Journal of Materials Chemistry A, Год журнала: 2024, Номер 12(33), С. 21997 - 22012
Опубликована: Янв. 1, 2024
Porous metal microsphere M@C-rGO (metal = Mn, Fe, Co, Ni, Cu) aerogels with high low-frequency microwave absorption, strong thermal insulation and superior anticorrosion performance are successfully constructed.
Язык: Английский
Nano-Micro Letters, Год журнала: 2024, Номер 16(1)
Опубликована: Июнь 11, 2024
Abstract The exploration of novel multivariate heterostructures has emerged as a pivotal strategy for developing high-performance electromagnetic wave (EMW) absorption materials. However, the loss mechanism in traditional is relatively simple, guided by empirical observations, and not monotonous. In this work, we presented semiconductor–semiconductor–metal heterostructure system, Mo–MXene/Mo–metal sulfides (metal = Sn, Fe, Mn, Co, Ni, Zn, Cu), including semiconductor junctions Mott–Schottky junctions. By skillfully combining these distinct functional components (Mo–MXene, MoS 2 , metal sulfides), can engineer multiple heterogeneous interface with superior capabilities, broad effective bandwidths, ultrathin matching thickness. successful establishment gives rise to built-in electric field that intensifies electron transfer, confirmed density theory, which collaborates dielectric polarization mechanisms substantially amplify EMW absorption. We detailed synthesis series featuring both semiconductor–semiconductor semiconductor–metal interfaces. achievements were most pronounced Mo–MXene/Mo–Sn sulfide, achieved remarkable reflection values − 70.6 dB at thickness only 1.885 mm. Radar cross-section calculations indicate MXene/Mo–metal have tremendous potential practical military stealth technology. This work marks departure from conventional component design limitations presents pathway creation advanced MXene-based composites potent capabilities.
Язык: Английский
Процитировано
63
Nano-Micro Letters, Год журнала: 2024, Номер 17(1)
Опубликована: Сен. 27, 2024
Abstract Currently, the demand for electromagnetic wave (EMW) absorbing materials with specific functions and capable of withstanding harsh environments is becoming increasingly urgent. Multi-component interface engineering considered an effective means to achieve high-efficiency EMW absorption. However, modulation has not been fully discussed great potential in field In this study, multi-component tin compound fiber composites based on carbon (CF) substrate were prepared by electrospinning, hydrothermal synthesis, high-temperature thermal reduction. By utilizing different properties substances, rich heterogeneous interfaces are constructed. This effectively promotes charge transfer enhances interfacial polarization conduction loss. The SnS/SnS 2 /SnO /CF abundant have exhibit excellent absorption at a loading 50 wt% epoxy resin. minimum reflection loss (RL) − 46.74 dB maximum bandwidth 5.28 GHz. Moreover, composite coatings exhibited long-term corrosion resistance Q235 steel surfaces. Therefore, study provides strategy design complex environments.
Язык: Английский
Процитировано
63
Nano Letters, Год журнала: 2024, Номер 24(8), С. 2652 - 2660
Опубликована: Фев. 16, 2024
Ideal radar absorbing materials (RAMs) require instantaneous, programmable, and spontaneous adaptability to cope with a complex electromagnetic (EM) environment across the full working frequency. Despite various material systems adaptive mechanisms having been demonstrated, it remains formidable challenge integrate these benefits simultaneously. Here, we present pneumatic matrix that couples morphable MXene/elastomer conductors dielectric spacers, which leverages controllable airflow reconfigure spatial structure between flat sheet hemispherical crown while maintaining resistance stability via wrinkle folding unfolding. The interdimensional reconfigurations drastically induce multiple resonance behavior, enabling remarkable frequency tunability (144.5%), ultrawide bandwidth (15 GHz), weak angular dependence (45° incidence), ultrafast responsiveness (∼30 ms), excellent reproducibility (1000 cycles). With multichannel fluidic conceptual automated control systems, final device demonstrates multiplexed, autonomous transformable mode builds promising platform for smart cloaking.
Язык: Английский
Процитировано
50
Carbon, Год журнала: 2024, Номер 228, С. 119338 - 119338
Опубликована: Июнь 13, 2024
Язык: Английский
Процитировано
47
Nano-Micro Letters, Год журнала: 2024, Номер 17(1)
Опубликована: Сен. 26, 2024
Abstract Atomic-scale doping strategies and structure design play pivotal roles in tailoring the electronic physicochemical property of electromagnetic wave absorption (EMWA) materials. However, relationship between configuration (EM) loss mechanism has remained elusive. Herein, drawing inspiration from DNA transcription process, we report successful synthesis novel situ Mn/N co-doped helical carbon nanotubes with ultrabroad EMWA capability. Theoretical calculation EM simulation confirm that orbital coupling spin polarization Mn–N 4 –C configuration, along cross generated by structure, endow converters enhanced loss. As a result, HMC-8 demonstrates outstanding performance, achieving minimum reflection −63.13 dB at an ultralow thickness 1.29 mm. Through precise tuning graphite domain size, HMC-7 achieves effective bandwidth (EAB) 6.08 GHz 2.02 mm thickness. Furthermore, constructing macroscale gradient metamaterials enables ultrabroadband EAB 12.16 only 5.00 mm, maximum radar section reduction value reaching 36.4 m 2 . This innovative approach not advances understanding metal–nonmetal co-doping but also realizes broadband EMWA, thus contributing to development mechanisms applications.
