Carbon nanolayer-mounted single metal sites enable dipole polarization loss under electromagnetic field DOI Creative Commons

Siyao Cheng,

Daohu Sheng,

Soumya Mukherjee

et al.

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Oct. 21, 2024

Surface modulation strategies have spurred great interest with regard to regulating the morphology, dispersion and flexible processability of materials. Unsurprisingly, customized surfaces is primed offer a route control their electronic functions. To regulate electromagnetic wave (EMW) absorption applications by surface engineering an unmet challenge. Thanks pyrolyzing surface-anchored metal-porphyrin, here we report on four-nitrogen atoms-confined single metal site nitrogen-doped carbon layer (sM(N4)@NC, M = Ni, Co, Cu, Ni/Cu) (sM=single metal; NC= layer) that registers absorption. Surface-anchored metal-porphyrins are afforded attaching them onto polypyrrole via prototypical click reaction. Further, sM(N4)@NC experimentally found elicit identical dipole polarization loss mechanism, overcoming handicaps conductivity loss, defects, interfacial among current EMW absorber models. Importantly, exhibit effective bandwidth 6.44 reflection −51.7 dB, preceding state-of-the-art carbon-based absorbers. This study introduces strategy design absorbers based sites enable fine-tunable controlled mechanism atomistic precision. In this work, Cheng et al. unique dipole-dominated model excluding other redundant opening avenue for exploring future academic studies industrially applicable absorbing

Language: Английский

Advancements in Microwave Absorption Motivated by Interdisciplinary Research DOI Open Access
Zehao Zhao, Yuchang Qing, Luo Kong

et al.

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

Citations

136
Boosting Interfacial Polarization Through Heterointerface Engineering in MXene/Graphene Intercalated-Based Microspheres for Electromagnetic Wave Absorption DOI Creative Commons
Ge Wang, Changfeng Li, Diana Estévez

et al.

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

Published: June 7, 2023

Multi-layer 2D material assemblies provide a great number of interfaces beneficial for electromagnetic wave absorption. However, avoiding agglomeration and achieving layer-by-layer ordered intercalation remain challenging. Here, 3D reduced graphene oxide (rGO)/MXene/TiO2/Fe2C lightweight porous microspheres with periodical intercalated structures pronounced interfacial effects were constructed by spray-freeze-drying microwave irradiation based on the Maxwell-Wagner effect. Such approach reinforced via defects introduction, skeleton, multi-layer assembly multi-component system, leading to synergistic loss mechanisms. The abundant 2D/2D/0D/0D heterojunctions in high density polarization charges while generating sites, resulting boosted polarization, which is verified CST Microwave Studio simulations. By precisely tuning nanosheets heterostructures, both impedance matching improve significantly. At low filler loading 5 wt%, rate exceeds 70%, minimum reflection (RLmin) -67.4 dB can be achieved. Moreover, radar cross-section simulations further confirm attenuation ability optimized microspheres. These results not only novel insights into understanding enhancing effects, but also constitute an attractive platform implementing heterointerface engineering customized hierarchical architectures.

Language: Английский

Citations

127
Sequential Architecture Induced Strange Dielectric‐Magnetic Behaviors in Ferromagnetic Microwave Absorber DOI
Fei Pan, Mingqiang Ning, Zhenhua Li

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(27)

Published: March 27, 2023

Abstract The high filler loading (FL) is a bottleneck in developing lightweight ferromagnetic microwave absorbers (MAs) for the actual applications. Sequential architecture design of MAs can induce strange physical behaviors due to unique coupling‐enhancement effect between functional units, providing vast potential achieving absorption performance. However, FLs current sequential fail be designed on demand because dielectric‐magnetic cannot fulfilled. influence engineering macroscopic properties or microscopic loss mechanism still needs more exploration. Herein, based four mesoscopic models (particles, chains, bundles, and fibers) series with different architectures are prepared via bottom‐up self‐assembly method. fibrous samples exhibit best performance (−51.3 dB, 4.12 GHz) at breakthrough FL 2 wt%, which one order magnitude less than other MAs. Strange behaviors, including negative permittivity heterodromous chiral vortex, occur units lateral configurations. Further, special established reveal attenuation evolutionary mechanism. This study clarifies relationship provides new sight understand electromagnetic

Language: Английский

Citations

119
Nitrogen-Doped Magnetic-Dielectric-Carbon Aerogel for High-Efficiency Electromagnetic Wave Absorption DOI Creative Commons
Shijie Wang, Xue Zhang,

Shuyan Hao

et al.

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

Published: Nov. 17, 2023

Abstract Carbon-based aerogels derived from biomass chitosan are encountering a flourishing moment in electromagnetic protection on account of lightweight, controllable fabrication and versatility. Nevertheless, developing facile construction method component design with carbon-based for high-efficiency wave absorption (EWA) materials broad effective bandwidth (EAB) strong yet hits some snags. Herein, the nitrogen-doped magnetic-dielectric-carbon aerogel was obtained via ice template followed by carbonization treatment, homogeneous abundant nickel (Ni) manganese oxide (MnO) particles situ grew carbon aerogels. Thanks to optimization impedance matching dielectric/magnetic components aerogels, (Ni/MnO-CA) suggests praiseworthy EWA performance, an ultra-wide EAB 7.36 GHz minimum reflection loss (RL min ) − 64.09 dB, while achieving specific 253.32 dB mm −1 . Furthermore, reveals excellent radar stealth, infrared thermal management capabilities. Hence, high-performance, easy fabricated multifunctional nickel/manganese oxide/carbon have application aspects protection, electronic devices aerospace.

