Hollow engineering of sandwich NC@Co/NC@MnO2 composites toward strong wideband electromagnetic wave attenuation

Journal of Material Science and Technology, Journal Year: 2023, Volume and Issue: 175, P. 194 - 203

Published: Sept. 6, 2023

Language: Английский

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Multicomponent Nanoparticles Synergistic One-Dimensional Nanofibers as Heterostructure Absorbers for Tunable and Efficient Microwave Absorption

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 15(1)

Published: Dec. 15, 2022

Application of novel radio technologies and equipment inevitably leads to electromagnetic pollution. One-dimensional polymer-based composite membrane structures have been shown be an effective strategy obtain high-performance microwave absorbers. Herein, we reported a one-dimensional N-doped carbon nanofibers material which encapsulated the hollow Co3SnC0.7 nanocubes in fiber lumen by electrospinning. Space charge stacking formed between nanoparticles can channeled longitudinal fibrous structures. The dielectric constant fibers is highly related carbonization temperature, great impedance matching achieved synergetic effect network. At 800 °C, necklace-like Co3SnC0.7/CNF with 5% low load achieves excellent RL value - 51.2 dB at 2.3 mm absorption bandwidth 7.44 GHz thickness 2.5 mm. multiple wave (EMW) reflections interfacial polarization internal contribute major attenuating EMW. These strategies for regulating performance expanded other functional materials facilitate development emerging

Language: Английский

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Green EMI shielding: Dielectric/magnetic “genes” and design philosophy

Carbon, Journal Year: 2023, Volume and Issue: 206, P. 124 - 141

Published: Feb. 9, 2023

Language: Английский

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Multifunctional MXene/C Aerogels for Enhanced Microwave Absorption and Thermal Insulation

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: Aug. 9, 2023

Two-dimensional transition metal carbides and nitrides (MXene) have emerged as promising candidates for microwave absorption (MA) materials. However, they also some drawbacks, such poor impedance matching, high self-stacking tendency, density. To tackle these challenges, MXene nanosheets were incorporated into polyacrylonitrile (PAN) nanofibers subsequently assembled a three-dimensional (3D) network structure through PAN carbonization, yielding MXene/C aerogels. The 3D effectively extends the path of microcurrent transmission, leading to enhanced conductive loss electromagnetic (EM) waves. Moreover, aerogel's rich pore significantly improves matching while reducing density MXene-based absorbers. EM parameter analysis shows that aerogels exhibit minimum reflection (RLmin) value - 53.02 dB (f = 4.44 GHz, t 3.8 mm), an effective bandwidth (EAB) 5.3 GHz (t 2.4 mm, 7.44-12.72 GHz). Radar cross-sectional (RCS) simulations employed assess radar stealth effect aerogels, revealing maximum RCS reduction perfect electric conductor covered by aerogel reaches 12.02 m2. In addition MA performance, demonstrates good thermal insulation 5-mm-thick can generate temperature gradient over 30 °C at 82 °C. This study provides feasible design approach creating lightweight, efficient, multifunctional

Language: Английский

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Graphene Oxide‐Assisted Multiple Cross‐Linking of MXene for Large‐Area, High‐Strength, Oxidation‐Resistant, and Multifunctional Films

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(11)

Published: Dec. 30, 2022

Abstract Transition metal carbides/nitrides (MXenes) with metallic electrical conductivity and excellent processability attract increasing attention for assembling multifunctional macrostructures. However, the challenges, involving poor mechanical strength, inferior oxidation stability, limited scalable manufacturing, impede their wide applications. Herein, large‐area, high‐strength, ultra‐flexible hybrid films are developed through multiple physical chemical cross‐linking of MXene/cellulose facilitated by graphene oxide. The MXene‐based manifest significantly improved hydrophobicity, water/solvent resistance, meanwhile, maintain electromagnetic interference shielding performance. X‐band surface‐specific effectiveness (SE) 18,837.5 dB cm 2 g −1 an SE over 60 in ultra‐broadband frequency range achieved, comparable to best shields ever reported. Furthermore, wearable demonstrate photothermal antibacterial electrothermal deicing Thus, such high‐performance a facile manufacturing method have substantial application prospects flexible electronics, thermotherapy, compatibility, aerospace.

