Preparation and electromagnetic properties characterization of reduced graphene oxide/strontium hexaferrite nanocomposites

Du, Shumin; Chen, Huaiyin; Hong, Ruoyu

doi:10.1515/ntrev-2020-0010

Cited by 34 publications

(8 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, as shown in Figure 10a, d, the magnetic loss tangent of the 3 h sample was larger than the dielectric loss tangent, indicating that microwave absorption was mostly due to the magnetic effect. Magnetic loss has a very significant effect on the absorption of electromagnetic waves, as electromagnetic energy is converted into heat energy with magnetic loss to enhance the absorption of electromagnetic waves [79]. However, here, the dielectric loss followed an increasing trajectory for the 12 h milled sample in the frequency range above 12 GHz and then again suffered a significant decrease.…”

Section: Loss Tangentmentioning

confidence: 72%

“…Because of different particle sizes caused by milling, defects and voids were produced by lattice deformation, leading to an inconsistency of charges, which changed the capacitance of the samples. Therefore, these defects play an important role in increasing the grain boundaries of milled samples and thus promoting space charge polarization, which leads to grains with high conductivity being separated by grain borders with low conductivity [79]. Space charge polarization leads to changes in the dielectric loss, which depends on the capacitance of samples [80].…”

Section: Loss Tangentmentioning

confidence: 99%

See 1 more Smart Citation

Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

et al. 2021

View full text Add to dashboard Cite

This study presents the utilization of mill scale waste, which has attracted much attention due to its high content of magnetite (Fe3O4). This work focuses on the extraction of Fe3O4 from mill scale waste via magnetic separation, and ball milling was used to fabricate a microwave absorber. The extracted magnetic powder was ground-milled using two different techniques: (i) a conventional milling technique (CM) and (ii) mechanical alloying (MM) process. The Fe3O4/CM samples were prepared by a conventional milling process using steel pot ball milling, while the Fe3O4/MM samples were prepared using a high-energy ball milling (HEBM) method. The effect of milling time on the structural, phase composition, and electromagnetic properties were examined using X-ray diffraction (XRD) and a vector network analyzer (VNA). XRD confirmed the formation of magnetite after both the magnetic separation and milling processes. The results revealed that Fe3O4 exhibited excellent microwave absorption properties because of the synergistic characteristics of its dielectric and magnetic loss. The results showed that the Fe3O4/CM particle powder had a greater absorption power (reflection loss: <−10 dB) with 99.9% absorption, a minimum reflection loss of −30.83 dB, and an effective bandwidth of 2.30 GHz for 2 mm thick samples. The results revealed the Fe3O4/MM powders had higher absorption properties, including a higher RL of −20.59 dB and a broader bandwidth of 2.43 GHz at a matching thickness of only 1 mm. The higher microwave absorption performance was attributed to the better impedance matching property caused by the porous microstructure. Furthermore, the magnetite, Fe3O4 showed superior microwave absorption characteristics because of the lower value of permittivity, which resulted in better impedance matching. This study presents a low-cost approach method by reutilizing mill scale waste to fabricate a high purity crystalline Fe3O4 with the best potential for designing magnetic nano-sized based microwave absorbers.

show abstract

Section: Loss Tangentmentioning

confidence: 72%

Section: Loss Tangentmentioning

confidence: 99%

Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Electromagnetic radiation and noise pollution are two of the four major environmental pollution sources listed by the WHO (World Health Organization) . Both of them are invisible pollution that can seriously endanger human health. , On the other hand, with the scientific progress in electronics and the enhancement of the military strength, various military reconnaissance technologies have emerged endlessly.…”

Section: Introductionmentioning

confidence: 99%

Combinatorial Structural Engineering of Multichannel Hierarchical Hollow Microspheres Assembled from Centripetal Fe/C Nanosheets to Achieve Effective Integration of Sound Absorption and Microwave Absorption

Su-su

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Electromagnetic radiation and noise pollution are two of the four major environmental pollution sources. Although various materials with excellent microwave absorption performances or sound absorption properties have been manufactured, it is still a great challenge to design materials with both microwave absorption and sound absorption abilities due to different energy consumption mechanisms. Herein, a combination strategy based on structural engineering was proposed to develop bi-functional hierarchical Fe/C hollow microspheres composed of centripetal Fe/C nanosheets. Both of the interconnected channels created by multiple gaps among the adjacent Fe/C nanosheets and the hollow structure have positive effects on the absorbing performances by promoting the penetration of microwaves and acoustic waves and prolonging action time between microwave energy and acoustic energy with materials. In addition, a polymer-protection strategy and a high-temperature reduction process were applied to keep this unique morphology and further improve the performances of the composite. As a result, the optimized hierarchical Fe/C–500 hollow composite exhibits a wide effective absorption bandwidth of 7.52 GHz (10.48–18.00 GHz) at only 1.75 mm. Furthermore, the Fe/C–500 composite can effectively absorb sound wave in the frequency of 1209–3307 Hz, basically including part of the low frequency range (<2000 Hz) and most of the medium frequency range (2000–3500 Hz), and has 90% absorption of sound at 1721–1962 Hz. This work puts new insight into the engineering and development of microwave absorption–sound absorption-integrated functional materials with promising applications.

show abstract

“…For example, Co/rGO is simply synthesized by hydrothermal method [19], and Fe-hybridized rGO is achieved through primitive chemical reduction [20]. However, these hybrids exhibit improved but uncontrollable MA performances due to the single component of magnetic particles [21,22]. Subsequently, multi-component metal (McM) compounds are used for constructing graphene-based nanostructures, achieving a tunable MA performance [23,24].…”

Section: Introductionmentioning

confidence: 99%

Improved impedance matching by multi-componential metal-hybridized rGO toward high performance of microwave absorption

Xie

Jiang

et al. 2021

Nanotechnology Reviews

View full text Add to dashboard Cite

Microwave-absorbing materials with good microwave absorption performance are of great interest for military applications and human health, which is threatened by electromagnetic radiation pollution. Herein, the design and synthesis of multi-componential metal-hybridized graphene composites via freeze drying and pyrolysis of ferrocene hydrazone complex precursor are reported. Various magnetic nanoparticles are loaded on reduced graphene oxide (rGO) via controlling their pyrolysis temperature. The complex electromagnetic parameters of these hybrids are therefore regulated by the hybrid components. Among them, rGO hybridized by the sea-island-like Fe2O3/Fe3O4/FeNi3 multi-componential metals shows a good balance of dielectric and magnetic constants. Thus, the improved impedance matching with free space brings about a superior electromagnetic wave absorption performance, especially on the effective absorption bandwidth. The minimum reflection loss (RL) of the hybrids is as low as −40.3 dB at 11 GHz with the RL bandwidth of −10 dB being 4.55 GHz (from 9.25 to 13.8 GHz).

show abstract

Preparation and electromagnetic properties characterization of reduced graphene oxide/strontium hexaferrite nanocomposites

Cited by 34 publications

References 46 publications

Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

Combinatorial Structural Engineering of Multichannel Hierarchical Hollow Microspheres Assembled from Centripetal Fe/C Nanosheets to Achieve Effective Integration of Sound Absorption and Microwave Absorption

Improved impedance matching by multi-componential metal-hybridized rGO toward high performance of microwave absorption

Contact Info

Product

Resources

About