Low-frequency plasmonic state and negative permittivity in copper/titanium dioxide percolating composites

Wei, Zaixin; Wang, Zhongyang; Fan, Guohua; Xu, Ciqun; Shi, Guangyue; Zhang, Guodong; Liu, Yao; Fan, Runhua

doi:10.1016/j.ceramint.2020.09.060

Cited by 26 publications

(7 citation statements)

References 54 publications

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“…This is mainly due to the interfacial polarization. 26 And the real part of the dielectric constant increases with the increase of metal powder content, which is to the effective medium theory.…”

Section: Resultsmentioning

confidence: 72%

Tunable Dielectric Properties in Paraffin-Matrix Metacomposites via Macro-Scale Periodic Stacking of the Functional Fillers

Wang¹,

Guo²,

Han³

et al. 2022

ECS J. Solid State Sci. Technol.

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As electronic devices play an increasingly important role in industry and daily life, the demand for materials with excellent dielectric properties to meet different needs is also increasing. Here, the effects of the composition and diameter of functional phases on the dielectric properties were investigated, in which the periodically arranged composites are prepared by gravitational self-assembly and the volume fraction of functional phases was controlled. The results show that the micro capacitor introduced by the periodically arranged functional phase leads to a substantial increase in the dielectric constant of the composites when the content is the same. Changing the particle size of the functional phase can in turn change the polarity of the micro capacitor to modulate the dielectric properties. It is worth noting that the introduction of the ceramic phase can effectively regulate the dielectric loss of the composite by introducing a new loss mechanism while maintaining a high dielectric constant. This paper provides a deeper understanding of the dielectric property regulation, which provides new ideas for the special dielectric regulation of electronic devices.

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Section: Resultsmentioning

confidence: 72%

Tunable Dielectric Properties in Paraffin-Matrix Metacomposites via Macro-Scale Periodic Stacking of the Functional Fillers

Wang¹,

Guo²,

Han³

et al. 2022

ECS J. Solid State Sci. Technol.

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“…Moreover, some other composites with dielectric and metal particles (Ni, Fe, Cu, etc.) as fillers showed similar phenomena. − Li et al attributed the negative permittivity behavior of BiFeO 3 /Bi 2 Fe 4 O 9 composites at about 1 GHz to dielectric resonance. Generally, the negative permittivity behavior obtained by plasma oscillation has a wide range and good tunability, but the loss is extremely high and the order of magnitude is large, limiting its use in dielectric capacitors and high-power microwave filters. , Dielectric resonance produces a small loss of negative permittivity, but the resonance often occurs at a fixed frequency, resulting in poor tunability. , Achieving a combination of two negative permittivity behaviors in the same material can address these challenges.…”

Section: Introductionmentioning

confidence: 89%

“…Generally, the negative permittivity behavior obtained by plasma oscillation has a wide range and good tunability, but the loss is extremely high and the order of magnitude is large, limiting its use in dielectric capacitors and high-power microwave filters. 12,22 Dielectric resonance produces a small loss of negative permittivity, but the resonance often occurs at a fixed frequency, resulting in poor tunability. 21,23 Achieving a combination of two negative permittivity behaviors in the same material can address these challenges.…”

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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“…The periodic metamaterials theory explains how random materials can exhibit negative permittivity behavior by utilizing their inherent characteristics. − These metacomposites with isotropic electromagnetic response can be made using conventional materials techniques, and their properties can be effectively manipulated by adjusting their chemical compositions and microstructures. − …”

Section: Introductionmentioning

confidence: 99%

Flexible MWCNT/PVA/Mn Ferrite/AC Metacomposites with Tunable Negative Permittivity for Low-Frequency Reflectors and Optical Sensors

Gholipur,

Maazi

2023

ACS Appl. Nano Mater.

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With the development of new metamaterials made of periodic array structures, negative permittivity has recently received more and more attention. However, it is crucial to achieve negative permittivity behavior based on materials' intrinsic properties rather than their synthetically periodic structures, as easy preparation is always a priority. Wearable cloaks, stretchable sensors, thin-film capacitors, and other applications all hold great promise for flexible metacomposites with tunable negative permittivity. Herein, flexible multi-walled carbon nanotube/poly(vinyl alcohol)/manganese ferrite/active carbon (MWCNT/PVA/Mn ferrite/AC) porous metacomposites with negative dielectric constant were prepared by feasible sol−gel method. The resulting metacomposites with various MWCNT mass values were examined for their ac conductivity behavior, magnetic and dielectric characteristics, impedance, and absorbance performances. The findings indicate that these novel amorphous metacomposites possess exceptional qualities, such as superior impedance matching, magnetic characteristics, exceptional reflectivity, and proficiency as an optical sensor, alongside their negative dielectric constant.

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Low-frequency plasmonic state and negative permittivity in copper/titanium dioxide percolating composites

Cited by 26 publications

References 54 publications

Tunable Dielectric Properties in Paraffin-Matrix Metacomposites via Macro-Scale Periodic Stacking of the Functional Fillers

Tunable Dielectric Properties in Paraffin-Matrix Metacomposites via Macro-Scale Periodic Stacking of the Functional Fillers

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

Flexible MWCNT/PVA/Mn Ferrite/AC Metacomposites with Tunable Negative Permittivity for Low-Frequency Reflectors and Optical Sensors

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