Language: Английский

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Hyperelastic, Robust, Fire‐Safe Multifunctional MXene Aerogels with Unprecedented Electromagnetic Interference Shielding Efficiency

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(49)

Published: Sept. 5, 2023

Abstract MXene aerogels have shown great potential for many important functional applications, in particular electromagnetic interference (EMI) shielding. However, it has been a grand challenge to create mechanically hyperelastic, air‐stable, and durable enabling effective EMI protection at low concentrations due the difficulties achieving tailorable porous structures, excellent mechanical elasticity, desired antioxidation capabilities of air. Here, facile strategy fabricating composite by co‐assembling cellulose nanofibers during freeze‐drying followed surface encapsulation with fire‐retardant thermoplastic polyurethane (TPU) is reported. Because maximum utilization pore structures MXene, conductive loss enhanced multiple internal reflections, as‐prepared aerogel 3.14 wt% exhibits an exceptionally high shielding effectiveness 93.5 dB, ultra‐high efficiency 2977.71 dB g −1 , tripling values previous works. Owing presence hydrogen bonding TPU elastomer, hyperelastic feature additional strength, stability, superior durability, fire safety. This study provides creating multifunctional applications protection, wearable devices, thermal management, pressure sensing, intelligent monitoring.

Language: Английский

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Advancements in Microwave Absorption Motivated by Interdisciplinary Research

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(4)

Published: Oct. 23, 2023

Abstract Microwave absorption materials (MAMs) are originally developed for military purposes, but have since evolved into versatile with promising applications in modern technologies, including household use. Despite significant progress bench‐side research over the past decade, MAMs remain limited their scope and yet to be widely adopted. This review explores history of from first‐generation coatings second‐generation functional absorbers, identifies bottlenecks hindering maturation. It also presents potential solutions such as exploring broader spatial scales, advanced characterization, introducing liquid media, utilizing novel toolbox (machine learning, ML), proximity lab end‐user. Additionally, it meticulously compelling medicine, mechanics, energy, optics, sensing, which go beyond efficiency, along current development status prospects. interdisciplinary direction differs previous primarily focused on meeting traditional requirements (i.e., thin, lightweight, wide, strong), can defined next generation smart absorbers. Ultimately, effective utilization ubiquitous electromagnetic (EM) waves, aided by third‐generation MAMs, should better aligned future expectations.

Language: Английский

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Functional Tailoring of Multi‐Dimensional Pure MXene Nanostructures for Significantly Accelerated Electromagnetic Wave Absorption

Small, Journal Year: 2023, Volume and Issue: 19(41)

Published: June 8, 2023

Transition metal carbide (Ti3 C2 Tx MXene), with a large specific surface area and abundant functional groups, is promising candidate in the family of electromagnetic wave (EMW) absorption. However, high conductivity MXene limits its EMW absorption ability, so it remains challenge to obtain outstanding attenuation ability pure MXene. Herein, by integrating HF etching, KOH shearing, high-temperature molten salt strategies, layered (L-MXene), network-like nanoribbons (N-MXene NRs), porous monolayer (P-MXene ML), layer L) are rationally constructed favorable microstructures states for HF, KOH, KCl/LiCl used functionalize tune microstructure state (F- , OH- Cl- terminals), thereby improving capacity MXene-based nanostructures. Impressively, unique structure, proper electrical conductivity, area, defects, nanostructures achieve good impedance matching, dipole polarization, conduction loss, thus inheriting excellent performance. Consequently, L-MXene, N-MXene NRs, P-MXene ML, L enable reflection loss (RL ) value -43.14, -63.01, -60.45, -56.50 dB matching thickness 0.95, 1.51, 3.83, 4.65 mm, respectively.

Language: Английский

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CrN attached multi-component carbon nanotube composites with superior electromagnetic wave absorption performance

Carbon, Journal Year: 2023, Volume and Issue: 208, P. 1 - 9

Published: March 9, 2023

Language: Английский

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Construction of dual heterogeneous interface between zigzag-like Mo–MXene nanofibers and small CoNi@NC nanoparticles for electromagnetic wave absorption

Journal of Advanced Ceramics, Journal Year: 2023, Volume and Issue: 12(8), P. 1562 - 1576

Published: May 24, 2023

Two-dimensional (2D) transition metal carbides (MXene) process attractive conductivity and abundant surface functional groups, providing immense potential in the field of electromagnetic wave (EMW) absorption. However, high spontaneous aggregation MXene suffer from limited EMW response. Inspired by dielectric-magnetic synergy effect, strategy decorating with magnetic elements is expected to solve this challenge. In work, zigzag-like Mo₂TiC₂ nanofiber (Mo-MXene NFs) cross-linked networks are fabricated using HF etching KOH shearing processes. Subsequently, Co-MOF derived CoNi LDH ultrathin nanosheets grown inside Mo-MXene NFs, N-doped carbon matrix anchored alloy nanoparticles formed pyrolysis firmly embedded NFs network. Benefiting synergistic effect highly dispersed small nanoparticles, a 3D conductive network assembled numerous hollow vesicles, dual heterogeneous interface, designed Mo-MXene/CoNi-NC heterostructure provides robust absorption ability reflection loss (R_L) value -68.45 dB at matching thickness 4.38 mm. The performance can be attributed excellent dielectric losses, loss, impedance matching, multiple scattering triggered unique structure. This work puts up great developing advanced MXene-based devices.

Language: Английский

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