Carbon‐Based Radar Absorbing Materials toward Stealth Technologies

Advanced Science, Journal Year: 2023, Volume and Issue: 10(32)

Published: Sept. 21, 2023

Abstract Stealth technology is used to enhance the survival of military equipment in field surveillance, as it utilizes a combination techniques render itself undetectable by enemy radar systems. Radar absorbing materials (RAMs) are specialized reduce reflection (or absorption) signals provide stealth capability, which core component passive countermeasures applications. The properties RAMs can be optimized adjusting their composition, microstructure, and surface geometry. Carbon‐based present promising approach for fabrication ultrathin, versatile, high‐performance due large specific area, lightweight, excellent dielectric properties, high electrical conductivity, stability under harsh conditions. This review begins with brief history an introduction electromagnetic waves, systems, materials. followed discussion recent research progress carbon‐based RAMs, including carbon blacks, fibers, nanotubes, graphite, graphene, MXene, along in‐depth examination principles strategies on attenuation characteristics. Hope this will offer fresh perspectives design thereby fostering deeper fundamental understanding promoting practical

Language: Английский

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From VIB- to VB-Group Transition Metal Disulfides: Structure Engineering Modulation for Superior Electromagnetic Wave Absorption

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 16(1)

Published: Nov. 23, 2023

The laminated transition metal disulfides (TMDs), which are well known as typical two-dimensional (2D) semiconductive materials, possess a unique layered structure, leading to their wide-spread applications in various fields, such catalysis, energy storage, sensing, etc. In recent years, lot of research work on TMDs based functional materials the fields electromagnetic wave absorption (EMA) has been carried out. Therefore, it is great significance elaborate influence EMA time speed up application. this review, advances development (EMW) absorbers TMDs, ranging from VIB group VB summarized. Their compositions, microstructures, electronic properties, and synthesis methods presented detail. Particularly, modulation structure engineering aspects heterostructures, defects, morphologies phases systematically summarized, focusing optimizing impedance matching increasing dielectric magnetic losses with tunable EMW performance. Milestones challenges also identified guide design new high

Language: Английский

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Thermally Derived Hierarchical Nanoplates for Electromagnetic Protection and Waste Energy Recovery Device

Small, Journal Year: 2023, Volume and Issue: 19(43)

Published: June 27, 2023

With the advent of intelligent society and popularity electronic equipment, protection treatment electromagnetic (EM) radiation have become hot research topics all over world. Herein, novel 2D carbon-based nanoplates with uniformly embedded Co nanoparticles are prepared, unique hierarchical structure integrated magnetic-dielectric components. The obtained exhibit a wide range tunable EM properties (ε' for 3.38 to 34.67 ε″ 0.13 31.45) by manipulating dispersed states inside wax system, which can achieve an effective switch from microwave absorption interference shielding performance. optimal reflection loss reaches -55.6 dB, efficiency is 93.5%. Meanwhile, also impressive capacitive performance, specific capacitance 1654 F g-1 at 1 A . Based on this, creative device constructed nanoplates, convert harmful useful electric energy recycling. This work offers new idea development materials functional devices, powerfully promoting advance environmental fields.

Language: Английский

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Metal–Organic Framework‐Manipulated Dielectric Genes Inside Silicon Carbonitride toward Tunable Electromagnetic Wave Absorption

Small, Journal Year: 2023, Volume and Issue: 19(46)

Published: July 16, 2023

Abstract Heterointerface engineering for different identifiable length scales has emerged as a key research area obtaining materials capable of high‐performance electromagnetic wave absorption; however, achieving controllable architectural and compositional complexity in nanomaterials with environmental thermal stabilities remains challenging. Herein, metal‐containing silicon carbonitride (SiCN/M) nanocomposite ceramics multiphase heterointerfaces were situ synthesized via coordination crosslinking, catalytic graphitization, phase separation processes using trace amounts metal–organic frameworks (MOFs). The results reveal that the regulation dielectric genes by MOFs can yield considerable lattice strain abundant defects, contributing to strong interfacial dipole polarizations. as‐prepared SiCN/M demonstrate excellent microwave absorption performance: minimum reflection loss (RL min ) is −72.6 dB at thickness only 1.5 mm −54.1 an ultralow frequency 3.56 GHz SiCN/Fe RL −55.1 broad bandwidth 3.4 1.2 SiCN/CoFe ceramic. are expected provide guidance design future based on heterointerface while offering paradigm developing MOF‐modified SiCN desirable properties.

Language: Английский

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Phase Engineering on Amorphous/Crystalline γ‐Fe₂O₃ Nanosheets for Boosting Dielectric Loss and High‐Performance Microwave Absorption

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(10)

Published: Nov. 22, 2023

Abstract To design and develop efficient microwave absorbents via phase engineering is still less studied. The unique properties caused by constructing heterophase structure hold the potential to strengthen absorbing capability toward radiation. Herein, amorphous/crystalline γ‐Fe 2 O 3 nanosheets (Fe‐H) are carefully fabricated through a controlled annealing process. matched Fermi levels formed on both sides of interface not only provides interfacial polarizations but also facilitates transport electrons with scattering over whole Fe‐H nanosheets. Thereby, conduction loss dielectric polarization relaxation promoted, leading strengthened attenuation electromagnetic wave as‐synthesized sample exhibited minimum reflection ‐89.5 dB centered at thickness 2.00 mm, associated an effective absorption bandwidth (reflection ≤ ‐10 dB) reaching 6.45 GHz. All these behaviors superior its pure amorphous absorbent bare crystalline counterpart. Furthermore, this strategy valid when extended Co Ni based oxides, suggesting universality generality for promoting absorption. Henceforth, study indicates favorable synthesis application materials as absorbents.

