Morphology-dependent electromagnetic wave absorbing properties of iron-based absorbers: one-dimensional, two-dimensional, and three-dimensional classification

2019 ◽  
Vol 87 (2) ◽  
pp. 20901 ◽  
Author(s):  
Zehao Zhao ◽  
Zirui Jia ◽  
Hongjing Wu ◽  
Zhenguo Gao ◽  
Yi Zhang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Low Cost ◽  
Impedance Matching ◽  
Three Dimensional ◽  
Microwave Absorbing Materials ◽  
Dimensional Classification ◽  
Absorbing Materials ◽  
Microwave Absorbing

Owing to the fast development of wireless techniques at the high-frequency range, the electromagnetic interference problem has been of increasing significance and attracting global attention. It is urgent to develop efficient microwave absorbing materials to attenuate the harmful electromagnetic wave. Iron and Fe-based composites are advantageous in the low-cost and attractive magnetic properties, so they have been widely studied in microwave absorption. This review focuses on the latest advances in nanostructured Fe-based materials including nanostructured iron, Fe/C (carbon nanotubes, nanofibers, nanocapsules, etc.), Fe/semiconductor (TiO2, MnO2, ZnO, SiO2, MoS2, etc.), Fe/polymer (polyaniline and polypyrrole), FeCo alloy, etc. However, most of these Fe-based materials suffer from the poor impedance matching and oxidation, which seriously impede their implementation as high-performance microwave absorbing materials. In this review, the main synthesis and modification methods, as well as the practical performance of Fe-based microwave absorbing materials are discussed. Moreover, challenges and perspectives of Fe-based composites for further development in microwave absorbing materials are proposed.

scholarly journals Tuning Dielectric Loss of SiO2@CNTs for Electromagnetic Wave Absorption

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2636
Author(s):  
Fenghui Cao ◽  
Jia Xu ◽  
Xinci Zhang ◽  
Bei Li ◽  
Xiao Zhang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
High Performance ◽  
Low Cost ◽  
Impedance Matching ◽  
3D Structure ◽  
Carbon Matrix ◽  
Current Approach ◽  
Matrix Composites ◽  
Simple Method ◽  
Absorption Performance

We developed a simple method to fabricate SiO2-sphere-supported N-doped CNTs (NCNTs) for electromagnetic wave (EMW) absorption. EMW absorption was tuned by adsorption of the organic agent on the precursor of the catalysts. The experimental results show that the conductivity loss and polarization loss of the sample are improved. Meanwhile, the impedance matching characteristics can also be adjusted. When the matching thickness was only 1.5 mm, the optimal 3D structure shows excellent EMW absorption performance, which is better than most magnetic carbon matrix composites. Our current approach opens up an effective way to develop low-cost, high-performance EMW absorbers.

scholarly journals Controlling the electric permittivity of honeycomb-like core–shell Ni/CuSiO3 composite nanospheres to enhance microwave absorption properties

RSC Advances ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 1172-1180 ◽  
Author(s):  
Rambabu Kuchi ◽  
Taha Latif ◽  
Sung Woo Lee ◽  
Viet Dongquoc ◽  
Phuoc Cao Van ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Impedance Matching ◽  
Core Shell ◽  
Electric Permittivity ◽  
Next Generation ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Microwave Absorbing

Controlling impedance matching and enhancing absorption properties are crucial for developing next-generation microwave absorbing materials.

scholarly journals Broadband microwave absorber constructed by reduced graphene oxide/La0.7Sr0.3MnO3 composites

RSC Advances ◽  
2019 ◽  
Vol 9 (71) ◽  
pp. 41817-41823 ◽  
Author(s):  
Kelan Yan ◽  
Feng Yin ◽  
Chao Pang ◽  
Xiuhui Zuo ◽  
Qitu Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Magnetic Loss ◽  
Impedance Matching ◽  
High Attenuation ◽  
Microwave Absorbing Materials ◽  
Reduced Graphene ◽  
Absorbing Materials ◽  
Electric Loss

High-performance microwave absorbing materials require optimized impedance matching and high attenuation ability. To meet these requirements, rGO/LSMO composites were prepared thereby incorporating electric loss with magnetic loss materials.

Core/shell structured C/ZnO nanoparticles composites for effective electromagnetic wave absorption

RSC Advances ◽  
2016 ◽  
Vol 6 (8) ◽  
pp. 6467-6474 ◽  
Author(s):  
Meikang Han ◽  
Xiaowei Yin ◽  
Sa Ren ◽  
Wenyan Duan ◽  
Litong Zhang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Zno Nanoparticles ◽  
High Performance ◽  
Impedance Match ◽  
Core Shell ◽  
Effective Strategy ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials

Core/shell structured C/ZnO nanoparticles composite exhibits an effective strategy to design high-performance microwave absorbing materials with adjustable impedance match.

