Magnetic ferrite/carbonized cotton fiber composites for improving electromagnetic absorption properties at gigahertz frequencies

1CoFe/C Nanosheets on Hollow Carbon Fibers as Composite Fabrics for Electromagnetic Interference Shielding

“…However, carbonized CF cannot meet the impedance matching conditions for EMW attenuation, and most of the incident EMW is reflected from the surface of the EMI material, causing secondary pollution of EMW . Therefore, the introduction of magnetic materials into composite materials is an effective method to prepare absorption-based EMI shielding materials …”

“…16 Therefore, the introduction of magnetic materials into composite materials is an effective method to prepare absorption-based EMI shielding materials. 17 A variety of metal−organic frameworks (MOFs) pyrolysisderived magnetic/carbon hybrid materials have been reported recently. 18 This method can make the magnetic particles uniformly dispersed in the material and not easy to agglomerate, and MOF materials with different morphologies can be obtained by changing the organic ligands and different solvents.…”

Nonwoven carbonized viscose mat for outstanding electromagnetic shielding, fast electrical heating and fire alarm

“…Renewable biomass carbon material has attracted much attention in terms of its rich source, low cost and adjustable structure. Biomass carbon materials such as wood, 19,20 bamboo, 21 cotton, [22][23][24] lotus leaf 25 and water chestnut shell 26 have been reported so far. Viscose fiber is a kind of renewable cellulose fiber, with good moisture absorption, softness and smoothness, is widely used in all kinds of textiles, especially through the non-woven technology made of disposable products such as wet towels, face towels, resulting in inevitable waste.…”

In Situ Reduced Multi-Core Yolk–Shell Co@C Nanospheres for Broadband Microwave Absorption

“…Among these materials, transition magnetic metals (Fe, Co, Ni) with high specific magnetism, outstanding electric conductivity and low cost has attracted a lot of attention as MAM because of its excellent magnetic loss capability endowed by natural resonance and eddy current effects [ 5 , 6 , 7 , 8 ]. However, in order to achieve good impedance matching, so that the electromagnetic wave can incident into the material as much as possible rather than be reflected, it is required that the impedance of the material surface should be as close as possible to the characteristic impedance of free space, that is, the values of relative complex permeability and relative complex dielectric constant should be as close as possible [ 9 , 10 , 11 , 12 ]. Hence, the poor impedance matching which causes an undesirable microwave absorption capacity is still a great challenge to transition metals.…”