Mixed-Dimensional Assembly Strategy to Construct Reduced Graphene Oxide/Carbon Foams Heterostructures for Microwave Absorption, Anti-Corrosion and Thermal Insulation

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

Published: June 17, 2024

Abstract Considering the serious electromagnetic wave (EMW) pollution problems and complex application condition, there is a pressing need to amalgamate multiple functionalities within single substance. However, effective integration of diverse functions into designed EMW absorption materials still faces huge challenges. Herein, reduced graphene oxide/carbon foams (RGO/CFs) with two-dimensional/three-dimensional (2D/3D) van der Waals (vdWs) heterostructures were meticulously engineered synthesized utilizing an efficient methodology involving freeze-drying, immersing absorption, secondary followed by carbonization treatment. Thanks their excellent linkage effect amplified dielectric loss optimized impedance matching, 2D/3D RGO/CFs vdWs demonstrated commendable performances, achieving broad bandwidth 6.2 GHz reflection − 50.58 dB low matching thicknesses. Furthermore, obtained also displayed significant radar stealth properties, good corrosion resistance performances as well outstanding thermal insulation capabilities, displaying great potential in variable environments. Accordingly, this work not only straightforward method for fabricating heterostructures, but outlined powerful mixed-dimensional assembly strategy engineering multifunctional protection, aerospace other conditions.

Language: Английский

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Enhancing Low-Frequency Microwave Absorption Through Structural Polarization Modulation of MXenes

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

Published: June 11, 2024

Two-dimensional carbon-based materials have shown promising electromagnetic wave absorption capabilities in mid- and high-frequency ranges, but face challenges low-frequency due to limited control over polarization response mechanisms ambiguous resonance behavior. In this study, we propose a novel approach enhance efficiency aligned three-dimensional (3D) MXene/CNF (cellulose nanofibers) cavities by modifying properties manipulating the 3D MXene architecture. This controlled mechanism results significant shift of main region from X-band S-band, leading remarkable reflection loss value - 47.9 dB range. Furthermore, our findings revealed importance oriented coupling influencing microwave properties. The present study inspired us develop generic strategy for tuned absence magnetic element participation, while orientation-induced derived are key controlling factors method.

Language: Английский

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Dendrimer-assisted defect and morphology regulation for improving optical, hyperthermia, and microwave-absorbing features

Dalton Transactions, Journal Year: 2024, Volume and Issue: 53(9), P. 4222 - 4236

Published: Jan. 1, 2024

A promising pathway to design multifunctional and practical microwave absorbing/shielding materials promote their optical, magnetic, hyperthermia, other properties via facile affordable methods.

Language: Английский

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Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Langmuir, Journal Year: 2024, Volume and Issue: 40(23), P. 12148 - 12158

Published: May 28, 2024

During the past decade, ever-increasing electromagnetic pollution has excited a global concern. A sustainable resource, facile experimental scenario, fascinating reflection loss (RL), and broad efficient bandwidth are substantial factors that intrigue researchers. This research led to achievement of brilliant microwave-absorbing material by treating pampas as biomass. The carbon-based microfibers attained biowaste were treated plasma under diverse environments amplify their features. Moreover, pyrolysis scenario was performed compare results. reductive processes H2 carbonization. However, CO2 regulate heteroatoms defects. Interestingly, polystyrene (PS) applied matrix. aromatic rings existing in absorbing medium establish electrostatic interactions, elevating interfacial polarization, physical characteristics PS augment practical applications final product. manipulated biomasses characterized Raman, X-ray diffraction, energy-dispersive spectroscopy, field emission scanning electron microscopy, diffuse spectroscopy analyses. Eventually, features estimated vector network analyzer. plasma-treated H2/Ar blended with gained maximum RL −90.65 dB at 8.79 GHz an (RL ≤ −10 dB) 4.24 thickness 3.20 mm; meanwhile, treatment 97.99 14.92 7.74 2.05 mm thickness. Particularly, biomass plasmolyzed Ar covered entire X Ku bands 2.10 mm. Notably, total shielding efficiencies bioinspired materials up ≈99%, desirable for applications.

Language: Английский

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Absorption–Reflection–Transmission Power Coefficient Guiding Gradient Distribution of Magnetic MXene in Layered Composites for Electromagnetic Wave Absorption

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: Feb. 17, 2025

Abstract The morphological distribution of absorbent in composites is equally important with absorbents for the overall electromagnetic properties, but it often ignored. Herein, a comprehensive consideration including component regulation, layered arrangement structure, and gradient concentration was used to optimize impedance matching enhance loss. On microscale, incorporation magnetic Ni nanoparticles into MXene nanosheets (Ni@MXene) endows suitable intrinsic permittivity permeability. macroscale, Ni@MXene increases effective interaction area waves, inducing multiple reflection/scattering effects. this basis, according analysis absorption, reflection, transmission (A–R–T) power coefficients composites, constructed realize at low-concentration surface layer, loss middle interlayer microwave reflection high-concentration bottom layer. Consequently, composite (LG5-10–15) achieves complete absorption coverage X-band thickness 2.00–2.20 mm RL min −68.67 dB 9.85 GHz 2.05 mm, which 199.0%, 12.6%, 50.6% higher than non-layered, descending respectively. Therefore, work confirms importance structure improving performance broadens design high-performance materials.

