Iron/epoxy random metamaterials with adjustable epsilon-near-zero and epsilon-negative property

Liu, Mingxiang; Lan, Xiaopeng; Zhang, Haoyuan; Xie, Peitao; Wu, Nannan; Yuan, Hua; Sui, Kunyan; Fan, Runhua; Liu, Chun-Zhao

doi:10.1007/s10854-021-06150-8

Cited by 22 publications

(10 citation statements)

References 67 publications

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“…Clarifying the relation between inductive character and ε′-negative property can greatly benefit the practical applications of ε′-negative materials in novel sensors and antenna. [24][25][26][27][28][29]…”

Section: Resultsmentioning

confidence: 99%

Communication—Function-Oriented Design of 3D Carbon Networks Toward Negative Permittivity at kHz Frequencies

et al. 2022

ECS J. Solid State Sci. Technol.

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Three-dimensional (3D) carbon networks composed of graphene (GR) and carbon nanotube (CNT) were constructed in copper calcium titanate (CCTO) in order to realize negative permittivity behavior. The results show that negative permittivity can be obtained at kHz frequencies above percolation threshold when 3D carbon networks are successfully constructed. Negative permittivity originates from the low-frequency plasmonic state which is explained by the Drude model. The magnitude of negative permittivity was tuned between 105 and 106 which significantly correlates with concentration of free carriers. Moreover, the reactance spectra clarify the inductive character of negative permittivity materials.

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Section: Resultsmentioning

confidence: 99%

Communication—Function-Oriented Design of 3D Carbon Networks Toward Negative Permittivity at kHz Frequencies

et al. 2022

ECS J. Solid State Sci. Technol.

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“…As shown in Fig. 4(a Therefore, the inductive conductive network is the decisive building block to achieve negative permittivity, there is a competitive effect for reactance in the percolative dielectric composites consisting of conductive fillers, only the negative permittivity behavior occurs when the inductive character is stronger than the capacitive character, which is the main reason for the two percolation behaviors for the variation of dielectric permittivity [38,39].…”

Section: Impedance and Equivalent Circuit Analysismentioning

confidence: 99%

Two percolation behaviors in binary heterogeneous composites for high permittivity and negative permittivity

Li¹,

Meng²,

Xie³

et al. 2022

Eng. Sci.

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Percolative composite is usually studied to achieve high permittivity when the fraction of fillers reaches the percolation threshold; besides, negative permittivity has also been a research hotspot and can be obtained above the percolation threshold. However, no studies have clarified whether the two percolation behaviors are the same one. Herein, the binary heterogeneous composites consisting of titanium nitride (TiN) particles and epoxy were prepared by compression molding, dielectric performance and percolation behavior were studied. Two percolation behaviors were demonstrated with increasing the TiN content. The first percolation behavior is to describe the high permittivity while the second one is to describe negative permittivity. It is interesting to find that the two percolation behaviors are actually associated with the competitive effect between inductance and capacitance. As a consequence, a high permittivity of 419 and a negative permittivity of -18 are obtained near the two percolation thresholds (42 % and 50 %), respectively. This work presents a clear physical description for the percolation phenomenon in the view of dielectric performance.

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“…[63,64] When MWCNTs content was further improved to 20 wt%, the tanδ significantly increased to about 5, which was ascribed to the contributions of inductors and conduction loss. [65][66][67] For the PS/MWCNTs film with MWCNTs content of 15 wt%, the high real permittivity with value of about 17 and low dielectric loss with value of about 0.…”

Section: Dielectric Properties Of Ps/mwcnts Filmsmentioning

confidence: 99%

Flexible and biocompatible polystyrene/multi-walled carbon nanotubes films with high permittivity and low loss

Wang¹

2022

ES Mater. Manuf.

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Percolative composites with high permittivity and low loss have drawn enormous attention in the research community, exhibiting wide range of applications in sensors, capacitors, field-effect transistors, antennas, etc. In this work, flexible and biocompatible polystyrene/multi-walled carbon nanotubes (PS/MWCNTs) films with high permittivity and low loss near percolation threshold were achieved by solution mixing assisted with non-solvent induced phase separation (NIPS) strategy and followed by the hot press method. Cytotoxicity experiments proved that the experimental process and products are green, environmentally friendly and biocompatible. The microstructure and dielectric properties were investigated. When MWCNTs content reached 15 wt%, high permittivity and low loss were simultaneously realized. Combining the flexibility and non-toxicity, the PS/MWCNTs films with high permittivity and low loss exhibit great potentials in wearable devices, skin sensors and flexible electronics.

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Iron/epoxy random metamaterials with adjustable epsilon-near-zero and epsilon-negative property

Cited by 22 publications

References 67 publications

Communication—Function-Oriented Design of 3D Carbon Networks Toward Negative Permittivity at kHz Frequencies

Communication—Function-Oriented Design of 3D Carbon Networks Toward Negative Permittivity at kHz Frequencies

Two percolation behaviors in binary heterogeneous composites for high permittivity and negative permittivity

Flexible and biocompatible polystyrene/multi-walled carbon nanotubes films with high permittivity and low loss

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