Synthesis and high-performance electromagnetic wave absorption of SiC@C composites

Fiber, monolithic fiber and twisted fiber structures: efficient microwave absorption via surface-modified carbon nanotube buckypaper/silicon carbide-based self-sealing layered composites

“…[1][2][3][4][5] Silicon carbide (SiC) is a dielectric loss-absorbing material that absorbs microwaves mainly through the polarization-relaxation loss of the dielectric material, which has been demonstrated in many studies. [6][7][8][9][10][11][12] Carbon nanotubes (CNTs) have a high electric loss tangent and exhibit microwave absorption properties. 13 However, due to the high electrical conductivity of CNTs, most CNT composites exhibit shielding properties, 14 preventing the potential absorptive properties of CNTs from being fully utilized.…”

Compositional and Hollow Engineering of Silicon Carbide/Carbon Microspheres as High-Performance Microwave Absorbing Materials with Good Environmental Tolerance

“…In the past few years, hollow microsphere is always a popular and advanced structure for MAMs due to its superiorities in low density, strong attenuation ability, and good dispersion [ 23 ]. Several groups therein show keen interests in the fabrication of hollow SiC/C microspheres to further strengthen their microwave absorption characteristics [ 7 , 20 , 24 ]. A universal preparative strategy for such composites is to employ SiO 2 microspheres as both Si source and hard template, and then remove excessive SiO 2 cores with hydrofluoric acid after solid reaction with carbon shells at extremely high temperature (about 1400 °C).…”

“…A universal preparative strategy for such composites is to employ SiO 2 microspheres as both Si source and hard template, and then remove excessive SiO 2 cores with hydrofluoric acid after solid reaction with carbon shells at extremely high temperature (about 1400 °C). Although current successful examples all validate the contribution from hollow structure, it has to be pointed that this strategy usually requires strict reaction conditions, because the hollow structure easily suffers from fragmentation and collapse due to the susceptible to high-temperature solid reaction [ 24 ]. As a result, it is still seldom explored to simultaneously implement compositional and structural engineering for the construction of hollow SiC/C microspheres.…”

Optimization of electromagnetic absorption properties based on graphene, carbon nanotubes, and Fe3O4 multidimensional composites

“…Incorporating magnetic ferrite into carbon materials can advance the attenuation property of the material and facilitate the creation of multiple interfaces, thereby increasing the material's attenuation mode and enhancing the composites' property to absorb waves 20,21 . Hou et al 22 prepared Co/C composites with diverse Co contents in Figure 2A. The overall dielectric loss was shown to be influenced by the interfacial polarization, dipole polarization, and dielectric relaxation in the carbon matrix.…”