Facile synthesis of rGO/SmFe5O12/CoFe2O4 ternary nanocomposites: Composition control for superior broadband microwave absorption performance

Preparation and electromagnetic properties characterization of reduced graphene oxide/strontium hexaferrite nanocomposites

“…Figure 5c shows the C 0 curves of RGO/SrFe 12 O 19 nanocomposites. while the C 0 is basically unchanged above 9 GHz, while above 9 GHz the C 0 is basically unchanged [34,35]. This implies that the main reasons for the magnetic loss are natural resonance, hysteresis effect and exchange resonance in the range of 2-9 GHz, but eddy current loss accounts for the magnetic loss in the range of 9-18 GHz.…”

“…The ε ′ and ε ′′ are two important physical quantities used to describe the relaxation process. Based on Equation 2, it can be seen that the relationship between ε ′ and ε ′′ is a semicircle with ε ′ as the abscissa and ε ′′ as the ordinate, which is called Debye semicircle, and each Debye semicircle represents a a Debye relaxation process [34]. The ε ′′ −ε ′ curves of RGO/SrFe 12 O 19 nanocomposites are shown in Figure 5d.…”

Modeling dielectric permittivity of polymer composites filled with transition metal dichalcogenide nanoparticles

“…To extend it to arbitrary values of , we apply the integration embedding method. We start with a pure matrix with dielectric permittivity m , replace a small volume of its material Áv 1 (per unit volume of the composite) with filler, and calculate the dielectric permittivity of the composite c, 1 from equation (17). Afterwards, a new matrix is considered with dielectric permittivity c,1 , in which another infinitesimal volume Áv 2 is replaced with filler, and its dielectric permittivity c, 2 is calculated by using the same approach.…”

“…), 9 transition metal mono and dichalcogenides, 10,11 transition metal carbides (MXenes), 12 layered metal oxides and hydroxides, 13 and their hierarchical structures. 14 In particular, the Wang group has recently demonstrated exceptionally high EM absorption of polymers reinforced with (i) superparamagnetic cobalt ferrite nanospheres decorated with reduced graphene oxide (rGO), 15 (ii) capsule-like structures of CoFe 2 O 4 nanoparticles enriched with rGO and covered with poly(vinylpyrrolidone), 16 (iii) binary composites of termochromic samarium-iron garnet Sm 3 Fe 5 O 12 with cobalt ferrite furnished with rGO, 17 (iv) CoFe 2 O 4 nanospheres embedded into MoS 2 nest-like nanostructures, 18 and (v) graphene oxide aerogels loaded with cobalt ferrite nanoparticles. 19 This study deals with dielectric properties and EMI shielding effectiveness of polymer composites filled with semiconductor transition metal dichalcogenide (TMDC) nanoparticles and their hybrid nanostructures.…”

Three-Dimensional Bi2Fe4O9 Nanocubes Loaded on Reduced Graphene Oxide for Enhanced Electromagnetic Absorbing Properties

“…Inspired by of the vast amount of research on two dimensional (2D) materials, rGO represents the unique characteristics needed to acquire unparalleled chemical, physical, and electronic properties because of the electron confinement in dimensions (Zhu et al, 2010 ; Wang et al, 2011 ; Guo H. et al, 2013 ). Furthermore, the fantastically great specific surface area and positive electrical conductivity makes rGO an extremely ideal material to incorporate with magnetic loss materials to acquire effective regulation of EM parameters (Hummers and Offeman, 1958 ; Guo H. B. L. et al, 2013 ; Zhang et al, 2013 , 2014 ; Shen et al, 2018 ; Prasad et al, 2019 ). Han et al created a two-step process which involves a hydrothermal reaction and surface modification to obtain the graphene-wrapped ZnO hollow spheres that exhibit an maximum reflection loss of −45.1 dB (Han et al, 2014 ).…”