA composite of hard-soft hybrid filler ratio 1:3 (nSiO2:Gl) is prepared by casting. Dynamic mechanical analyses are processed in the frequency range (0.01–9 Hz). Moreover, dielectric studies are performed in the frequency range (50 Hz–5 MHz). Herein, the modified Jonscher equation and electric modulus formalism are used to explain the results. Transmittance and reflectance of studied samples are measured in the UV–Vis range (200–700 nm). Detailed discussions of band structure, refractive index, and optoelectronic parameters are addressed. Remarkably, the results showed that mechanical and electrical properties of PVA can be tuned by careful modulation of glycerol content, whereas optical properties are more sensitive to nSiO2 content. Finally, FTIR and SEM structural analyses investigate the induced structural changes in PVA.

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“…Materials with negative permittivity in the radio frequency (RF) have attracted much attention in recent years due to their great potential applications in electronic devices such as electromagnetic stealth, capacitors, transistors, and antennas . In general, the negative permittivity in RF can be achieved by the plasma oscillation of conductors or the dielectric resonance of ferroelectric materials under an applied electric field. − In past reports, these two negative permittivity behaviors have mostly appeared in different materials, − and thus have been studied separately. For example, Shi et al prepared Ag/Al 2 O 3 composites and observed negative permittivity, which can be well described by the Drude model.…”

Section: Introductionmentioning

confidence: 99%

Negative Permittivity Behaviors Derived from Dielectric Resonance and Plasma Oscillation in Percolative Bismuth Ferrite/Silver Composites

Yang

Sun

et al. 2022

J. Phys. Chem. C

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Negative permittivity of materials can be obtained by plasma oscillation or dielectric resonance, but the relationship between these two negative permittivity behaviors has been neglected. Combining the advantages of two negative permittivity behaviors, the negative permittivity can be more tunable and is expected to realize epsilon-near-zero behavior. In this work, percolative bismuth ferrite/silver composites with different contents of Ag were successfully fabricated by a simple solid-state sintering method. With the addition of Ag, the Lorentz-like and Drude-like negative permittivity behaviors were successively observed in bismuth ferrite/silver composites. The reasons for the two types of negative permittivity behaviors are dielectric resonance and plasma oscillation, respectively. Further investigation revealed that the synergistic effect of dipole resonance and free electrons led to a change of resonance frequency, a decrease of magnitude, and a transition of two negative permittivity behaviors. Moreover, with the addition of Ag in percolative bismuth ferrite/silver composites, the electrical conductivity and thermal conductivity changed abruptly at a certain volume fraction, suggesting a percolation behavior.

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Flexible multi-walled carbon nanotubes/polyvinylidene fluoride membranous composites with weakly negative permittivity and low frequency dispersion

Cited by 39 publications

References 66 publications

Renewable Lignin-Derived Graphene-like/PVDF Nanocomposites with High Dielectric Constant and Low Loss Tangent

Renewable Lignin-Derived Graphene-like/PVDF Nanocomposites with High Dielectric Constant and Low Loss Tangent

Synergetic effects of nano-SiO2/glycerol on the electrical and optical properties of PVA for embedded electronics and optical applications

Negative Permittivity Behaviors Derived from Dielectric Resonance and Plasma Oscillation in Percolative Bismuth Ferrite/Silver Composites

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