Language: Английский

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A comprehensive review of the advancement of transition metal oxide nanocomposites for microwave absorption

Coordination Chemistry Reviews, Journal Year: 2025, Volume and Issue: 533, P. 216535 - 216535

Published: Feb. 27, 2025

Language: Английский

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Integration of Electrical Properties and Polarization Loss Modulation on Atomic Fe–N-RGO for Boosting Electromagnetic Wave Absorption

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 17(1)

Published: Oct. 18, 2024

Abstract Developing effective strategies to regulate graphene's conduction loss and polarization has become a key expanding its application in the electromagnetic wave absorption (EMWA) field. Based on unique energy band structure of graphene, regulating bandgap electrical properties by introducing heteroatoms is considered feasible solution. Herein, metal-nitrogen doping reduced graphene oxide (M–N-RGO) was prepared embedding series single metal atoms M–N 4 sites (M = Mn, Fe, Co, Ni, Cu, Zn, Nb, Cd, Sn) RGO using an N-coordination atom-assisted strategy. These composites had adjustable conductivity optimize dielectric impedance matching for efficient EMWA performance. The results showed that minimum reflection ( RL min ) Fe–N-RGO reaches − 74.05 dB (2.0 mm) maximum bandwidth (EAB max 7.05 GHz (1.89 even with low filler loading only 1 wt%. Combined X-ray spectra (XAFS), atomic force microscopy, density functional theory calculation analysis, Fe–N can be used as center increase dipole polarization, interface defect-induced due d-p orbital hybridization structural distortion. Moreover, electron migration within Fe further leads loss, thereby synergistically promoting attenuation. This study demonstrates effectiveness graphene′s properties, which provides important basis investigation mechanism.

Language: Английский

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Investigating the structural and electromagnetic properties of ZnFe2O4@MWCNTs nanocomposites

Diamond and Related Materials, Journal Year: 2024, Volume and Issue: 149, P. 111652 - 111652

Published: Oct. 9, 2024

Language: Английский

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Radial Dielectric Gradient Core–Shell Ce/NiCo@C Composites for Simultaneous Electromagnetic Wave Absorption and Antibacterial Activity via Ce³⁺/Ce⁴⁺ Valence Modulation

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 4, 2025

Abstract The increasing demand for multifunctional materials that combine electromagnetic wave (EMW) absorption and antibacterial properties has driven the development of novel capable meeting these challenges. Here, a core–shell Ce/NiCo@C composite with radial dielectric gradient structure is presented, designed to enhance EMW exhibit potent activity. material's unique architecture, which includes multilayered configuration distribution Ce 3+ /Ce 4+ valence states, modulates constant promotes electron migration polarization under exposure. This design results in broad effective bandwidth 7.12 GHz, minimum reflection loss (RL min ) −67.2 dB at thickness 1.94 mm. Additionally, reversible transition between generates reactive oxygen species (ROS), disrupt microbial cell membranes inhibit bacterial growth. demonstrates sterilization rate exceeding 99% against E. coli significant bactericidal effect S. aureus . work highlights potential integrating valence‐modulated, advanced antimicrobial applications, offering promising approach future diverse technological fields.

Language: Английский

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Morphology-Controlled In₂O₃ Nanomaterials with Excellent Electromagnetic Wave Absorption Properties

ACS Applied Electronic Materials, Journal Year: 2024, Volume and Issue: 6(7), P. 5283 - 5292

Published: June 25, 2024

In the field of electromagnetic wave (EMW) absorption, development nonmagnetic materials with strong absorptive performance, low filling ratio, and wide bandwidth is significant importance. this work, five morphologies In2O3 nanomaterials are prepared by simple hydrothermal annealing processes. The products (including lamellar flower-, lychee-, cheese-, nanocube-, urchin-like In2O3) obtained using different surfactants. experimental results indicate that flower-like has a minimum reflection loss (RLmin) −52.04 dB (1.74 mm) an effective absorption (EAB) 5.97 GHz (1.92 mm). Correspondingly, RLmin EAB lychee-like −70.61 (2.55 5.57 (1.72 mm), respectively. A large specific surface area about can effectively increase scattering paths EMW inside absorbing material, which beneficial for attenuation EMW. This work not only demonstrates great potential in practical applications but also extends research on field.

Language: Английский

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