High densities of magnetic nanoparticles supported on graphene fabricated by atomic layer deposition and their use as efficient synergistic microwave absorbers

Interfacially Engineered Sandwich‐Like rGO/Carbon Microspheres/rGO Composite as an Efficient and Durable Microwave Absorber

“…Although the minimum value of rGO/ACMs/rGO is not outstanding compared to the published works, its broad bandwidth for effective absorption is absolutely comparable to many graphene-based microwave absorbers. [20][21][22][23][24][25][26][27][28][29][53][54][55][56][57][58] More importantly, the absence of various magnetic particles enables a lightweight label for rGO/ACMs/rGO, which may promise it a bright prospect as novel microwave absorbing materials. As aforementioned, rGO, ACMs, and rGO/ACMs/rGO have negligible magnetic loss mechanism, and therefore they attenuate the incident EM wave with single dielectric loss mechanism.…”

“…[17][18][19] Incorporation of other lossy materials, especially magnetic metal and metal oxides, has been widely studied as the imperative solution to improve the matching of characteristic impedance and enhance the microwave absorption performance. [20][21][22][23][24][25][26][27][28][29] For example, graphene-coated Fe nanocomposites and Ni/graphene composites showed enhanced microwave absorption due to the charge transfer at metal/graphene interface and the polarization of free carriers; [ 20,21 ] Fe 3 O 4 /graphene, rGO-Fe 2 O 3 , and rGO/CNT-Fe 3 O 4 materials demonstrated optimum characteristic impedance and compatible dielectric and magnetic loss, which resulted in their strong refl ection loss in the frequency range of 12.0-16.0 GHz; [21][22][23] Graphene decorated with coreshell Fe@Fe 3 O 4 @ZnO nanoparticles was also fabricated, and Graphene-based composites offer immense potential for overcoming the challenges related to the performance, functionality, and durability in microwave absorption. In this study, a sandwich-like graphene-based composite is successfully fabricated by an interfacial engineering of amorphous carbon microspheres (ACMs) and reduced graphene oxide (rGO), with a structure of rGO/ACMs/rGO.…”

Lightweight conductive graphene/thermoplastic polyurethane foams with ultrahigh compressibility for piezoresistive sensing

“…The D band at 1360 cm À1 is attributed to the presence of sp 3 defects within the graphene sheets, and the G band is ascribed to the E 2g phonon mode of in-plane sp 2 carbon atoms. 53,54 Their intensity increases with increasing graphene loading. All these provide additional information about the existence of the interaction between graphene and the TPU matrix.…”

Graphene/Polymer Nanocomposites as Microwave Absorbers

“…However, it is very sensitive to temperature and mechanically not flexible when compared to other polymers and therefore may not be viable as a matrix material for preparing graphene-based composites for real applications. Hexgonal Ni nanocrystals decorated monolayer graphene [47], polycrystalline Fe 3 O 4 nanoparticles decked r-GO/FLG [48][49][50], and submicron sized CoFe 2 O 4 hollow spheres decorated on single sheet r-GO [51] filled wax composites showed an excellent MA capacity (RL less than −10 dB corresponding to 90 % MA for different thicknesses of the wax composite samples). These composites have shown far superior microwave absorption capacity than the typical nonmagnetic r-GO/FLG particles filled wax composites [52,53].…”