Construction of hierarchical SnO2@Fe3O4 nanostructures for efficient microwave absorption

Deng, Zhouhu; He, Shaorui; Wang, Wei; Xu, Manzhang; Zheng, Hanyu; Zhang, Wanxu; Yun, Jiangni; Zhao, Wenguang; Gan, Peiyuan

doi:10.1016/j.jmmm.2019.166224

Cited by 31 publications

(7 citation statements)

References 29 publications

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“…However, its direct use is difficult because of an impedance mismatch and poor antioxidation. Therefore, to solve this problem, magnetite can be combined with dielectric materials, such as SiO 2 , ZnO, SnO 2 , and MnO 2 [7][8][9][10][11]. The results indicate that the synergistic action between magnetite and dielectric substance enhances microwave absorption performance, reducing the absorbing thickness of the materials.…”

Section: Introductionmentioning

confidence: 99%

Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag

Yan

Shen

et al. 2020

Materials

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The utilization of nickel slag has attracted much attention due to its high-content of valuable elements. As a part of these efforts, this work focuses on whether magnetite crystals, obtained from nickel slag via molten oxidation, magnetic separation, and ball-milling can be used as a microwave absorber. The composition, morphology, microstructure, magnetic properties, and microwave absorption performance were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and vector network analysis (VNA). The results reveal that the magnetite crystals exhibit excellent microwave absorption properties because of the synergistic action between dielectric loss and magnetic loss. The minimum reflection loss (RL) of the particles obtained after 6 h ball-milling reaches −34.0 dB at 16.72 GHz with thickness of 5 mm. The effective frequency bandwidth (RL ≤ −10 dB) is 4.8–5.4 GHz and 15.9–17.6 GHz. Interfacial polarization of the particles could play a crucial role in improving absorbing properties because several components contained in the particles can dissipate electromagnetic wave effectively. The current study could show great potential in the preparation of magnetite crystals and utilization of nickel slag.

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Section: Introductionmentioning

confidence: 99%

Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag

Yan

Shen

et al. 2020

Materials

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“…A,C,E) and SEM (B,D,F) images of carbonization products of Fe3O4@RF microspheres with different shell thicknesses: Fe3O4@C-6, Fe@C-10 and Fe@C-12. 220), (311), (400), ( 422), ( 511) and (440) in the face-centered cubic lattice [27,28]. This showed that Fe 3 O 4 had not been reduced at this time.…”

Section: Morphology and Structure Of Rattle-shaped Fe@c Composite Mic...mentioning

confidence: 92%

“…peaks of the Fe3O4@RF-6 carbonization products at 18.3°, 30.1°, 35.5°, 43.1°, 53.4°, 57.1° and 62.8° corresponded to the inverse spinel structure Fe3O4 (JCPDS75-0033) crystal faces of (111), ( 220), (311), (400), ( 422), ( 511) and (440) in the face-centered cubic lattice [27,28]. This showed that Fe3O4 had not been reduced at this time.…”

Section: E F D C B Amentioning

confidence: 99%

Controllable Preparation of Fe3O4@RF and Its Evolution to Yolk–Shell-Structured Fe@C Composite Microspheres with High Microwave Absorbing Performance

Xue¹,

Lou²,

Yang³

2022

Coatings

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Fe3O4@RF microspheres with different phenolic (RF) layer thicknesses are prepared by adjusting the polymerization time. With the prepared Fe3O4@RF as the precursor, Fe@C composite microspheres with rattle-like morphology are obtained through one-step controlled carbonization. This method simplifies the preparation of rattle-shaped microspheres from sandwich microspheres. Fe@C microspheres exhibit excellent microwave absorbing properties. The morphology and composition of the product are investigated depending on the effects of carbonization temperature, time and thickness of the RF layer. When the carbonization temperature is 700 °C, the carbonization time is 12 h and the polymer shell thickness is 62 nm, the inner hollow Fe3O4 is completely reduced to Fe. The absorption properties of the materials are compared before and after the reduction of Fe3O4. Both Fe@C-12 and Fe3O4@C-700 show excellent absorbing properties. When the filler content is 50%, the maximum reflection loss (RLmax) of the rattle-shaped Fe@C microspheres is −50.15 dB, and the corresponding matching thickness is 3.5 mm. At a thickness of 1.7 mm, the RLmax of Fe3O4@C-700 is −44.42 dB, which is slightly worse than that of Fe@C-12. Both dielectric loss and magnetic loss play a vital role in electromagnetic wave absorption. This work prepares rattle-shaped absorbing materials in a simple way, which has significance for guiding the construction of rattle-shaped materials.

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“…These are carbon-based materials 5 (graphene and carbon nanotubes), ferromagnetic metals 5 and their composites (CoFe@Ti 3 C 2 T x , 14 Fe 3 O 4 @g–C 3 N 4 , 15 and NiCrAlY/Al 2 O 3 16 ), ceramic materials (BaTiO 3 , SiO 2 , SiC, and TiO 2 ), wide bandgap semiconductors 6 (zinc oxide (ZnO)), metal–organic framework materials, and conducting polymer composites. 1,6,7 And also, according to their molding methods and working performance, MAMs can be prepared in various forms such as in the shape of bricks, paints or sheets, and thin films. 17–19 Such products are typically obtained through the application of one or more forms of absorbent fillers in a polymeric or rubber matrix.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Thus, researches focus on efficient microwave absorbing materials (MAMs) that have played a significant role in radar systems, satellite communications, wireless networks, and protection of living beings from the harmful action of electromagnetic waves. [3][4][5][6][7] Radio detection and ranging system, radar, is basically an electromagnetic system used to detect the location and distance of an object from the point where it is placed. The mechanism is based on electromagnetic waves and calculations.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing radar-absorbing composite materials by using magnetic Co-doped zinc oxide particles synthesized by Sol-Gel

Atay

İçin

2020

Journal of Composite Materials

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An indicator of being a strong country in today's world is that they have powerful weapons. In this sector where science is used exceedingly, the “stealth” takes an important place. Radar-absorbing materials are used in stealth technology to disguise an object from radar detection, such that it can allow a plane to be perceived as a bird. In this study, Co-doped zinc oxide reinforced styrofoam sheet composites were manufactured as radar-absorbing materials. For this purpose, Co-doped zinc–ZnO particles were synthesized via the Sol-Gel method with doping concentrations of 0%, 3%, 6%, 9%, and 12%. They were embedded in a styrofoam matrix with different loading levels to see the concentration dependence. The as-prepared powders were characterized by using X-ray diffraction and Scanning Electron Microscope-Energy Dispersive Spectroscopy. Magnetic characterization of samples was carried out using a vibrating sample magnetometer. Finally, the radar-absorbing test was applied with a network analyzer to achieve the main purpose of this research. It was concluded that Co-doped zinc oxide reinforced composites have electromagnetic properties that indicate potential applications in the radar-absorbing area.

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Construction of hierarchical SnO2@Fe3O4 nanostructures for efficient microwave absorption

Cited by 31 publications

References 29 publications

Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag

Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag

Controllable Preparation of Fe3O4@RF and Its Evolution to Yolk–Shell-Structured Fe@C Composite Microspheres with High Microwave Absorbing Performance

Manufacturing radar-absorbing composite materials by using magnetic Co-doped zinc oxide particles synthesized by Sol-Gel

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