Language: Английский

Citations

96
Ultrasonic Field Induces Better Crystallinity and Abundant Defects at Grain Boundaries to Develop CuS Electromagnetic Wave Absorber DOI
Geng Chen, Hongsheng Liang, Jijun Yun

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(49)

Published: Aug. 11, 2023

Ultrasonic field (USF) is widely used to regulate the intrinsic properties of materials that are not applied in electromagnetic wave (EMW) absorption. One reason lack a response mechanism for USF hinders expansion their EMW absorption performance. Therefore, address this issue, series CuS nanoparticles with diverse anions constructed presence or absence USF. The ultrasonic-induced cavitation effect can significantly promote crystallization and lead accumulation S defects at grain boundaries (GBs). Furthermore, GBs easily oriented arranged, allowing polarization relaxation retention be maintained 10 wt%. Consequently, nitrate precursor under shows an optimum effective bandwidth (EAB) 10.24 GHz thickness 3.5 mm, which 228.6% more than without chloride also achieves EAB 3.92 GHz, even considerably low filler ratio. Thus, study demonstrates first time provides novel technique optimize performance semiconductors.

Language: Английский

Citations

95
Structural Design for EMI Shielding: From Underlying Mechanisms to Common Pitfalls DOI Creative Commons
Ali Akbar Isari,

Ahmadreza Ghaffarkhah,

Seyyed Alireza Hashemi

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(24)

Published: March 12, 2024

Abstract Modern human civilization deeply relies on the rapid advancement of cutting‐edge electronic systems that have revolutionized communication, education, aviation, and entertainment. However, electromagnetic interference (EMI) generated by digital poses a significant threat to society, potentially leading future crisis. While numerous efforts are made develop nanotechnological shielding mitigate detrimental effects EMI, there is limited focus creating absorption‐dominant solutions. Achieving EMI shields requires careful structural design engineering, starting from smallest components considering most effective wave attenuating factors. This review offers comprehensive overview structures, emphasizing critical elements design, mechanisms, limitations both traditional shields, common misconceptions about foundational principles science. systematic serves as scientific guide for designing structures prioritize absorption, highlighting an often‐overlooked aspect

Language: Английский

Citations

87
Rational construction of mushroom-like Ni@N-doped carbon tubes composites with enhanced electromagnetic wave absorption DOI
Dan Wu, Jie Jiang,

Shuanglin Deng

et al.

Journal of Alloys and Compounds, Journal Year: 2023, Volume and Issue: 963, P. 171230 - 171230

Published: July 3, 2023

Language: Английский

Citations

76
Constructing Multiphase‐Induced Interfacial Polarization to Surpass Defect‐Induced Polarization in Multielement Sulfide Absorbers DOI Creative Commons

Shengchong Hui,

Xu Zhou, Limin Zhang

et al.

Advanced Science, Journal Year: 2023, Volume and Issue: 11(6)

Published: Dec. 3, 2023

Abstract The extremely weak heterointerface construction of high‐entropy materials (HEM) hinders them being the electromagnetic wave (EMW) absorbers with ideal properties. To address this issue, study proposes multiphase interfacial engineering and results in a multiphase‐induced polarization loss multielement sulfides. Through selection atoms diverse reaction activities, components CuS (1 0 5), Fe 0.5 Ni S 2 (2 1 0), CuFe 3 0) are constructed to enhance Cu‐based Compared single‐phase Zn‐based sulfides (ZnFeCoNiCr‐S), (CuFeCoNiCr‐S) possess optimized EMW absorption properties (effective bandwidth (EAB) 6.70 GHz at 2.00 mm) due existence specific interface 5)/CuFe proper EM parameters. Furthermore, ZnFeCoNiCr‐S into FeNi 4 (3 1)/(Zn, Fe)S 1) through 400 °C heat‐treated is decomposed. enhanced by strong (EAB 4.83 1.45 mm). This work reveals reasons for limited improve charge accumulation between interfaces, leading

Language: Английский

Citations

75
A Regulable Polyporous Graphite/Melamine Foam for Heat Conduction, Sound Absorption and Electromagnetic Wave Absorption DOI

Zijing Li,

Limin Zhang, Hongjing Wu

et al.

Small, Journal Year: 2023, Volume and Issue: 20(11)

Published: Nov. 5, 2023

Abstract To reduce electromagnetic interference and noise pollution within communication base stations servers, it is necessary for wave absorption (EWA) materials to transition from coating multifunctional devices. Up now, the stable effective integration of multiple functions into one material by a simple method has remained large challenge. Herein, foam‐type microwave device assembled with multicomponent organic matter graphite powder synthesized universal combination process. Melamine phenolic aldehyde amine work as skeleton cementing compound, respectively, in which embedded compound interconnected mesoscopic 3D electric conductive heat network. Interestingly, prepared flexible graphite/melamine foam (CMF) delivers great EWA performance, bandwidth 9.8 GHz, ultrathin thickness 2.60 mm, strong reflection loss −41.7 dB. Moreover, CMF possesses porosity flexibility, endowing sound ability. The unique its EWA, conduction, absorption, mechanical robustness, well cost‐effective scalable manufacturing. These attributes make promising widely used stations, chips protection.

Language: Английский

Citations

68
Pore-regulation in 2D biochar-based flakes towards wideband microwave absorption DOI
Han Yan, Zhichao Lou, Lei Xu

et al.

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 464, P. 142568 - 142568

Published: March 31, 2023

Language: Английский

Citations

55