Microwave absorption properties of Ag naowires/carbon black composites

Huang, Hailong; Xia, Hui; Guo, Zhibo; Chen, Yu; Li, Hongjian

doi:10.1088/1674-1056/26/2/025207

Cited by 17 publications

(12 citation statements)

References 34 publications

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“…From top to bottom, they are a metallic layer of dendritic resonator, one layer of graphene sheets, a thin silicon dioxide layer, the GaAs substrate and the metallic ground plane, respectively, tightly stacked to form the unit cell of the absorber. The geometrical parameters of the unit cell are obtained after performance optimization through EM simulation [22,23]. The best parameters are listed as follows: p = 700 nm, θ = 45°, w = 30.5 nm, a = 80 nm, b = 62.5 nm, c = 35.7 nm.…”

Section: Structure and Methodsmentioning

confidence: 99%

Dynamically tunable dendritic graphene-based absorber with thermal stability at infrared regions

et al. 2018

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The infrared polarization-insensitive absorber, which is composed of dendritic metal, graphene layer, silicon dioxides layer, gallium arsenide substrate, and metal plate, is investigated theoretically and numerically. The tunability can be realized by loading a graphene layer into the structure. The position of absorption peak can be tuned by manipulating the graphene's Fermi energy. Compared with the previously reported graphene-based absorbers, the system has the advantage of temperature-independent high absorption. The results indicate that the proposed absorber can be used in the applications of the refractive index sensor with a sensitivity of 587.8 nm/refractive index unit and temperature-insensitive infrared absorber.

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Section: Structure and Methodsmentioning

confidence: 99%

Dynamically tunable dendritic graphene-based absorber with thermal stability at infrared regions

et al. 2018

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“…The N-PGNs-2 sample possesses the highest specific surface area (876 m 2 g –1 ). It will generate more abundant interfaces, which result in strong relaxation loss due to the interfacial polarization. − In addition, due to the larger electronegativity, N doping donates electrons to the original ideal carbon atom system, which leads to enhanced dielectric loss. Meanwhile, the introduced intrinsic defects and unique electronic properties not only bring strong polarization loss to the absorber but also give rise to the balanced impedance matching …”

Section: Resultsmentioning

confidence: 99%

“…The phenomenon further explains that polarization and conduction loss can inspire enhanced dielectric loss and weaken more electromagnetic waves. The moduli of Z in – 1 of four N-PGN samples at the thickness of 3.9 mm from 2–18 GHz are investigated to study the impedance matching characteristics as revealed in Figure d. It is clear to find that the modulus of Z in – 1 of the N-PGNs-6 sample far outweighs zero, suggesting the poor impedance matching.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Ultralight N-Rich Porous Graphene Nanosheets Derived from Fluid Catalytic Cracking Slurry and Their Electromagnetic Wave Absorption Properties

Liu

Duan

Deng

et al. 2020

Ind. Eng. Chem. Res.

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The high value-added utilization of fluid catalytic cracking (FCC) slurry has always been full of challenges and has important practical significance. Ultralight N-rich porous graphene nanosheets (N-PGNs) have been synthesized via a chemical vapor deposition method using FCC slurry as a carbon source and g-C3N4 as a substrate. The N-PGNs integrate interesting features including high N doping and large surface area with ultrahigh pore volume, which leads to intriguing performance in electromagnetic wave absorption (EMWA) along with broad absorption bandwidth. When the ratio of FCC slurry and g-C3N4 continues to optimize, the maximum reflection loss of the N-PGNs can reach −53 dB with a low filler loading of only 3 wt %, and the effective absorption bandwidth exceeding −10 dB is 6.8 GHz with a thickness of 3 mm. The excellent property of the N-PGNs and their extraordinary EMWA performance develop a new pathway for the high value-added utilization of FCC slurry.

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“…The FEM solution is employed in the numerical study 23 . The analysis model of the sample is constructed including all the components of practical structures.…”

Section: Methodsmentioning

confidence: 99%

Microwave properties of the single-layer periodic structure composites composed of ethylene-vinyl acetate and polycrystalline iron fibers

Guo

Huang

Xie

et al. 2017

Sci Rep

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A single-layer microwave absorbing structure composed of the ethylene-vinyl acetate (EVA) powders and polycrystalline iron fibers (PIFs) with thickness of 2 mm, which has a periodic array of circular hole, is designed and fabricated using the mechanical method. We show that the reflection loss (RL) can be easily adjusted by changing the geometric parameters. The maximum RL is 18.7 dB at 15 GHz, and the effective absorption bandwidth of 1.7 GHz for the diameter of circular hole is 10 mm, and enhanced to be 23.7 dB at 15.1 GHz with the corresponding bandwidth of 7.2 GHz when the diameter decreases to 5 mm. The measured absorption of the composite is in good accordance with the simulation results. Furthermore, the possible absorption mechanism of the composite has been discussed. Our results illustrate that the integration of frequency selective surface (FSS) with traditional PIFs can achieve a wide frequency range of a strong absorption.Microwave absorbing materials (MAMs) are extensively utilized to absorb electromagnetic wave effectively and convert electromagnetic energy into heat or make electromagnetic wave disappear by interference 1 . Traditional MAMs such as various shapes of spongy absorbers in darkroom and stealthy coating for aircraft have been well developed 2-8 . In past decades, the composites containing different kinds of micro or nano components for microwave absorption are fabricated and tested in laboratories 9-12 . However for the traditional MAMs or other novel MAMs, such as carbon black, ferrites and metals, they all still have some disadvantages like high density, narrow band and low absorption. These disadvantages will hamper their potential applications in cloaking, lightweight absorbers. Therefore to develop more advanced MAMs with low density, broad and adjustable absorption band are in urgent.A frequency selective surface (FSS) is a two-dimensional planar periodic array that can be used to reflect or transmit electromagnetic waves selectively 13 . Traditional metallic FSSs are not suitable to fabricate MAMs due to low absorption at its resonant frequency, so a bonding is needed to attach metallic FSS to the dielectric slabs to make effective MAMs, but the increased weight and thickness will also hamper their potential applications. Then the FSSs made of polymer matrix composite materials have been proposed. For example, Huynen. I et al. fabricated the lightweight MAMs, which are composed of a metallic honeycomb and carbon nanotube-reinforced polymer foam. The results show that the enhanced absorption over a wide frequency range can be obtained 14 . Chen et al. reported a lightweight microwave absorbing structure with two dimensional composite lattice cores, which can be regarded as an effective absorber with a wider absorption band 15 . Kim et al. prepared the MAM composed of FSS screens and E-glass/epoxy composite using the printed circuit board method, which showed the good microwave absorption properties 16 . Khurram et al. prepared high performance MAMs by filling a thermoplastic res...

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Microwave absorption properties of Ag naowires/carbon black composites

Cited by 17 publications

References 34 publications

Dynamically tunable dendritic graphene-based absorber with thermal stability at infrared regions

Dynamically tunable dendritic graphene-based absorber with thermal stability at infrared regions

Synthesis of Ultralight N-Rich Porous Graphene Nanosheets Derived from Fluid Catalytic Cracking Slurry and Their Electromagnetic Wave Absorption Properties

Microwave properties of the single-layer periodic structure composites composed of ethylene-vinyl acetate and polycrystalline iron fibers

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