Melamine-induced formation of carbon nanotubes assembly on metal–organic framework-derived Co/C composites for lightweight and broadband microwave absorption

Abstract

To extend effective absorption bandwidth at low filling ratio is still a challenge for metal-organic framework-derived microwave absorbing materials. Herein, varied complex structures based on CNTs have been built on...

NiCo@NPC@CF nanocomposites derived from NiCo-MOF/cotton for high-performance electromagnetic wave absorption

“…Fifthly, the magnetic NiCo alloys could achieve magnetic loss by the natural resonance and exchange resonance. 55–57 In short, the superb EM wave absorption performance of the NiCo@NPC@CF composites may be attributed to the synergy of the 3D carbon interconnected network, hierarchical pore structure, the presence of 1D CFs and CNTs, as well as the NiCo alloy, which endows the superb EM wave absorption performance with a super broad EAB of 10.0 GHz ranging from 8.0 to 18.0 GHz at a thickness of 2.3 mm.…”

FeOx Nanoparticle/Coal Gasification Fine Slag Hybrids for Electromagnetic Wave Absorbers

“…Magnetic carbon-based composites that are prepared by combining carbon materials and magnetic NPs are a common type of EMW-absorbing material. − The particle size of the EMW-absorbing materials greatly influences the EMW performance, specifically as the EMW-absorbing material size is decreased from micro- to nanosize. Nanoscale EMW-absorbing materials have numerous atoms on the surface with many dangling bonds, increasing the particle activity and interfacial polarization and resulting in a high EMW performance. − In the field of microwave absorption, carbon materials are known for their strong dielectric loss and low density, − and magnetic NPs are preferred magnetic candidates because of their magnetic loss and high permeability. − Iron and its oxide NPs are potential candidates because of their large magnetic loss and high permeability. The composites obtained by combining iron and/or its oxide NPs with a carbon matrix have excellent EMW absorption performances because of the magnetic and dielectric components and the formation of abundant heterogeneous interfaces between magnetic and carbon matrix components. − For example, Jian and co-workers achieved Fe–Fe 3 O 4 @C hybrids with excellent EMW absorption ability because of abundant heterogeneous interfaces, excellent impedance characteristics, and polarization characteristics.…”

Rational design of two-dimensional flaky Fe/void/C composites for enhanced microwave absorption properties

“…With the rapid development of wireless communications, high-power electrical devices and new-type radars, microwave absorbing materials have attracted widespread and increasing attention in communication security, electromagnetic protection, military stealth, etc. [1][2][3][4][5][6] To satisfy the key characteristics of microwave absorbing materials, such as strong absorption, broadband response, and low thickness, it is imperative to improve and balance the relative complex permittivity and relative complex permeability of the materials. 7,8 Magnetic metal particles are well-known microwave absorption materials owing to their high saturation magnetization and strong magnetic loss.…”