Language: Английский

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A Perspective of Tailoring Dielectric Genes for 2D Materials Toward Advanced Electromagnetic Functions

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(52)

Published: Aug. 27, 2024

Abstract 2D materials and their composites with electromagnetic properties are becoming increasingly popular. Obtaining insight into the nature of (EM) response manipulation is imperative to guide scientific research technological exploitation at such a critical time. From this perspective, dielectric genes material hybrids have been highlighted based on recent literature. This endows an unlimited possibility manipulating EM response, even elevated temperatures. The definitions criteria toward systematically clarified summarized. gene categories successfully discriminated, including conduction networks, intrinsic defects, impurity interfaces in composite, temperature evolution revealed detail. More importantly, tuning strategies for microwave absorption, shielding effectiveness, expanded functions thoroughly discussed. Finally, significant predictions provided multispectral functions, future applications multifunctional exploration anticipated. Dielectric will open unexpected horizon advanced functional coming 5G/6G age, providing boost promoting environmental protection, devices, next‐generation smart devices.

Language: Английский

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Hollow tubular MnO2/MXene (Ti3C2, Nb2C, and V2C) composites as high-efficiency absorbers with synergistic anticorrosion performance

Carbon, Journal Year: 2023, Volume and Issue: 218, P. 118698 - 118698

Published: Nov. 29, 2023

Language: Английский

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Structural Engineering of Hierarchical Magnetic/Carbon Nanocomposites via In Situ Growth for High-Efficient Electromagnetic Wave Absorption

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: April 15, 2024

Materials exhibiting high-performance electromagnetic wave absorption have garnered considerable scientific and technological attention, yet encounter significant challenges. Developing new materials innovative structural design concepts is crucial for expanding the application field of absorption. Particularly, hierarchical structure engineering has emerged as a promising approach to enhance physical chemical properties materials, providing immense potential creating versatile materials. Herein, an exceptional multi-dimensional was meticulously devised, unleashing full microwave attenuation capabilities through in situ growth, self-reduction, multi-heterogeneous interface integration. The features three-dimensional carbon framework, where magnetic nanoparticles grow on skeleton, necklace-like structure. Furthermore, nanosheets assemble within this framework. Enhanced impedance matching achieved by precisely adjusting component proportions, intelligent integration diverse interfaces bolstered dielectric polarization. obtain Fe

Language: Английский

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Dispersing Magnetic Nanoparticles into Staggered, Porous Nano‐Frameworks: Weaving and Visualizing Nanoscale Magnetic Flux Lines for Enhanced Electromagnetic Absorption

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 25, 2024

Abstract By dispersing magnetic materials within various nanoscale structural frameworks, a complex and weavable network of fields is created. This not only systematically reconstructs interactions with external electromagnetic but also inversely adjusts its properties, potentially leading to anomalous or enhanced behaviors. However, the challenges lie in finding an effective nano‐framework capable efficiently regulating flux lines visualizing these reconstructed at nanoscale. In this study, Co nanoparticles are strategically dispersed into meticulously layered nanoporous framework bottom upper nanopores exhibiting staggered arrangement. The structure intricately shapes Chinese knot shape, significantly altering characteristics. innovative use advanced situ holography, coupled simulation calculations, has been instrumental modifications lines. Such transformation remarkably enhances material's efficacy absorbing waves, covering Ku band remarkable efficiency even minimal thickness 1.7 mm. Looking ahead, breakthroughs provide roadmap for developing more efficient wave absorbers open up new possibilities manipulating properties technological applications.

Language: Английский

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Single‐Atom Nanozyme‐Like Lanthanum Moieties for High‐Performance Electromagnetic Energy Absorption

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: April 4, 2024

Abstract Single‐atom (SA) nanozymes have unprecedented physicochemical performance due to their integrated merits of both atomically dispersed metal atoms and bio‐enzymes. However, the structure‐function relationship between SA nanozyme‐like structure its dielectric is still unclear. Furthermore, controllable synthesis structures remains challenging unique five‐coordinated configurations. Here, a dicyandiamide‐mediated pyrolysis strategy proposed anchor five nitrogen‐coordinated lanthanum (La)–N 5 moieties on interconnected N‐doped graphene nanocages (La‐N /ING). Theoretical predictions indicate that spatially coordinated La–N exhibit significantly enhanced conduction loss polarization compared 4 moieties, as evidenced by experimental results. Moreover, polydimethylsiloxane‐coated chemically cross‐linked film constructed La‐N /ING aramid nanofibers has outstanding electromagnetic wave (EMW) absorption with an effective bandwidth (EAB 10 ) 6.24 GHz at thickness merely 2.0 mm, outperforming those most reported carbon‐based films. Importantly, also excellent flexibility, hydrophobicity, mechanical strength, structural stability, ensuring application potential in practical environments. These findings provide crucial insights into microscopic environment properties host materials, critical method for preparation multifunctional films spatial SA.

Language: Английский

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