Carbon nanotubes decorated FeNi/nitrogen-doped carbon composites for lightweight and broadband electromagnetic wave absorption

MoS2-Based Nanocomposites for Microwave Absorption: A Review

“…106,109 In general, the change of the value of C o with frequency could estimate whether the magnetic loss of the material is caused by eddy loss or natural resonance loss. 110,111 If the curve of the value of C o fluctuates greatly with frequency, it indicates that the magnetic loss of the material is mainly caused by natural resonance loss. On the contrary, if the value of C o is almost a constant, the magnetic loss of the material is mainly caused by the eddy current loss.…”

“…In order to study the eddy loss mechanism, the following formula is used to calculate the eddy current loss coefficient C o : C normalo = 2 π μ normalo d 2 σ = μ ″ false( μ ′ false) 2 f where μ o is the vacuum permeability, d is the thickness of the absorber, σ is the conductivity, μ′ is the real part of the permeability, μ″ is the imaginary part of the permeability, and f is the frequency . The value of C o could be calculated by taking the real and imaginary values of the permeability obtained from the test into the above eq . , In general, the change of the value of C o with frequency could estimate whether the magnetic loss of the material is caused by eddy loss or natural resonance loss. , If the curve of the value of C o fluctuates greatly with frequency, it indicates that the magnetic loss of the material is mainly caused by natural resonance loss. On the contrary, if the value of C o is almost a constant, the magnetic loss of the material is mainly caused by the eddy current loss. , Shown in Figure are the C o values of the C3N1, C1N3, and C1N1 Co-2DSi (400 °C), Co-2DSiO 2 (850 °C), and Co-2DSiO 2 (950 °C) samples.…”

Hierarchical porous carbon frameworks derived from Juncus effusus biomass with robust electromagnetic wave absorption properties

“…1,2 Microwave absorption (MA) materials could absorb the incident waves and subsequently dissipate them, avoiding surface reflection-induced secondary pollution, thus they have generated intensive interest in addressing the EMW pollution. 3,4 Recently, carbon-based porous materials, such as covalent organic frameworks (COFs), 5 metal–organic frameworks (MOFs), 6 carbon nanotubes (CNTs), 7 etc. , have emerged as promising electromagnetic absorbers (EMAs) due to their lower mass density, stronger corrosion resistance, and better design flexibility advantages over the traditional metal-based EMAs.…”

Carbon Nanotube/FeNi3 Nanoparticle Composites for Electromagnetic Wave Absorption

“…30 FeNi permalloy exhibits excellent performance in targeted drugs, 31 data storage, 32 and battery energy conversion; 33 however, there is relatively little research on the combination of CNT in the field of electromagnetic wave absorption. 23 Typically, FeNi 3 permalloy showed great prospects in electromagnetic wave absorption when incorporated with carbon materials. 34−36 Various methods have been employed to synthesize FeNi 3 particles, including mechanical alloying, 37 electrodeposition, 38 hydrothermal method 39 and chemical reduction process, 40 and so on.…”