Designed fabrication of reduced graphene oxides/Ni hybrids for effective electromagnetic absorption and shielding

Rational Construction of Hierarchically Porous Fe–Co/N-Doped Carbon/rGO Composites for Broadband Microwave Absorption

“…According to the microwave absorption mechanism, when absorbers have magnetic loss, dielectric loss, and impedance match, more microwaves can enter the interior of the materials and be converted into other forms of energy and dissipated [8,9]. In past decades, many efforts were devoted to researching composites for enhancing microwave absorption, such as (Fe, Ni, Co)/C [10][11][12], (Fe, Ni, Co)/rGO [13][14][15], MFe 2 O 4 /rGO (M = Fe, Ni, Co) [16][17][18][19], MFe 2 O 4 / CNTs [20][21][22], and NiO/SiO 2 /Fe 3 O 4 /rGO [23,24]. However, these materials have the shortcoming of narrow absorption bands, which seriously hinders their practical applications.…”

Reduced graphene oxide decorated with octahedral NiS2/NiS nanocrystals: facile synthesis and tunable high frequency attenuation

“…It is clear that these Raman spectra exhibit two regular peaks, corresponding to the G band ($1573 cm À1 ) and D band ($1347 cm À1 ), respectively. The Gband represents the stretching vibration mode in the sp 2hybridized C-C bonds, while the D band corresponds to the rst-order zone boundary phonon mode associated with defects or lattice distortion 35. Commonly, the ratios of intensity between the D and G bands (I D /I G ) demonstrates the disorder degree of the graphitic layers.…”

Controlling the electric permittivity of honeycomb-like core–shell Ni/CuSiO3 composite nanospheres to enhance microwave absorption properties

“…4,11,12 Various types of core-shell composite microstructures have been reported based on Ni as the core material and different shell materials including polymers, C, SnO 2 , TiO 2 , SiO 2 , ZnO, ZnS, CuO, and graphene composites. 9,[13][14][15][16][17][18][19][20] Zhao et al reported ZnS-wrapped Ni spheres that exhibited a reection loss (RL) of À42.4 dB with high effective bandwidth. 17 Deng et al prepared ZnO nanorod-coated Ni spheres and reported an RL of À30.2 dB.…”