Tunable radio-frequency negative permittivity of Carbon/CaCu3Ti4O12 metacomposites

Qu, Yunpeng; Wu, Yulin; Fan, Guohua; Xie, Peitao; Liu, Yao; Zhang, Zidong; Xin, Jiahao; Jiang, Qian; Sun, Kai

doi:10.1016/j.jallcom.2020.155164

Cited by 34 publications

(27 citation statements)

References 36 publications

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“…Co. Ltd. CaCO 3 , CuO, and TiO 2 (99.9%) powders were acquired from Sinopharm Chemical Reagent Co. Ltd. All raw materials were used as received. CCTO powders were synthetized by solid-state reaction according to the work by Qu et al 23 The low-temperature sintering process consists of calcining the green body at 850 °C for 6 h and sintering at 950 °C for 1 h under a nitrogen flow, with no sintering aid added. The surface of sintered CCTO samples was polished and then manufactured to disks (diameter 15 mm × thickness 2 mm).…”

Section: Methodsmentioning

confidence: 99%

“…Graphene and carbon black could provide a high conductive area and moderate electron concentration, respectively, and thereby facilitate the realization of a weakly low-frequency plasmonic state in percolative carbon networks. 23,26,28 Moreover, the heterogeneously GR−CB dual units may benefit the damped resonance of the induced electric dipole when the GR−CB content is near the percolation threshold. 23 CaCu 3 Ti 4 O 12 perovskite ceramic has been widely investigated on account of its colossal positive permittivity.…”

Section: Introductionmentioning

confidence: 99%

“…23,26,28 Moreover, the heterogeneously GR−CB dual units may benefit the damped resonance of the induced electric dipole when the GR−CB content is near the percolation threshold. 23 CaCu 3 Ti 4 O 12 perovskite ceramic has been widely investigated on account of its colossal positive permittivity. 27,28 The internal barrier layer capacitor structure of CCTO leads to its great thermostability and benefits the low-temperature sintering process.…”

Section: Introductionmentioning

confidence: 99%

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Graphene–Carbon Black/CaCu₃Ti₄O₁₂ Ternary Metacomposites toward a Tunable and Weakly ε-Negative Property at the Radio-Frequency Region

Lin

et al. 2020

J. Phys. Chem. C

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The ε-negative property in metacomposites has triggered tremendous interest in electromagnetic fields. In this work, a tunable and weakly ε-negative property was obtained in graphene−carbon black/ CaCu 3 Ti 4 O 12 (GR−CB/CCTO) ternary metacomposites prepared by a low-temperature pressure-less sintering process. Interestingly, two types of the ε-negative mechanism, that is, induced electric dipole generated from isolating GR−CB units and low-frequency plasmonic state generated from GR−CB networks, have been observed in GR−CB/CCTO metacomposites. Hence, the ε-negative property was explained by superposition of the Drude model and Lorentz model. It is noteworthy that the weakly ε-negative value ranged from the quadratic to third order of magnitude of ten and was tuned by adjusting the content of randomly distributed GR−CB units. The ε-near-zero behavior was observed at around 475 and 85 MHz for the composites with GR−carbon nanotube contents of 8 and 10 wt %, respectively. In addition, ac conductivity spectra showed a change of conduction mechanism from hopping conduction to metal-like conduction with increasing GR−CB content. The inductive character derived from the GR−CB networks significantly correlates with the ε-negative property, as clarified by equivalent circuit models. This work presents a novel design paradigm of ternary metacomposites with a tunable and weakly ε-negative property, which will greatly facilitate its practical applications in electromagnetic shielding, high-permittivity capacitors, and metamaterials.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Graphene–Carbon Black/CaCu₃Ti₄O₁₂ Ternary Metacomposites toward a Tunable and Weakly ε-Negative Property at the Radio-Frequency Region

Lin

et al. 2020

J. Phys. Chem. C

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“…When the composites are put into an electric field, the extensive delocalized electrons would be accelerated under the action of electric field force and then be drawn backward by the coulombic forceexerted by positive ion cores. Such a repeated motion process of electrons in alternating electric field is considered as plasma oscillations [99,100]. It's widely accepted that the negative permittivity behavior derived from plasmonic state of free electrons is plasma-like, the real part of permittivity that deduced from the Drude model of equation ( 1) is represented as below [23,101]:…”

