Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Advanced Science, Journal Year: 2022, Volume and Issue: 9(10)

Published: Feb. 7, 2022

Electromagnetic (EM) wave absorbing materials play an increasingly important role in modern society for their multi-functional military stealth and incoming 5G smart era. Dielectric loss EM absorbers underlying mechanism investigation are of great significance to unveil attenuation behaviors guide novel dielectric design. However, current researches focus more on synthesis rather than in-depth study. Herein, comprehensive views toward mechanisms including interfacial polarization, dipolar conductive loss, defect-induced polarization provided. Particularly, some misunderstandings ambiguous concepts each highlighted. Besides, study emphasized. Moreover, new regulation strategies instead regular components compositing summarized provide inspiring thoughts simple effective behavior modulation.

Language: Английский

---

Electromagnetic absorption materials: Current progress and new frontiers

Progress in Materials Science, Journal Year: 2022, Volume and Issue: 127, P. 100946 - 100946

Published: March 17, 2022

Language: Английский

---

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Nano-Micro Letters, Journal Year: 2021, Volume and Issue: 13(1)

Published: Aug. 16, 2021

Layered double hydroxides (LDHs) have a special structure and atom composition, which are expected to be an excellent electromagnetic wave (EMW) absorber. However, it is still problem that obtaining EMW-absorbing materials from LDHs. Herein, we designed heterostructure NiCo-LDHs@ZnO nanorod then subsequent heat treating derive NiCo@C/ZnO composites. Finally, with the synergy of dielectric loss magnetic loss, outstanding absorption performance could achieved reflection - 60.97 dB at matching thickness 2.3 mm, widest bandwidth 6.08 GHz was realized 2.0 mm. Moreover, this research work provides reference for development utilization LDHs in field microwave can also provide ideas design layered structural absorbers.

Language: Английский

---

Confined Diffusion Strategy for Customizing Magnetic Coupling Spaces to Enhance Low‐frequency Electromagnetic Wave Absorption

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(16)

Published: Feb. 7, 2023

Abstract The rational design of magnetic composites has great potential for electromagnetic (EM) absorption, particularly in the low‐frequency range 2–8 GHz. However, scalable synthesis such absorbers with both high content and good dispersity remains challenging. In this study, a confined diffusion strategy is proposed to fabricate functional magnetic‐carbon hollow microspheres. Driven by ferromagnetic enhanced Kirkendall effect, situ alloying FeCo nanoparticles tightly carbon shells, effectively inhibiting agglomeration. Moreover, core–shell FeCo–carbon nano‐units further assemble into dispersive microscale Janus bulges on inner outer surfaces microsphere. optimized FeCo@C microspheres exhibit excellent EM wave absorption performance: minimum reflection loss ( RL min ) −35.9 dB, bandwidth covers almost entire C‐band. Systematic investigation reveals that large size integration, high–density units, strong coupling are essential enhancing dissipation waves. This study provides novel fabricating advanced significant inspiration investigating attenuation mechanism at low frequency.

Language: Английский

---

State of the Art and Prospects in Metal-Organic Framework-Derived Microwave Absorption Materials

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: Feb. 26, 2022

Abstract Microwave has been widely used in many fields, including communication, medical treatment and military industry; however, the corresponding generated radiations have novel hazardous sources of pollution threating human’s daily life. Therefore, designing high-performance microwave absorption materials (MAMs) become an indispensable requirement. Recently, metal–organic frameworks (MOFs) considered as one most ideal precursor candidates MAMs because their tunable structure, high porosity large specific surface area. Usually, MOF-derived exhibit excellent electrical conductivity, good magnetism sufficient defects interfaces, providing obvious merits both impedance matching loss. In this review, recent research progresses on were profoundly reviewed, categories MOFs MOF composites precursors, design principles, preparation methods relationship between mechanisms microstructures MAMs. Finally, current challenges prospects for future opportunities are also discussed. "Image missing"

Language: Английский

---

New generation electromagnetic materials: harvesting instead of dissipation solo

Science Bulletin, Journal Year: 2022, Volume and Issue: 67(14), P. 1413 - 1415

Published: June 21, 2022

Language: Английский

---

Ultralight Magnetic and Dielectric Aerogels Achieved by Metal–Organic Framework Initiated Gelation of Graphene Oxide for Enhanced Microwave Absorption

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: April 19, 2022

Metal-organic frameworks (MOFs) are used to directly initiate the gelation of graphene oxide (GO), producing MOF/rGO aerogels. The ultralight magnetic and dielectric aerogels show remarkable microwave absorption performance with ultralow filling contents. development a convenient methodology for synthesizing hierarchically porous comprising metal-organic (GO) building blocks that exhibit an density uniformly distributed MOFs on GO sheets is important various applications. Herein, we report facile route MOF/reduced (rGO) based GO, which initiated using MOF crystals. Free metal ions exposed surface MIL-88A nanorods act as linkers bind nanosheets three-dimensional network via metal-oxygen covalent or electrostatic interactions. MOF/rGO-derived Fe3O4@C/rGO Ni-doped notable (MA) performance, simultaneously achieving strong broad bandwidth at low thickness 2.5 (- 58.1 dB 6.48 GHz) 2.8 mm 46.2 7.92 contents 0.7 0.6 wt%, respectively. attenuation ability prepared further confirmed radar cross-sectional simulation, attributed synergistic effects their structures heterointerface engineering. This work provides effective pathway fabricating hybrid offers MA.

Language: Английский

---

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

---

CoFe2O4/porous carbon nanosheet composites for broadband microwave absorption

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 427, P. 130796 - 130796

Published: June 11, 2021

Language: Английский

---

The art of framework construction: hollow-structured materials toward high-efficiency electromagnetic wave absorption

Advanced Composites and Hybrid Materials, Journal Year: 2022, Volume and Issue: 5(3), P. 1658 - 1698

Published: June 17, 2022

Language: Английский

---