Dependency of tunable microwave absorption performance on morphology-controlled hierarchical shells for core-shell Fe3O4@MnO2 composite microspheres

Qiao, Mingtao; Lei, Xingfeng; Ma, Yong; Tian, Lidong; Su, Kehe; Zhang, Qiuyu

doi:10.1016/j.cej.2016.06.094

Cited by 169 publications

(32 citation statements)

References 50 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Specifically, Du et al and Che et al undertook far-reaching investigations, such as core-shell Fe 3 O 4 @C (−40.0 dB, 14.0-17.9 GHz) [5], Fe 3 O 4 @PANI (−37.4 dB, 10.1-14.3 GHz) [6], Fe 3 O 4 @TiO 2 (−23.3 dB) [7], Fe 3 O 4 @ PEDOT (−31.4 dB, 3.8-5.2 GHz) [8], CoNi@SiO 2 @TiO 2 (−58.2 dB, 8.0-16.1 GHz) [9], Co 20 Ni 80 @TiO 2 (−25.0 dB, 10.0-16.2 GHz) [10], and Co@C (−68.7 dB) [11]. Our group also obtained core-shell Fe 3 O 4 @PPy [12] and hierarchical core-shell Fe 3 O 4 @MnO 2 absorbents [13], both of which exhibit strong microwave absorption capabilities. In addition, given their unique features such as low density, large surface area, designable interspaces, and functional interfaces, special core@ void@shell structures, known as yolk-shell structures, are superior in terms of microwave absorption over typical core-shell structures.…”

Section: Introductionmentioning

confidence: 54%

Application of yolk–shell Fe3O4@N-doped carbon nanochains as highly effective microwave-absorption material

et al. 2018

Self Cite

View full text Add to dashboard Cite

Yolk-shell Fe 3 O 4 @N-doped carbon nanochains, intended for application as a novel microwave-absorption material, have been constructed by a three-step method. Magnetic-field-induced distillation-precipitation polymerization was used to synthesize nanochains with a one-dimensional (1D) structure. Then, a polypyrrole shell was uniformly applied to the surface of the nanochains through oxidant-directed vapor-phase polymerization, and finally the pyrolysis process was completed. The obtained products were characterized by X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), and thermogravimetric analyses (TGA) to confirm the compositions. The morphology and microstructure were observed using an optical microscope, scanning electron microscope (SEM), and transmission electron microscope (TEM). The N 2 absorption-desorption isotherms indicate a Brunauer-Emmett-Teller (BET) specific surface area of 74 m 2 /g and a pore width of 5-30 nm. Investigations of the microwave absorption performance indicate that paraffin-based composites loaded with 20 wt.% yolk-shell Fe 3 O 4 @N-doped carbon nanochains possess a minimum reflection loss of −63.09 dB (11.91 GHz) and an effective absorption bandwidth of 5.34 GHz at a matching layer thickness of 3.1 mm. In addition, by tailoring the layer thicknesses, the effective absorption frequency bands can be made to cover most of the C, X, and Ku bands. By offering the advantages of stronger absorption, broad absorption bandwidth, low loading, thin layers, and intrinsic light weight, yolk-shell Fe 3 O 4 @N-doped carbon nanochains will be excellent candidates for practical application to microwave absorption. An analysis of the microwave absorption mechanism reveals that the excellent microwave absorption performance can be explained by the quarter-wavelength cancellation theory, good impedance matching, intense conductive loss, multiple reflections and scatterings, dielectric loss, magnetic loss, and microwave plasma loss.

show abstract

Section: Introductionmentioning

confidence: 54%

Application of yolk–shell Fe3O4@N-doped carbon nanochains as highly effective microwave-absorption material

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…The Fe 3 O 4 @C nanocomposite has a sheet‐like structure. This nanocomposite is different from that with spherical structure from other methods [3, 4]. It is possibly due to the water environment with low carbon concentration and short reaction time.…”

