Microwave Absorption Research Articles

Activating Basal Plane Inert Sites of Iron Telluride for Motivational Electromagnetic Microwave Absorption

Abstract The basal plane inert sites and inadequate intrinsic dielectric relaxation are the major bottlenecks limiting the electromagnetic microwave (EMW) absorption performance of transition metal tellurides (TMTs). Here, an effective dual defect model based on electron polarization relaxation is established on iron telluride (FeTe) flakes via one‐step O2 plasma treatment. Therefore, the basal plane inert sites of FeTe are activated by Te vacancies and O incorporation, which form abundant polarization centers, resulting in charge redistribution and increased dipole site density, thereby effectively optimizing dielectric relaxation loss. Consequently, the optimal EMW attenuation performance achieves a minimum reflection loss exceeding −69.6 dB at a thickness of 2.2 mm, with an absorption bandwidth of up to 4.9 GHz at a thickness of 1.3 mm. Besides, FeTe with dual defect exhibits a prominent radar cross‐section reduction of 42 dBsm, indicating excellent radar wave attenuation capability. This study illustrates an innovative model system for elucidating dielectric relaxation loss mechanisms and provides a feasible approach to developing high‐loss TMTs‐based absorbers.

Ultralight multifunctional aerogels with in situ enhanced chitosan networks at micro-/macroscale for super-efficiency electromagnetic metastructure absorbers.

Ultralight multifunctional aerogels with in situ enhanced chitosan networks at micro-/macroscale for super-efficiency electromagnetic metastructure absorbers.

Controlled assembly engineering of Co@Co9S8-Glass micro-nano composite hollow microspheres towards microwave absorption improvement

Controlled assembly engineering of Co@Co9S8-Glass micro-nano composite hollow microspheres towards microwave absorption improvement

The microwave absorption and anti-corrosion multiple performance of nickel foam loaded with NiCo2O4 materials

The microwave absorption and anti-corrosion multiple performance of nickel foam loaded with NiCo2O4 materials

Machine Learning‐Based Design and Fabrication of Multilayered Microwave Absorber

ABSTRACTMicrowave absorbers are useful to develop sensors, absorb unwanted radiation, modify antenna patterns, electromagnetic interference shielding, reduce radar cross section, and so forth. With the conventional absorbers being bulk with dimensions more than the operating wavelength, continuous efforts are being made to develop thin absorbers, with thicknesses at least of the order of the wavelength. Homogeneous materials do not provide efficient absorption because of the difficulty in matching the impedance at the interfaces with a good absorption in the bulk. Multilayered structures offer a graded‐index nature, providing both impedance matching and good volumetric absorption. Designing the multilayered structure requires the manipulation of five variables per layer and deciding on a large number of possibilities in arranging the sequence of the layers. In this regard, this paper uses the machine learning‐based random forest regressor (RFR) and genetic algorithm (GA) to use the trained data to pick up the solution that gives us a wide band, nearly perfect absorption. In this work, five different polymer nanocomposites with various fillers are prepared, and their individual properties, namely, complex dielectric permittivity and complex magnetic permeability, are evaluated experimentally. These data are fed into the machine learning algorithms to predict multilayered structures with four and six layers, with suitable stacking of the composites along with specific thicknesses to prepare multilayer composites to achieve > 98% absorption over the X‐band frequency (8–12 GHz) region. The use of RFR/GA algorithms helps the researchers to save considerable time preparing the multilayers with desired electromagnetic properties.

Synthesis of high-performance boron carbon nitride nanotube/Ni microwave absorber featuring in-situ formed heterostructure

Synthesis of high-performance boron carbon nitride nanotube/Ni microwave absorber featuring in-situ formed heterostructure

Efficient Microwave Absorber for Phase-Engineered Modulation of MoS2 Induced by Trace Atom Doping

Efficient Microwave Absorber for Phase-Engineered Modulation of MoS2 Induced by Trace Atom Doping

The synergistic enhancement of microwave absorption performance and corrosion resistance of FeCo by polypyrrole-M16 and TiO2.

The synergistic enhancement of microwave absorption performance and corrosion resistance of FeCo by polypyrrole-M16 and TiO2.

Intrinsic magnetic and microwave absorbing properties of 3:29-type Nd2.7Zr0.3(Fe, Ti)29 compounds with planar anisotropy

Intrinsic magnetic and microwave absorbing properties of 3:29-type Nd2.7Zr0.3(Fe, Ti)29 compounds with planar anisotropy

Preparation of FexSiy/SiC/C composite microwave absorbents by fly ash and coal gasification residue

Preparation of FexSiy/SiC/C composite microwave absorbents by fly ash and coal gasification residue

Tunable microwave absorption performances of N, S co-doped carbon nanofibers embedded with Ni/NiS/NiS2 nanohybrids

Tunable microwave absorption performances of N, S co-doped carbon nanofibers embedded with Ni/NiS/NiS2 nanohybrids

Lightweight and efficient reduced graphene oxide modified by alumina composites for microwave absorption

Lightweight and efficient reduced graphene oxide modified by alumina composites for microwave absorption

Dual-resonant cavities-induced hierarchical heterogeneous enhancement effect of multi-interfacial microspheres for broadband microwave absorption

Dual-resonant cavities-induced hierarchical heterogeneous enhancement effect of multi-interfacial microspheres for broadband microwave absorption

Progress of MOFs composites in the field of microwave absorption

Progress of MOFs composites in the field of microwave absorption

Recent advances in Bioinspired cellulose-derived nanomaterials for microwave absorption

Recent advances in Bioinspired cellulose-derived nanomaterials for microwave absorption

Tailored hard/soft magnetic heterostructure anchored on 2D carbon nanosheet for efficient microwave absorption and anti-corrosion property

Tailored hard/soft magnetic heterostructure anchored on 2D carbon nanosheet for efficient microwave absorption and anti-corrosion property

Low-frequency microwave absorption and favorable thermal conductivity in epoxy-based composite endowed by boron nitride@cobalt ferrite heterostructure fillers

Low-frequency microwave absorption and favorable thermal conductivity in epoxy-based composite endowed by boron nitride@cobalt ferrite heterostructure fillers

Preparation and tunable microwave absorption capacities of tubular NiFe@CN nanocomposites via a self-sacrificed template of NiFe Prussian blue analogs

Preparation and tunable microwave absorption capacities of tubular NiFe@CN nanocomposites via a self-sacrificed template of NiFe Prussian blue analogs

In-situ formed SiC onto coal gasification residue (semi coke) to fabricate oxidation process-tolerable SiC/Ni2Si/SC composite for efficient microwave absorption in hot-air environment

In-situ formed SiC onto coal gasification residue (semi coke) to fabricate oxidation process-tolerable SiC/Ni2Si/SC composite for efficient microwave absorption in hot-air environment

Composition and structure evolution of flexible SiCN fibers for high-performance microwave absorption throughout the carbothermal reduction process

Composition and structure evolution of flexible SiCN fibers for high-performance microwave absorption throughout the carbothermal reduction process