Microwave absorption properties of MWCNT-SiC composites synthesized via a low temperature induced reaction

Abstract

The composites containing SiC and multiwalled carbon nanotubes (MWCNTs) were synthesized via the reaction of Si powders and MWCNTs induced by that of Na and sulfur. The MWCNT-SiC composites prepared at 600 °C exhibit excellent microwave absorbing properties, which reach a minimum reflection loss of -38.7 dB at a frequency around 12.9 GHz. The absorbing properties are bound up with the high yield of porous SiC spheres comprised of nanocrystals. The porous structure, high density of stacking faults in SiC crystallites, interfaces between MWCNTs and SiC spheres, grain boundaries between SiC nanocrystals, as well as the interfacial polarizations aroused therefrom, are responsible for the excellent microwave absorbing properties

Microwave Radar Absorbing Properties of Multiwalled Carbon Nanotubes Polymer Composites: A Review

“…Literature reports show the enhancement of EM absorbing properties of MWCNTs when metals , ferrites , and nonmagnetic structures [91][92][93][94][95][96][97][98][99][100][101][102][103] have been attached. Carbon nanostructures such as graphenes and short carbon fibers have been attached with MWCNTs [104][105][106][107][108][109] to get improved EM absorption properties.…”

Characterization of magnetic and microwave absorption properties of multi-walled carbon nanotubes/Mn-Cu-Zr substituted strontium hexaferrite nanocomposites

“…The wide bandwidths in the reflection loss diagrams of the nanocomposite are also related to the presence of the MWCNTs that leads to more additional interfaces that cause multiple scattering of the electromagnetic waves [28,29]. Besides, when the electromagnetic wave enters into the MWCNTs, multiple scattering and reflection from different walls of MWCNTs leads to the gradual waste of electromagnetic energy [30,31]. All of these reasons lead to the excellent absorption properties in the nanocomposites.…”

“…Hence, it could be expected that ferrite/MWCNTs nanocomposite exhibits dielectric and magnetic loss simultaneously. It is also worth mentioning that the increasing electric loss tangent factor could not be the one and the only reason for excellent microwave absorption performance, because the concept of matched impedance is another important parameter relating to reflection loss [30]. Actually, high reflection loss for the nanocomposites is resulted from simultaneous electronic and magnetic losses and impedance matching.…”

Microwave‐absorbing performance and mechanical properties of poly(vinyl chloride)/acrylonitrile–butadiene rubber thermoplastic elastomers filled with multiwalled carbon nanotubes and silicon carbide

“…8 The microwave-absorbing performance of the MWCNT/SiC composites were closely related to the SiC spheres, which were composed of nanocrystals; the interfaces between the MWCNTs and SiC spheres; and the grain boundaries between the SiC nanocrystals. 9,10 The MWCNT/SiC composites reached a RL min values of À38.7 dB around 12.9 GHz. 10 The addition of a certain mass of SiC reduced the percolation threshold and improved the microwave absorption of the carbon black/epoxy resin composites.…”

“…9,10 The MWCNT/SiC composites reached a RL min values of À38.7 dB around 12.9 GHz. 10 The addition of a certain mass of SiC reduced the percolation threshold and improved the microwave absorption of the carbon black/epoxy resin composites. 8 The microwave-absorbing performance of polymer composites also depends on the dispersion of fillers in the matrix.…”