Fabrication and microwave absorption of multiwalled carbon nanotubes anchored with CoS nanoplates

S‐parameters, electrical permittivity, and absorbing energy measurements of carbon nanotubes‐based composites in X‐band

“…In a similar way the comparison of tan δμ did not show significant differences among the samples prepared, due to the dielectric characteristic of CNT. In view of the low magnetic losses of CNT, some authors study the combined use of metallic particles and rare earth oxides with CNT, in order to provide an increase in the permeability 8,10,22 . These authors look for not only to increase the magnetic losses, but also to extend the attenuation frequency range, obtaining broadband absorbers.…”

“…Micheli et al, 2014, 9 studied nanostructured composites based on CNT and nanocarbon fibers and the results of electromagnetic characterization showed greater absorption efficiency and increased electrical permittivity, when compared to neat CNT. Huang and cols, 2017, 10 showed that absorbers based on CNT anchored in CoS nanoplates presented a better impedance matching allowing the transmission of wave in the material, with a maximum attenuation of −56.1 dB. Another interesting study was presented by Savi and cols, 2019, 3 which showed that the surface area and the purity of CNT influenced the absorption properties of the electromagnetic wave.…”

“…Carbon materials, more specifically carbon nanotubes (CNT), are promising candidates for RAM processing, due to their excellent electrical and thermal characteristics, reduced density, high surface area, and reduced weight percentages in RAM processing 3,8,9 . However, CNT present low magnetic losses, since they are typically dielectric materials 1,10 . Taking into account the promising characteristics of CNT and seeking to improve their use in RAM processing, several studies have been carried out involving their use 3,8–10 .…”

“…However, CNT present low magnetic losses, since they are typically dielectric materials 1,10 . Taking into account the promising characteristics of CNT and seeking to improve their use in RAM processing, several studies have been carried out involving their use 3,8–10 . Lu et al, 2015, 8 prepared thin membranes of CNT (0.1 mm), named as Buckypapers (BP), incorporated with a magnetic material (Fe3O4), which showed broadband behavior and electromagnetic wave attenuation of −15.3 dB at 15.7 GHz.…”

Heterostructure Composites of CoS Nanoparticles Decorated on Ti3C2Tx Nanosheets and Their Enhanced Electromagnetic Wave Absorption Performance

“…In recent years, CoS hybrid absorption composites have attracted much attention. Huang et al prepared a heterostructure MWCNTs/CoS material, which consisted of numerous CoS nanoplates anchored with MWCNTs, and obtained good EM wave absorption performance [ 30 ]. Our groups fabricated cole-shell structure CoS@ppy composites, which showed an optimal RL of –41.8 dB at 6.96 GHz with a filler loading of 20 wt % [ 31 ].…”