Design and fabrication of carbon fiber/carbonyl iron core–shell structure composites as high-performance microwave absorbers

Yuan, Lei; Liu, Xiangxuan; Li, Rong; Wen, Wu; Wang, Xuanjun

doi:10.1039/c4ra15654d

Cited by 36 publications

(13 citation statements)

References 41 publications

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“…For example, the hybrid solution in which carbonyl iron particles were deposited on graphite [51] resulted in very good microwave absorption effectiveness. A similar effect was obtained in the case of the composite in the form of a carbon fiber core enveloped with a carbonyl iron shell [52].…”

Section: Discussionsupporting

confidence: 75%

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Methods of Protecting Buildings against HPM Radiation—A Review of Materials Absorbing the Energy of Electromagnetic Waves

et al. 2020

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The pulsed high power microwave (HPM) technology has been developed worldwide for over 20 years. The sources of HPM pulses are a weapon of mass destruction. They pose danger especially to computer and telecommunications equipment and systems, both the military and civilian ones. This paper presents a survey of literature on electromagnetic wave radiation absorbing and shielding materials to be used in construction. Relevant protective measures should include the shielding of buildings or their parts and the absorption of radiation by building envelopes and their elements. The main focus is on the possibilities of improving the shielding and absorptive properties of common construction materials, such as concrete, mortars and synthetic resins. The survey covers the following groups of materials: carbon-based admixtures, nickel powder, iron powders, ferrites, magnetite and polymers. The final part of the survey is devoted to hybrid foam microwave absorbers in which the shape of the material’s inner structure and that of its surface play a special role.

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Section: Discussionsupporting

confidence: 75%

“…Microwave radiation absorbing particles having a carbon fiber (CF) core enveloped with a carbonyl iron (CI) shell are described in [52]. In comparison with composites made of solely carbon fibers, this solution results in a significant improvement in microwave radiation absorbance.…”

Section: Iron Powdersmentioning

confidence: 99%

Methods of Protecting Buildings against HPM Radiation—A Review of Materials Absorbing the Energy of Electromagnetic Waves

et al. 2020

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“…In case of the composite without BFO (50:50:00) there is one big semicircle, showing the dielectric relaxation is due to PANI. In fact, the Cole‐Cole plot is a spiral in this case, suggesting that the dipole polarization is multiple Lorentz‐type . As we increase the BFO concentration form 0 to 8 wt% the number of approximate semicircles increased from 1 to 3 (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Mechanistic Insight into the Critical Concentration of Barium Hexaferrite and the Conductive Polymeric Phase with Respect to Synergistically Electromagnetic Interference (EMI) Shielding

et al. 2017

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We demonstrate the necessity of synergetic absorption and reflection in hard magnetic nanomaterial with conducting polymer for microwave absorption. We investigated various nanocomposites with varied concentrations of phase pure barium hexaferrite (BFO) and polyaniline (PANI) in wax matrix. We found a critical concentration of BFO (Wax: PANI: BFO::50:42:08 wt%, i.e., BFO composition below its percolation threshold) where the Ohmic, dielectric and magnetic losses for the nanocomposites were maximum giving a peak microwave attenuation of 99.85%, out of which 85% attenuation was due to absorption. Beyond this concentration, on either side, the shielding effectiveness decreased. An extraordinary synergy between absorption and reflection was observed when the thickness of the specimen was increased from 1 mm to just 3 mm. The underlying mechanism of synergy was explained via a structural model based on the complex permittivity and permeability values. Our model suggests the necessity of a critical concentration of magnetic materials in a conducting phase for enhancing the microwave absorption.

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“…The absorption of microwave radiationp enetrated inside the shield is mainly dependent on the attenuation constant (a) and can be expressed as: [45][46][47] a ¼ ffiffi ffi 2 p pf C ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi m 00 e 00 À m 0 e 0 ðÞ þ ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi m 00 e 00 À m 0 e 0 ðÞ 2 þ m 0 e 00 þ e 0 m 00 ðÞ 2 ðÞ q r ð7Þ Figure 9d shows a as af unctiono ff requency.I ti sc learly evidentt hat a for blends with MWNTs and rGO-Co is highest among the other blends studied here. Thisc onfirms the enhanced ability of this particular blend to absorb the microwave radiation.…”

Section: Microwaveabsorptioninp C/san Blendswith Mwntsand Rgo-co: Assmentioning

confidence: 99%

Extraordinary Synergy in Attenuating Microwave Radiation with Cobalt‐Decorated Graphene Oxide and Carbon Nanotubes in Polycarbonate/Poly(styrene‐co‐acrylonitrile) Blends

Pawar

Bose

2015

ChemNanoMat

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Polymeric nanocomposites were developed using polycarbonate( PC) and poly(styrene-co-acrylonitrile) (SAN) containing cobaltn anoparticles decorated onto partially reduced graphene oxide (rGO) sheetsa nd multiwalled carbon nanotubes (MWNTs). In order to absorb microwave radiations, the PC phase was rendered electrically conductingb y selectively localizing the MWNTsi nt he PC phase of the blends. The synergetic effect from the conducting phase (MWNTs), the dielectric phase (rGO), and the ferromagnetic phase (cobalt nanoparticles) on microwavea bsorption was assessed by measuring the scattering parameters using avector network analyzer coupled to acoaxial line. The electromagnetic interference (EMI) shielding effectiveness (SE) was studied over ab road range of frequencies including the X-band (8-12 GHz) and the K u -band (12-18GHz). Thiss trategy resulted in enhanced electrical conductivity and facilitated in outstanding microwavea bsorption. For instance, the PC/SAN blends with MWNTs manifested significantly high total shielding effectiveness (SE T )m ainly through absorption, in contrast to PC/MWNT composites for which reflection dominatedt he attenuation mechanism.T he interconnected network of MWNTsa nd cobalt-decorated r-GO (rGO-Co)r esulted in enhanced electrical conductivity and EMI shielding effectiveness (SE). This in turn resulted in as hielding effectivenesso fÀ34 dB at 18 GHz. The mechanism of EM wave absorption wass ystematically evaluated through detailed analysiso fr elative permittivity and permeability in the measured frequencyr egime. The absorption of EM radiation was noticeably enhanced due to high dielectric and large magnetic losses in the blendsc ontaining rGO-Co and MWNTs. Moreover,itw as also realized that the significantly enhanced attenuation constant resulted in maximum microwave absorptionint he blend containing MWNT and rGO-Co.

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Design and fabrication of carbon fiber/carbonyl iron core–shell structure composites as high-performance microwave absorbers

Abstract: Carbon fiber/carbonyl iron core–shell structure composites with excellent microwave absorbing performance were prepared by a metal organic chemical vapor deposition process.

Cited by 36 publications

References 41 publications

Methods of Protecting Buildings against HPM Radiation—A Review of Materials Absorbing the Energy of Electromagnetic Waves

Methods of Protecting Buildings against HPM Radiation—A Review of Materials Absorbing the Energy of Electromagnetic Waves

Mechanistic Insight into the Critical Concentration of Barium Hexaferrite and the Conductive Polymeric Phase with Respect to Synergistically Electromagnetic Interference (EMI) Shielding

Extraordinary Synergy in Attenuating Microwave Radiation with Cobalt‐Decorated Graphene Oxide and Carbon Nanotubes in Polycarbonate/Poly(styrene‐co‐acrylonitrile) Blends

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