Section: Mechanism Of Negative Permittivity In Enmsmentioning

confidence: 99%

Epsilon-negative media from the viewpoint of materials science

et al. 2021

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A comprehensive review of the fundamentals and applications of epsilon-negative materials is presented in this paper. Percolative composites, as well as homogeneous ceramics or polymers, have been investigated to obtain the tailorable epsilon-negative properties. It's confirmed the anomalous epsilon-negative property can be realized in conventional materials. Meanwhile, from the perspective of materials science, the relationship between the negative permittivity and the composition and microstructure of materials has been clarified. It's demonstrated that the epsilon-negative performance is attributed to the plasmonic response of delocalized electrons within the materials and can be modulated by it. Moreover, the potential applications of epsilon-negative materials in electromagnetic interference shielding, laminated composites for multilayered capacitance, coil-less electric inductors, and epsilon-near-zero metamaterials are reviewed. The development of epsilon-negative materials has enriched the connotation of metamaterials and advanced functional materials, and has accelerated the integration of metamaterials and natural materials.

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“…As seen in the figure, the resistance decreases with increasing frequency. This feature could be explained by Jonscher's power law, which, as given in Equation 6, expresses the relation between AC conductivity (σ ac ) and frequency (f ) [48].…”

Section: Piezocapacitance Characteristics Of the Tactile Sensormentioning

confidence: 99%

A Flexible and Low-Cost Tactile Sensor Produced by Screen Printing of Carbon Black/PVA Composite on Cellulose Paper

Sekertekin

Bozyel

Gökcen

2020

Sensors

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This study presents the design and fabrication of a flexible tactile sensor printed on a cellulose paper substrate using a carbon black (CB) – filled polyvinyl alcohol (PVA) polymer matrix as ink material. In the design, electrodes are obtained by screen printing of CB/PVA composite on dielectric cellulose paper. The screen-printing method is preferred for fabrication because of its simplicity and low manufacturing cost. The tactile sensor is formed by overlapping two ink-printed sheets. Electrical properties are investigated under compressive and tensile strains. The results indicate that the tactile sensor configuration and materials can be used for piezoresistive, capacitive, and also impedance sensors. The same tactile sensor structure is also examined using a commercial carbon-based ink for performance comparison. The comparative study indicates that CB/PVA ink screen-printed on paper demonstrates superior sensitivity for capacitive sensing with low hysteresis, as well as low response and recovery times. The piezoresistive-sensing properties of CB/PVA on cellulose paper show a gauge factor (GF) of 10.68, which is also very promising when conventional metal strain gauges are considered. CB/PVA screen-printed on cellulose paper features impedance-sensing properties and is also sensitive to the measurement frequency. Therefore, the response type of the sensor can be altered with the frequency.

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Tunable radio-frequency negative permittivity of Carbon/CaCu3Ti4O12 metacomposites

Cited by 34 publications

References 36 publications

Graphene–Carbon Black/CaCu₃Ti₄O₁₂ Ternary Metacomposites toward a Tunable and Weakly ε-Negative Property at the Radio-Frequency Region

Graphene–Carbon Black/CaCu₃Ti₄O₁₂ Ternary Metacomposites toward a Tunable and Weakly ε-Negative Property at the Radio-Frequency Region

Epsilon-negative media from the viewpoint of materials science

A Flexible and Low-Cost Tactile Sensor Produced by Screen Printing of Carbon Black/PVA Composite on Cellulose Paper

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Tunable radio-frequency negative permittivity of Carbon/CaCu3Ti4O12 metacomposites

Cited by 34 publications

References 36 publications

Graphene–Carbon Black/CaCu3Ti4O12 Ternary Metacomposites toward a Tunable and Weakly ε-Negative Property at the Radio-Frequency Region

Graphene–Carbon Black/CaCu3Ti4O12 Ternary Metacomposites toward a Tunable and Weakly ε-Negative Property at the Radio-Frequency Region

Epsilon-negative media from the viewpoint of materials science

A Flexible and Low-Cost Tactile Sensor Produced by Screen Printing of Carbon Black/PVA Composite on Cellulose Paper

Contact Info

Product

Resources

About

Graphene–Carbon Black/CaCu₃Ti₄O₁₂ Ternary Metacomposites toward a Tunable and Weakly ε-Negative Property at the Radio-Frequency Region

Graphene–Carbon Black/CaCu₃Ti₄O₁₂ Ternary Metacomposites toward a Tunable and Weakly ε-Negative Property at the Radio-Frequency Region