A novel MOF-drived self-decomposition strategy for CoO@N/C-Co/Ni-NiCo2O4 multi-heterostructure composite as High-Performance Electromagnetic Wave Absorbing Materials

2021 ◽  
pp. 131667
Author(s):  
Wei Wang ◽  
Han Zhang ◽  
Yazhen Zhao ◽  
Junnan Wang ◽  
Huiting Zhao ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
High Performance ◽  
Absorbing Materials

Enhanced Electromagnetic Wave Absorption of Magnetic Co Nanoparticles/CNTs/EG Porous Composites with Waterproof, Flame-retardant and Thermal Management Functions

2021 ◽  
Author(s):  
Zhen Xiang ◽  
Xiaojie Zhu ◽  
Yanyan Dong ◽  
Xiang Zhang ◽  
Yuyang Shi ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Thermal Management ◽  
High Performance ◽  
Cobalt Nanoparticles ◽  
Absorbing Materials ◽  
Co Nanoparticles ◽  
Management Functions ◽  
Porous Composites ◽  
Tremendous Challenge ◽  
Widespread Interest

Multifunctional high-performance electromagnetic wave absorbing materials have aroused widespread interest, but they are still a tremendous challenge. Here, we demonstrated multifunctional electromagnetic absorbing characteristics of magnetic cobalt nanoparticles suspended in...

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.

Iron-Oxide Magnetic Materials for Millimeter-Wave Absorption

2021 ◽  
Vol 30 (10) ◽  
pp. 16-21
Author(s):  
Youn-Kyoung BAEK ◽  
Jung-Goo LEE
Keyword(s):  
Electromagnetic Wave ◽  
Iron Oxide ◽  
Magnetic Materials ◽  
Millimeter Wave ◽  
High Performance ◽  
Wave Spectra ◽  
High Frequencies ◽  
Practical Applications ◽  
Absorbing Materials ◽  
Soft Ferrites

High-performance electromagnetic-wave absorbers are required for the control of millimeter-wave spectra, which will play a big role in future 5G and 6G wireless networks. Traditional absorbing materials comprised of metals or soft ferrites have been developed but their lack of ability to absorb at extremely high frequencies continues to hinder their practical applications. Thus, this article briefly introduces several iron-oxide magnetic materials with millimeter-wave absorbing capability.

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 Direct Ink Writing of Highly Conductive MXene Frames for Tunable Electromagnetic Interference Shielding and Electromagnetic Wave-Induced Thermochromism

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Xinyu Wu ◽  
Tingxiang Tu ◽  
Yang Dai ◽  
Pingping Tang ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Electromagnetic Interference ◽  
High Performance ◽  
Normal Operation ◽  
List Type ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Direct Ink Writing ◽  
Aluminum Ions ◽  
Wave Induced

Highlights 3D printing of MXene frames with tunable electromagnetic interference shielding efficiency is demonstrated. Highly conductive MXene frames are reinforced by cross-linking with aluminum ions. Electromagnetic wave is visualized by electromagnetic-thermochromic MXene patterns. Abstract The highly integrated and miniaturized next-generation electronic products call for high-performance electromagnetic interference (EMI) shielding materials to assure the normal operation of their closely assembled components. However, the most current techniques are not adequate for the fabrication of shielding materials with programmable structure and controllable shielding efficiency. Herein, we demonstrate the direct ink writing of robust and highly conductive Ti3C2Tx MXene frames with customizable structures by using MXene/AlOOH inks for tunable EMI shielding and electromagnetic wave-induced thermochromism applications. The as-printed frames are reinforced by immersing in AlCl3/HCl solution to remove the electrically insulating AlOOH nanoparticles, as well as cross-link the MXene sheets and fuse the filament interfaces with aluminum ions. After freeze-drying, the resultant robust and porous MXene frames exhibit tunable EMI shielding efficiencies in the range of 25–80 dB with the highest electrical conductivity of 5323 S m−1. Furthermore, an electromagnetic wave-induced thermochromic MXene pattern is assembled by coating and curing with thermochromic polydimethylsiloxane on a printed MXene pattern, and its color can be changed from blue to red under the high-intensity electromagnetic irradiation. This work demonstrates a direct ink printing of customizable EMI frames and patterns for tuning EMI shielding efficiency and visualizing electromagnetic waves.

scholarly journals Enhanced electromagnetic wave absorption property of binary ZnO/NiCo2O4 composites

2021 ◽  
Author(s):  
Bin Du ◽  
Mei Cai ◽  
Xuan Wang ◽  
Junjie Qian ◽  
Chao He ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Dielectric Properties ◽  
Hydrothermal Reaction ◽  
Absorption Property ◽  
Absorption Properties ◽  
Promising Candidate ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Absorbing Materials ◽  
Minimum Reflection Loss

AbstractNowadays, metal oxide-based electromagnetic wave absorbing materials have aroused widely attentions in the application of telecommunication and electronics due to their selectable mechanical and outstanding dielectric properties. Herein, the binary ZnO/NiCo2O4 nanoparticles were successfully synthesized via hydrothermal reaction and the electromagnetic wave absorption properties of the composites were investigated in detail. As a result, benefiting from the dielectric loss, the as-obtained ZnO/NiCo2O4-7 samples possessed a minimum reflection loss value of −33.49 dB at 18.0 GHz with the thickness of 4.99 mm. This work indicates that ZnO/NiCo2O4 composites have the promising candidate applications in electromagnetic wave absorption materials in the future.

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