Fabrication of carbon encapsulated Co 3 O 4 nanoparticles embedded in porous graphitic carbon nanosheets for microwave absorber

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.…”

In-situ synthesis of carbon nanotubes decorated by magnetite nanoclusters and their applications as highly efficient and enhanced microwave absorber

“…Currently, with the rapid development of communications equipments and electronics, the consequent electromagnetic interference pollution is becoming ever-increasing serious [1][2][3][4][5][6][7]. To address these issues, multifarious microwave absorbing materials, which can attenuate microwave by converting them into heat or dissipating them via interference, have been extensively investigated, including ferrites [8,9], magnetic metals [10,11], carbon fibers [12,13] and conductive macromolecules [14,15].…”

Enhanced Microwave Absorption Properties of FeNi Nanocrystals Decorating Reduced Graphene Oxide

“…Aiming at these problems, microwave absorbing materials have been comprehensively and deeply studied . Carbon‐based materials as microwave absorbers have excellent high frequency electromagnetic wave reflection loss performance, such as carbon nanotubes (CNTs), carbon spheres, porous carbon, carbon nanocoil, graphene, and reduced graphene oxides (rGo) . Among these carbon materials, rGO has a great potential as microwave absorbing material due to excellent dielectric loss …”