Comparison Analysis of Absorption Properties for Microwave Absorbent

2012 ◽  
Vol 512-515 ◽  
pp. 1132-1135
Author(s):  
Xu Liang Lü ◽  
Chao Wu ◽  
Zhao Yang Zeng
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Fiber ◽  
Impedance Matching ◽  
Electromagnetic Parameter ◽  
Comparison Analysis ◽  
Absorption Properties ◽  
High Permittivity ◽  
X Band ◽  
Absorbing Materials ◽  
Microwave Absorbing

In order to compare the absorbing properties of different microwave-absorbing agents and their mixture, this paper has selected two typical microwave-absorbing agents which respectively are carbon fiber resistance microwave-absorbing agents and ferrite magnetism microwave-absorbing agents, and took them as monolayer absorbing materials. Then used MG formula to calculate the effective electromagnetic parameter of their mixture under different proportion at X band, and finally analyzed their absorbing properties separately. Then through contrasting the impedance matching characteristic and attenuation coefficient of the materials, it is proved that adding carbon fiber in ferrite can not improve absorption properties. Although the ability of attenuating electromagnetic wave would be enhanced when resistance materials and magnetism materials are blend with each other, doping will destroy the materials’ impedance matching characteristic because most resistance materials have high permittivity. It makes reflection strengthen and can not improve absorbing properties.

scholarly journals Facile approach of Ni/C composites from Ni/cellulose composites as broadband microwave absorbing materials

RSC Advances ◽  
2017 ◽  
Vol 7 (49) ◽  
pp. 31129-31132 ◽  
Author(s):  
Yun Wei ◽  
Xinxin Wang ◽  
Jingwei Zhang ◽  
Haojie Liu ◽  
Xiaoyan Lv ◽  
...  
Keyword(s):  
High Performance ◽  
Microwave Absorbing Materials ◽  
Cellulose Composites ◽  
Absorbing Materials ◽  
Microwave Absorbing

Ni/C composites were fabricated from nickel/cellulose composites via a facile in situ calcination approach, and could be used as high-performance MAMs.

Microwave Absorbing Properties of MnAlFe Magnetic Powder

2016 ◽  
Vol 852 ◽  
pp. 3-8 ◽  
Author(s):  
Ye Liu ◽  
Shun Kang Pan ◽  
Pei Hao Lin ◽  
Xing Liu ◽  
Li Chun Cheng
Keyword(s):  
Electromagnetic Interference ◽  
Permanent Magnets ◽  
High Energy ◽  
Absorption Peak ◽  
Absorption Properties ◽  
Microwave Absorbing Properties ◽  
Stealth Technology ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Microwave Absorbing

MnAlFe alloy was prepared by the combined use of smelting, high-energy ball milling and tempering heat treatment process. The phase composition and microwave absorbing properties of MnAlFe alloy were investigated by X-ray diffractometer(XRD) and vector network analyzer. The results show that the powders consist of Al8Mn5 single phase with different Fe content; the dielectric loss and the magnetic loss increases with the addition of Fe, the resonant frequency and absorption peak of ε″ and μ″ moves towardslower frequency region simultaneously. The (Al8Mn5)99Fe exhibits preferably comprehensive microwave absorbing properties in the range of 6-18 GHz. The value of the minimum reflectivity and absorption peak frequency with the coating thickness of 1.5 mm, are -23.1 dB, 15.04 GHz respectively. Owing to the wide applications of electromagnetic waves in the range of 1–4 GHz for mobile phone, local area network, radar systems and so on over the past few decades, the serious problems of the electromagnetic interference and electromagnetic compatibility have become increasingly prominent in recent years. Microwave absorbing materials, which possess special performance for absorbing electromagnetic wave, have been applied in both civil and military fields and play an important role in camouflage technology. In military field, stealth technology to reduce and eliminate the electromagnetic radiation and electromagnetic interference resulting from the broad applications of various kinds of electronic and microwave instruments, stealth technology plays an important strategic role in the wars in future[1-2]. The microwave absorbing materials can be used to reduce radar cross section for military use. For this reason, the microwave absorbing material is vitally important for both civil and military fields[3-7]. In view of this utilization, excellent microwave absorbing materials should exhibit strong microwave absorption properties over a wide frequency range and need to be thin and light in weight. It has an important meaning to the application of magnetic microwave absorbing materials. MnAl alloy can be used as microwave absorbent. It has properties such as light in weight, good thermal stability and corrosion resistance[8-11]. But as permanent magnets, MnAl has shortcomings such as their difficulties of fabrication and high costs that prevent them from being used as permanent magnets. A great value would be brought to either theory or practice through proper treatments as further improvement in properties. In this paper, we will discuss the effects of changing relative content of Fe on absorption properties of Al8Mn5 alloy.

Dual functions of glucose induced composition-controllable Co/C microspheres as high-performance microwave absorbing materials

Carbon ◽  
2020 ◽  
Vol 168 ◽  
pp. 404-414 ◽  
Author(s):  
Binhua Han ◽  
Wenlei Chu ◽  
Xijiang Han ◽  
Ping Xu ◽  
Dawei Liu ◽  
...  
Keyword(s):  
High Performance ◽  
Microwave Absorbing Materials ◽  
Absorbing Materials ◽  
Microwave Absorbing ◽  
Dual Functions
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