Section: Resultsmentioning

confidence: 81%

“…1. Introduction: Fe 3 O 4 -based core/shell composites as multi-functional materials have been used in many fields due to their unique properties, such as energy storage, pollution absorption, photothermal therapies and microwave absorption [1][2][3][4]. Various shell materials were used including carbon, metals, metal oxides, SiO 2 and polymer.…”

mentioning

confidence: 99%

Facile preparation and dye removal properties of Fe ₃ O ₄ @carbon nanocomposite

Kong

Liu

et al. 2018

Micro & Nano Letters

View full text Add to dashboard Cite

Fe 3 O 4 @carbon nanocomposite (Fe 3 O 4 @C) was continuously prepared by combining microreactor with pyrolysis reactor. The Fe 3 O 4 nanoparticles homogeneously disperse in the carbon matrix with an average size of about 9.2 nm and narrow size distribution. The Fe 3 O 4 @C nanocomposite has a Brunauer-Emmett-Teller specific surface area of 71.9 m 2 /g and total pore volume of 0.37 cm 3 /g. This nanocomposite has a saturation magnetisation value of 16 emu/g and could be easily separated from water by an external magnet. With the increase of pH value or temperature, the Rhodamine B absorbing capacity of the Fe 3 O 4 @C nanocomposite first increases and then decreases after a certain value. The absorbing capacity at pH value 9 is about 169 mg/g when the temperature is 20°C. The above said value also exceeds 150 mg/g at pH value 3. The capacity is still higher than 120 mg/g after four regenerations. The absorbing capacity even reaches to 184 mg/g at 60°C of the absorbing temperature.

show abstract

“…On the contrary, the worst impedance matching ratio and the highest α value of Sample A (20 wt %) mainly resulted from its comparatively highest complex permittivity, which can be proved by the analysis in Figure 6. Attenuation capability and impedance matching are two key factors which should be considered to realize optimal EA materials [48]. Therefore, Sample B and Sample C, which had moderate attenuation constant values and impedance matching ratios can be deduced as qualified electromagnetic absorbers.…”

Section: Resultsmentioning

confidence: 99%

Direct Growth of a Polypyrrole Aerogel on Hollow CuS Hierarchical Microspheres Yields Particles with Excellent Electromagnetic Wave Properties

Zhou

Cui

et al. 2018

Polymers

View full text Add to dashboard Cite

A current hot topic in polymer science is the development of electromagnetic wave-absorbing materials with desired properties (i.e., proper impedance matching and strong attenuation capability), but it presents a considerable challenge. In this work, solvothermal, and self-assembled polymerization were employed for the controlled fabrication of a uniform polypyrrole (PPy) aerogel coated on hollow CuS hierarchical microspheres (CuS@PPy). The PPy coating thickness of the heterostructure could be tuned by varying the feeding weight ratios of CuS/pyrrole monomer. The electromagnetic wave absorption properties of the CuS@PPy composites were estimated to be in the frequency range 2–18 GHz. The as-prepared Sample B (fabricated by the addition of 35 mg CuS) showed a maximum reflection loss (RL) of −52.85 dB at a thickness of 2.5 mm. Moreover, an ultra-wide effective bandwidth (RL ≤ −10 dB) from 9.78 to 17.80 GHz (8.02 GHz) was achieved. Analysis of the electromagnetic properties demonstrated that the CuS@PPy had a remarkable enhancement compared to pure CuS platelet-based spheres and pure PPy, which can be attributed to the increased relatively complex permittivity and the promoted dielectric loss by the intense interfacial dielectric polarizations. We believe that the as-fabricated CuS@PPy can be a good reference for the fabrication of lightweight and optimal broadband absorbers.

show abstract

Dependency of tunable microwave absorption performance on morphology-controlled hierarchical shells for core-shell Fe3O4@MnO2 composite microspheres

Cited by 169 publications

References 50 publications

Application of yolk–shell Fe3O4@N-doped carbon nanochains as highly effective microwave-absorption material

Application of yolk–shell Fe3O4@N-doped carbon nanochains as highly effective microwave-absorption material

Facile preparation and dye removal properties of Fe ₃ O ₄ @carbon nanocomposite

Direct Growth of a Polypyrrole Aerogel on Hollow CuS Hierarchical Microspheres Yields Particles with Excellent Electromagnetic Wave Properties

Contact Info

Product

Resources

About

Dependency of tunable microwave absorption performance on morphology-controlled hierarchical shells for core-shell Fe3O4@MnO2 composite microspheres

Cited by 169 publications

References 50 publications

Application of yolk–shell Fe3O4@N-doped carbon nanochains as highly effective microwave-absorption material

Application of yolk–shell Fe3O4@N-doped carbon nanochains as highly effective microwave-absorption material

Facile preparation and dye removal properties of Fe 3 O 4 @carbon nanocomposite

Direct Growth of a Polypyrrole Aerogel on Hollow CuS Hierarchical Microspheres Yields Particles with Excellent Electromagnetic Wave Properties

Contact Info

Product

Resources

About

Facile preparation and dye removal properties of Fe ₃ O ₄ @carbon nanocomposite