Highly ordered porous carbon/wax composites for effective electromagnetic attenuation and shielding

Song, Wei‐Li; Cao, Mao‐Sheng; Fan, Li‐Zhen; Lu, Mingming; Li, Yong; Wang, Chanyuan; Ju, Hong-Fei

doi:10.1016/j.carbon.2014.05.014

Cited by 281 publications

(129 citation statements)

References 59 publications

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“…The conductivity makes a great contribution to the ε ′′ of the hybrids, 22,23 for the reason that the conductivity of PPy is high. It has been well-documented that the electrical conductive network can be well established in the PPy based hybrids.…”

Section: Resultsmentioning

confidence: 99%

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Three-dimensional (3D) α-Fe2O3/polypyrrole (PPy) nanocomposite for effective electromagnetic absorption

et al. 2016

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The lightweight and 3-dimensional reticulated α-Fe2O3/PPy hybrids were successfully fabricated via a facile one-pot polyreaction. The measured complex permittivity and microwave attenuation performance suggest that the dielectric properties of PPy can be regulated by the mass ratio of added α-Fe2O3. The two dielectric resonance peaks of complex permittivity can be ascribed to the interface capacitor-like structure. An equivalent circuit model was established to explain the nonlinear resonance behavior of the α-Fe2O3/PPy wax composites. The addition of α-Fe2O3 properly tuned the dielectric constant to endow the composites with highly efficient microwave absorption. The minimum reflection loss of α-Fe2O3/PPy wax composites were enhanced to nearly −29dB with an effective bandwidth (RL≤ − 10dB) up to 5.0GHz. The numerical method was proposed to calculate the optimum thickness for minimum RL at expected frequency by detailed investigation on the transmission formula. Moreover, the required thickness for optimum absorption efficiency at expected frequency can be obtained directly.

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Section: Resultsmentioning

confidence: 99%

“…The program mentioned above will repeat ceaselessly until the inner reflected EM wave attenuates to zero. 23,24 The intensity of the EM wave reflected back to air is called reflection loss (RL), which can be calculated by the transmission line theory. 29…”

Section: Resultsmentioning

confidence: 99%

Three-dimensional (3D) α-Fe2O3/polypyrrole (PPy) nanocomposite for effective electromagnetic absorption

et al. 2016

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“…Gangue (SiO 2 , purity > 99%), carbon black, iron(III) acetylacetonate (Fe(acac) 3 ), ethyl acetate, and sodium hydroxide were supplied by Sinopharm Chemical Reagent Beijing Co., Ltd. Argon (99.99%) was supplied by Haipu Gas Co., Ltd. Deionized water and ethanol were used in all of the experiments.…”

Section: Methodsmentioning

confidence: 99%

“…The preparation procedure of SiC@SiO 2 @Fe 3 O 4 hybrids was as follows: 100 mg SiC@SiO 2 nanowires were added to 25 mL triethylene glycol solution in an ultrasonic bath to obtain a uniform suspension. The iron precursor, Fe(acac) 3 , was added to the resulting suspension, and the resulting mixture was sonicated for approximately 30 min to form a well-distributed solution. The mixture was subsequently heated to 280°C at a rate of 3°C·min …”

Section: Synthesis Of Sic@sio 2 @Fe 3 O 4 Hybridsmentioning

confidence: 99%

Microwave absorption properties of SiC@SiO2@Fe3O4 hybrids in the 2–18 GHz range

Zhou

Chen

et al. 2017

Int J Miner Metall Mater

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Abstract:To enhance the microwave absorption performance of silicon carbide nanowires (SiCNWs), SiO 2 nanoshells with a thickness of approximately 2 nm and Fe 3 O 4 nanoparticles were grown on the surface of SiCNWs to form SiC@SiO 2 @Fe 3 O 4 hybrids. The microwave absorption performance of the SiC@SiO 2 @Fe 3 O 4 hybrids with different thicknesses was investigated in the frequency range from 2 to 18 GHz using a free-space antenna-based system. The results indicate that SiC@SiO 2 @Fe 3 O 4 hybrids exhibit improved microwave absorption. In particular, in the case of an SiC@SiO 2 to iron(III) acetylacetonate mass ratio of 1:3, the microwave absorption with an absorber of 2-mm thickness exhibited a minimum reflection loss of −39.58 dB at 12.24 GHz. With respect to the enhanced microwave absorption mechanism, the Fe 3 O 4 nanoparticles coated on SiC@SiO 2 nanowires are proposed to balance the permeability and permittivity of the materials, contributing to the microwave attenuation.

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“…As the development of new types of EM absorbers only by varying magnetic components and permeability is quite limited, much research attention has been directed towards finding innovative dielectric loss materials with low density and high loss performance. Among various kinds of dielectric loss materials, carbon materials have always been attractive due to their low density, abundant resources, and low cost [27][28][29]. In particular, carbon nanotubes have been regarded as one competitive candidate based on their good conductivity, strong mechanical property, and high aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

Strengthened electromagnetic absorption performance derived from synergistic effect of carbon nanotube hybrid with Co@C beads

Qiao

Liu

et al. 2017

Adv Compos Hybrid Mater

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The composite structure of Co beads (200-300 nm) threaded by carbon nanotubes has been synthesized through a facile solvothermal method followed by a carbon reduction process. A carbon layer of ca. 5 nm was coated on the surface of Co beads to form a coreshell structure (CNTs/Co@C), in favor of the antioxidation of Co nanoparticles. The CNTs/Co@C hybrid showed a saturation magnetization (M s ) of 82.5 emu g −1 and a larger H c value of 258.8 Oe than bulk Co (ca. 10 Oe). Served as an EM wave absorption material, the epoxy resin composites consisting of 60 wt% and 40 wt% CNTs/Co@C hybrid exhibited effective EM absorption (RL < − 10 dB) over the frequency ranges of 1.5-15 and 1.6-20 GHz with the matching thicknesses of 1.0-7.5 and 1.0-10.0 mm, respectively. The superior EM absorption performances of CNTs/Co@C hybrid containing strong absorption, wide frequency range, thin thickness, and light weight are mainly attributed to the synergy of magnetic loss from Co beads and dielectric loss from carbon nanotubes, as well as remarkable impedance matching.

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Highly ordered porous carbon/wax composites for effective electromagnetic attenuation and shielding

Cited by 281 publications

References 59 publications

Three-dimensional (3D) α-Fe2O3/polypyrrole (PPy) nanocomposite for effective electromagnetic absorption

Three-dimensional (3D) α-Fe2O3/polypyrrole (PPy) nanocomposite for effective electromagnetic absorption

Microwave absorption properties of SiC@SiO2@Fe3O4 hybrids in the 2–18 GHz range

Strengthened electromagnetic absorption performance derived from synergistic effect of carbon nanotube hybrid with Co@C beads

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