A Novel Strategy in Electromagnetic Wave Absorbing and Shielding Materials Design: Multi‐Responsive Field Effect

Abstract

With the rapid development of 5th Generation Mobile Communication Technology (5G), late-model electromagnetic wave absorbing and shielding (EMAS) materials have proven to be the research emphasis of electromagnetic (EM) wave shelter. Great efforts have been made to optimize EMAS functional materials for diverse EM wavebands. [1] Each range of EM wave bands has a specific application in communication, electrical engineering, or information transmission. [2] For instance, ultrahigh frequency (UHF) EM wave of 0.3 < f < 3 GHz, also known as P/L/S or B/C/D/E band, is applied to television radar air navigation and mobile communication as well as microwave relay systems; the superhigh frequency (SHF) EM wave of 3 < f < 30 GHz, including S/C/X/Ku/K/ Ka-band or F/G/H/I/J/K band, is customarily adopted in digital telecommunication and satellite communication as well as waveguide communication. Moreover, EM waves in other frequency ranges, like terahertz wave and gamma ray, have been widely used in label-free DNA detection, high-temperature superconducting material research, radiographic testing, and even oncotherapy. In these cases, each specific application scenario requires specific EM waves in a specific frequency range, illustrating that EM wave clutters should be absorbed or otherwise shielded. Under these circumstances, developing novel and practical EMAS materials may meet the demands of EM wave science, especially in multifunctional fields.Traditional EMAS materials consist of resistance absorber, [3] dielectric absorber, [4] magnetic medium absorber, [5] and composites based on monomaterials as mentioned earlier, [6] including CuS, [7] MoSe 2 , [8] ferrites and alloys (Co x Fe 3Àx O 4 @C), [9] modified carbons (hollow carbon spheres), [10] etc. In the past decade, 2D transition metal carbides or nitrides, or MXenes, have been prefabricated and naturally applied to EMAS materials synthesis due to their outstanding EM wave loss capacity. [11] Many scholars have devoted themselves to MXene materials and structure design. The electrical conductivity of MXenes can reach 10 3 S cm À1 , leading to extraordinary EM wave shielding property. [12] Many reported MXene absorbers are monolayers, [13] whereas macrostructure design is introduced. Thus, macrodevices, like hollow MXene sphere foam, [14] are synthesized. It is

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

“…4 , the curve of ε′ versus ε″ exhibits a single semicircle denoted as Cole–Cole semicircle, which illustrates the process of Debye dipolar relaxation. Generally, the dielectric loss also can be obviously represented by Debye dipolar relaxation [ 39 ]. The curves of ε′ versus ε″ for VS 4 /rGO heterostructures are shown in Fig.…”

“…The defects of VS 4 nanorods and residual oxygen-containing functional groups of rGO break the balance of charge distributions in nanorods and interface [ 11 , 26 ]. Eventually, the induced multitudinous dipoles and interfacial polarization centers significantly facilitate polarization relaxations [ 39 , 48 ]. Secondly, the constructed 2D VS 4 /rGO heterointerfaces are joined together firmly.…”

Multifunctional Integrated Transparent Film for Efficient Electromagnetic Protection

“…However, the accompanying electromagnetic radiation becomes a "health killer" to human [1][2][3][4]. Exploring materials with high-efficient and stable electromagnetic wave attenuation capability is a feasible strategy to reduce electromagnetic pollution [5,6]. Recently, transparent EMI shielding films have sparked huge interest of researchers because these films can meet the requirements of optical observation and electromagnetic protection at the same time [7,8].…”

Macroscopic Electromagnetic Cooperative Network-Enhanced MXene/Ni Chains Aerogel-Based Microwave Absorber with Ultra-Low Matching Thickness

“…In the last few years, emerging strategies have been widely used to optimize the matching thickness of absorber, especially the idea of electromagnetic cooperation [ 8 , 9 ]. EMW absorbers, coexisting dielectric loss and magnetic loss media, generate an electromagnetic cooperative loss network in the process of responding with EMW spontaneously [ 10 ]. This network not only induces magnetic loss for enriching attenuation mechanism but also produces interfacial effects due to the existence of heterogeneous interface nearby, which will affect the crystal and electronic structure [ 11 ].…”