Fabrication and microwave absorption of carbon nanotubes∕CoFe2O4 spinel nanocomposite

C., R.; Chen, Zhi; Liang, Changhao; Zhou, Xiang

doi:10.1063/1.2165276

Cited by 518 publications

(228 citation statements)

References 19 publications

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“…Murugan et al [20] reported the microwave absorbing property of nanosized CaTiO 3 / epoxy resin composites where the maximum reflection loss is -30 dB at 8.5 GHz. X. Zhou et al [21] also reported the maximum reflection loss of -18 dB at 9 GHz for CNT-CoFe 2 O 4 nanocomposite, whereas, the maximum reflection loss for CNT and CoFe 2 O 4 is -6 dB and -8.3 dB respectively. Hence, the composite material, in combination with dielectric or magnetic component or both, is always a better microwave absorber than their individual component.…”

mentioning

confidence: 99%

Microwave absorption behaviour of MWCNT based nanocomposites in X-band region

Bhattacharya¹,

Sahoo²,

Das³

2013

Express Polym. Lett.

103

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Multiwall carbon nanotube (MWCNT) based nanocomposites were prepared by a two-step process. Firstly, titanium dioxide (TiO2) coated MWCNT was prepared via sol-gel technique. In the second step, the acid modified MWCNTs were dispersed in the thermoplastic polyurethane matrix by solution blending process. Characterizations of the nanocomposites were done by X-ray diffraction analysis, X-ray photoelectron spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscopy and Energy-dispersive X-ray spectroscopy. Microwave absorption studies of the nanocomposites were carried out in X-band region. The microwave absorption result was discussed with the help of complex permittivity and permeability of the prepared radar absorbing material (RAM). The result showed superior microwave absorption property of the composite containing both TiO2 coated MWCNT and magnetite (Fe3O4). This result is due to the effective absorption of both electrical and magnetic components of the microwave. RAM-MW, RAM-Ti, RAM-Ti@MW and RAMTi@ MW/Fe and showed the maximum reflection loss of –16.03 dB at 10.99 GHz, –8.4 dB at 12.4 GHz, –36.44 dB at 12.05 GHz and –42.53 dB at 10.98 GHz respectively. Incorporation of MWCNT enhanced the thermal stability of the composite which has been confirmed by thermogravimetric analysis

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mentioning

confidence: 99%

Microwave absorption behaviour of MWCNT based nanocomposites in X-band region

Bhattacharya¹,

Sahoo²,

Das³

2013

Express Polym. Lett.

103

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“…Che et al (2004Che et al ( , 2006 have reported that magnetic nanoparticles/carbon nanotubes (CNTs) exhibited improved microwave absorption properties because of their proper EM matching between the dielectric loss and the magnetic loss.…”

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

2014

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To improve electromagnetic shielding effectiveness of light weight carbon foam (CF), magnetic nanoparticles were embedded in it during processing. The CF was developed from the coal tar pitch and mixture of coal tar pitch-Nickel (Ni) nanoparticles by sacrificial template technique and heat treated to up 1,000°C. To ascertain the effect of Ni nanoparticles embedded in CF, it was characterized by scanning electron microscopy, X-ray diffraction, Raman spectroscopy, vector network analyzer and vibration sample magnetometer. It is observed that Ni nanoparticles embedded in the carbon material play an important role for improving the structure and electrical conductivity of CF-Ni by catalytic carbonization. The structural investigation suggests that the Ni nanoparticles embedded in the carbon material in bulk as well on the surface of CF. The CF demonstrates excellent shielding response in the frequency range 8.2-12.4 GHz in which total shielding effectiveness (SE) dominated by absorption losses. The total SE is -25 and -61 dB of CF and CF-Ni, it is governed by absorption losses -48.5 dB in CF-Ni. This increase is due to the increase in dielectric and magnetic losses of ferromagnetic Ni nanoparticles with high surface area. Thus, light weight CF embedded with small amount of magnetic nanoparticles can be useful material for stealth technology.

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“…Moreover, the bandwidth with the reflection loss below 20 dB ranges from 4.3 to 17.4 GHz, and its value is up to 13.1 GHz for the NW composites with a thickness of 2-5 mm. The EM absorption properties of these Fe 3 O 4 composites are better than those of ZnO nanowires reported in our previous literature and CNT/CoFe 2 O 4 nanocomposites [3,4]. Therefore, the porous Fe 3 O 4 sub-micro particles obtained in this work are attractive candidates for EM wave absorptive materials.…”

Section: Resultsmentioning

confidence: 56%

Controlled synthesis and shape-dependent electromagnetic wave absorption characteristics of porous Fe3O4 sub-micro particles

Chen

Zhang

Xiao

et al. 2011

Sci. China Phys. Mech. Astron.

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Porous Fe 3 O 4 sub-micro particles with sphere-like, cube-like and walnut-like morphologies were obtained by a two-step process, and the electromagnetic properties of the Fe 3 O 4 particle/wax composites were investigated. The reflect loss was less than 20 dB for all of the composites in different frequency ranges. The cube-like and walnut-like Fe 3 O 4 composites exhibit improved complex permittivity and permeability and dual-frequency and wide bandwidth absorption characteristics, which is mainly attributed to the larger shape anisotropy. Such a high absorption property indicates that these porous Fe 3 O 4 particles with various morphologies are very promising for electromagnetic wave absorptive materials. magnetic materials, electromagnetic absorption, magnetic properties, crystal structure PACS number(s): 77.22.Gm, 73.63.Bd, 71.20.Nr Citation: Chen Y J, Zhang Y, Xiao G, et al. Controlled synthesis and shape-dependent electromagnetic wave absorption characteristics of porous Fe 3 O 4 sub-micro particles.

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Fabrication and microwave absorption of carbon nanotubes∕CoFe2O4 spinel nanocomposite

Cited by 518 publications

References 19 publications

Microwave absorption behaviour of MWCNT based nanocomposites in X-band region

Microwave absorption behaviour of MWCNT based nanocomposites in X-band region

Nickel nanoparticles embedded in carbon foam for improving electromagnetic shielding effectiveness

Controlled synthesis and shape-dependent electromagnetic wave absorption characteristics of porous Fe3O4 sub-micro particles

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