Язык: Английский
Процитировано
43
Nano-Micro Letters, Год журнала: 2024, Номер 17(1)
Опубликована: Ноя. 18, 2024
Polymeric microwave actuators combining tissue-like softness with programmable microwave-responsive deformation hold great promise for mobile intelligent devices and bionic soft robots. However, their application is challenged by restricted electromagnetic sensitivity intricate sensing coupling. In this study, a sensitized polymeric actuator fabricated hybridizing liquid crystal polymer Ti
Язык: Английский
Процитировано
40
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Апрель 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.
Язык: Английский
Процитировано
37
Advanced Functional Materials, Год журнала: 2024, Номер 34(44)
Опубликована: Май 22, 2024
Abstract Metal single‐atoms implanted on nitrogen‐doped carbon matrices (M‐N x Cs) can effectively adjust local surface electrons and polarization relaxation through coordination structures to significantly enhance the electromagnetic wave (EMW) absorption properties of materials. However, precise construction geometric electronic metal single atoms discovery structure‐absorption relationship at atomic level confront a huge challenge. Herein, this work summarizes latest progress in single‐atom engineering EMW absorbing materials via comprehensive analysis M‐N Cs terms design principles, modulation strategies, structure‐performance correlations. Subsequently, it highlights recent several typical as materials, aiming achieve complete understanding physical effects atomic‐level mechanisms. Finally, current key challenge future directions are presented by focusing functional This provides new insights for development atomically dispersed efficient response functionalities.
Язык: Английский
Процитировано
36
Nano-Micro Letters, Год журнала: 2024, Номер 17(1)
Опубликована: Сен. 26, 2024
Abstract The synthesis of carbon supporter/nanoscale high-entropy alloys (HEAs) electromagnetic response composites by carbothermal shock method has been identified as an advanced strategy for the collaborative competition engineering conductive/dielectric genes. Electron migration modes within HEAs manipulated electronegativity, valence electron configurations and molar proportions constituent elements determine steady state efficiency equivalent dipoles. Herein, enlightened skin-like effect, a reformative using carbonized cellulose paper (CCP) supporter is used to preserve oxygen-containing functional groups (O·) fibers (CCF). Nucleation construction emblematic shell-core CCF/HEAs heterointerfaces are inextricably linked metabolism induced O·. Meanwhile, mode switchable electron-rich sites promotes orientation polarization anisotropic By virtue reinforcement strategy, CCP/HEAs composite prepared 35% ratio Mn element (CCP/HEAs-Mn 2.15 ) achieves efficient wave (EMW) absorption − 51.35 dB at ultra-thin thickness 1.03 mm. mechanisms resulting dielectric properties HEAs-based EMW absorbing materials elucidated combining theoretical calculations with experimental characterizations, which provide bases feasible strategies simulation practical application devices (e.g., ultra-wideband bandpass filter).
Язык: Английский
Процитировано
31
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Июнь 5, 2024
Abstract Hierarchical microarchitecture engineering is a state‐of‐the‐art approach to designing aerogel electromagnetic (EM) wave absorbers, offering huge potential in improving EM energy dissipation. However, the intrinsic feedback mechanism regarding specific influence of each parameter on properties not comprehensively revealed, making it challenging fully utilize aerogels achieve superior absorption performance. Herein, range MXene/rGO‐based with multilevel hierarchical configurations are fabricated by magnetic field‐guided strategy. Leveraging growth thermodynamics effects under field and bridging effect between adjacent rGO units, three models (lamellae ordering, interlayer spacing, layer thickness) constructed aerogels. Remarkably, progressively improve reflection loss ( RL ), effective bandwidth (EAB), matching thickness enhancing dielectric loss, decoupling attenuation‐impedance matching, adjusting power density, respectively. Consequently, exhibit stepwise enhancement performance, achieving −64.6 dB broad EAB 7.0 GHz at 1.8 mm thickness, surpassing alternative other configurations. This work elucidates synergistic multi‐effect dissipation waves aerogels, providing insights for advanced absorbers through diverse strategies.
Язык: Английский
Процитировано
30