Composition Optimization and Microstructure Design in MOFs-Derived Magnetic Carbon-Based Microwave Absorbers: A Review

Abstract

Magnetic carbon-based composites are the most attractive candidates for electromagnetic (EM) absorption because they can terminate the propagation of surplus EM waves in space by interacting with both electric and magnetic branches. Metal-organic frameworks (MOFs) have demonstrated their great potential as sacrificing precursors of magnetic metals/carbon composites, because they provide a good platform to achieve high dispersion of magnetic nanoparticles in carbon matrix. Nevertheless, the chemical composition and microstructure of these composites are always highly dependent on their precursors and cannot promise an optimal EM state favorable for EM absorption, which more or less discount the superiority of MOFs-derived strategy. It is hence of great importance to develop some accompanied methods that can regulate EM properties of MOFs-derived magnetic carbon-based composites effectively. This review comprehensively introduces recent advancements on EM absorption enhancement in MOFs-derived magnetic carbon-based composites and some available strategies therein. In addition, some challenges and prospects are also proposed to indicate the pending issues on performance breakthrough and mechanism exploration in the related field.

Customizing Heterointerfaces in Multilevel Hollow Architecture Constructed by Magnetic Spindle Arrays Using the Polymerizing‐Etching Strategy for Boosting Microwave Absorption

“…Usually, the magnetic loss is defined as four main mechanisms: magnetic hysteresis, domain‐wall resonance, natural resonance, and eddy current effect. [ 52 , 53 , 54 ] The first two mechanisms can be excluded in the weak electromagnetic field and gigahertz range. For natural resonance, it describes the energy absorption of ferromagnetic materials with large magnetization.…”

Hierarchical Engineering of Double‐Shelled Nanotubes toward Hetero‐Interfaces Induced Polarization and Microscale Magnetic Interaction

“…Recently, hollow engineering for metal-organic-frameworks (MOFs) derivatives is considered as the vital branch of structure design in boosting microwave absorption because of the dualfunctional roles serving as both manipulated metal precursors and sacrificial templates. [13,14] Dielectric-magnetic derivatives with hollow structure is highly desirable to offer overwhelming absorption performance by achieving matched impedance and efficient attenuate capability opposed to solid counterparts. [15] To maximize interfacial merits and magnetic interaction, welldefined hierarchical hetero-interfaces and microscale magneticheteroatomic components within an integral hollow framework are highly desirable.…”

Architecture Design and Interface Engineering of Self-assembly VS4/rGO Heterostructures for Ultrathin Absorbent

“…The ever-increasing demands for the elimination of EM radiation hazards have spurred significant concerns to develop microwave absorption materials [ 3 , 4 ]. Recently, amounts of traditional materials, such as ferrites [ 5 ], metallic magnets [ 6 ], and dielectric ceramics have been widely employed as microwave absorbents [ 7 ]. However, the inherent defects such as larger thickness, high density, and narrow effective absorption bandwidth (EAB) seriously hinder their extensive applications, which is far from fulfilling the ultrathin and enhanced goals of microwave absorbent.…”