(Fe, Ni)/C nanocapsules for electromagnetic-wave-absorber in the whole Ku-band

Liu, X.G.; Li, B.; Geng, D. Y.; Cui, Wei; Yang, Fang; Xie, Zhiqiang; Kang, D. J.; Zhang, Z.D.

doi:10.1016/j.carbon.2008.10.028

Cited by 318 publications

(209 citation statements)

References 17 publications

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“…An optimal RL value of -40.0 dB, corresponding to 99.99 % absorption, is observed at 10.52 GHz for a layer 1.9 mm thickness. It is worth noting that the absorbent with a thickness of 1.1 mm has RL values exceeding -20 dB at high frequencies in broad frequency ranges, which is thinner than the previous reported results [3][4][5][8][9][10][16][17][18][19][20][25][26][27] . As shown in Figure 3b, for all frequencies within the 1-18 GHz range, RL values exceeding -20 dB can be obtained by selecting an appropriate thickness of the absorbent layer between 1.1 and 10.0 mm.…”

Section: As Shown Incontrasting

confidence: 65%

“…Moreover, from the HRTEM of Figure 1c, it is clearly noted that the whole surface of the nanoparticles is coated by a graphitic multi-layered carbon shell around 1-2 nm in thickness, which is thinner than that of carbon-coated Fe, Ni or Sn nanocapsules 3,10 . The interplaner spacing of 0.34 nm in the coating is approximately close to that of the bulk graphite (002) plane, which is accordance with the previous results 2, 3,10 . Moreover, it can be found that many lattice defects occur in the carbon shell, including collapses, unevenness, dislocations, etc.…”

Section: Methodsmentioning

confidence: 97%

“…Transmission electron microscopy (TEM) and high-resolution TEM (HRTEM) images were obtained on a JEOL JEM-2010 transmission electron microscope at an acceleration voltage of 200 kV. The paraffin-Cu nanocapsules composite was prepared by uniformly mixing Cu nanocapsules with paraffin, as described in detail elsewhere [2][3][4][5][6][7][8][9][10][16][17][18][19][20] , by homogeneously mixing the nanocapsule with paraffin and pressing them into cylindershaped compacts. Then the compact was cut into toroidal shape with 7.00 mm outer diameter and 3.04 mm inner diameter.…”

Section: Methodsmentioning

confidence: 99%

“…Carbon-coated Cu nanocapsules were prepared by an arc discharge method in a methane (CH 4 ) atmosphere, in which the special microstructures with graphite shells and Cu cores result in a high relative complex permittivity and dielectric loss, exhibiting promising application as a new type of EM wave shield/absorbent 2 . On the other hand, the graphite shells are outstanding microwave absorption materials due to their dielectric properties, which play an important role in improving the disperse properties of nanocapsules 9,10 . Actually, Cu nanoparticles possess many good properties such as electric, optical, thermal and lubricating, etc [11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules

Sun

Liu

et al. 2014

Mat. Res.

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The microstructure and microwave absorption of carbon-coated Cu nanocapsules have been investigated. Carbon-coated Cu nanocapsules have been synthesized by an arc-discharge method. The paraffin-Cu/C nanocapsules composite shows excellent electromagnetic (EM) absorption properties. An optimal reflection loss (RL) value of -40.0 dB is reached at 10.52 GHz for a layer 1.9 mm thickness. RL exceeding -20 dB can be realized in any interval within the 1-18 GHz range by choosing an appropriate thickness of the absorbent layer between 1.1 and 10.0 mm. Theoretical simulation for the microwave absorption using the transmission line theory agrees reasonably well with the experimental results. The EM-wave absorption properties of nanocapsules materials are illustrated by means of an absorption-tube-map. The carbon-coated Cu nanocapsule is an attractive candidate for EM-wave absorption, which significantly enriches the family of EM-wave nanoabsorbents.

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Section: As Shown Incontrasting

confidence: 65%

Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules

Sun

Liu

et al. 2014

Mat. Res.

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“…With an increase in substitution of Co-Ti ions in strontium ferrite more Fe 3+ ions transform to Fe 2+ ions. The Fe 2+ ions result in the polarization on the sample surface, causing the increase of dielectric constant (ε ) [14].…”

Section: Resultsmentioning

confidence: 99%

Complex permittivity, permeability and microwave absorbing properties of Co–Ti substituted strontium hexaferrite

Narang

Kaur

Bahel

2016

Materials Science-Poland

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M-type strontium ferrite with compositions SrFe (12−2x) Co x Ti x O 19 (x = 0.0, 0.3, 0.5, 0.7, 1.0), were prepared by two route ceramic method. The effects of Co-Ti substitution on their microstructure, electromagnetic properties, and microwave absorptive behavior were analyzed. The complex permittivity (ε -jε ) and complex permeability (µ -jµ ) have been measured from 8.2 to 12.4 GHz using a network analyzer. Scanning electron microscope was used to analyze the grain size distribution and porosity of the ferrite. X-ray diffraction confirmed the M-type structure of the doped strontium ferrite. Vibrating sample magnetometer was used to study hysteresis loop of the ferrite. This study suggests that the control of grain size, decrease in coercivity and enhanced values of dielectric constant and loss are effective means to improve microwave absorption. The dielectric constant and loss were enhanced in comparison to the permeability constant and loss over the entire frequency range.

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Toward the Application of High Frequency Electromagnetic Wave Absorption by Carbon Nanostructures

et al. 2019

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With the booming development of electronic information technology, the problems caused by electromagnetic (EMs) waves have gradually become serious, and EM wave absorption materials are playing an essential role in daily life. Carbon nanostructures stand out for their unique structures and properties compared with the other absorption materials. Graphene, carbon nanotubes, and other special carbon nanostructures have become especially significant as EM wave absorption materials in the high‐frequency range. Moreover, various nanocomposites based on carbon nanostructures and other lossy materials can be modified as high‐performance absorption materials. Here, the EM wave absorption theories of carbon nanostructures are introduced and recent advances of carbon nanostructures for high‐frequency EM wave absorption are summarized. Meanwhile, the shortcomings, challenges, and prospects of carbon nanostructures for high‐frequency EM wave absorption are presented. Carbon nanostructures are typical EM wave absorption materials being lightweight and having broadband properties. Carbon nanostructures and related nanocomposites represent the developing orientation of high‐performance EM wave absorption materials.

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(Fe, Ni)/C nanocapsules for electromagnetic-wave-absorber in the whole Ku-band

Cited by 318 publications

References 17 publications

Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules

Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules

Complex permittivity, permeability and microwave absorbing properties of Co–Ti substituted strontium hexaferrite

Toward the Application of High Frequency Electromagnetic Wave Absorption by Carbon Nanostructures

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