Construction of Chiral‐Magnetic‐Dielectric Trinity Structures with Different Magnetic Systems for Efficient Low‐Frequency Microwave Absorption

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 27, 2024

Abstract The fabrication of carbon nanocoil (CNC)‐based chiral‐dielectric‐magnetic trinity composites holds great significance in low‐frequency microwave absorption fields. However, it is not clear that how the different magnetic systems affect and frequency responses composites. Herein, four types metals, FeCo, CoNi, FeNi, FeCoNi, are selected to be combined with chiral templates respectively, resulting similar morphology. CNC endow all excellent dielectric loss. Further permeability analysis micro‐magnetic simulation confirm response region can well adjusted by changing specific resonance modes domain motion. Due synergistic effect between magnetism, chirality, dielectricity, FeNi‐based exhibit best performance. minimum RL −60.7 dB achieved at 6.7 GHz an ultra‐low filling ratio 10%, EAB value extended 3.7 GHz. This study provides further guidelines for design absorption.

Language: Английский

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Polarization loss in rutile TiO2 doped with acceptor ions for microwave absorption

Applied Surface Science, Journal Year: 2024, Volume and Issue: 671, P. 160767 - 160767

Published: July 17, 2024

Language: Английский

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Reconfigurable Origami/Kirigami Metamaterial Absorbers Developed by Fast Inverse Design and Low-Concentration MXene Inks

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 16(32), P. 42448 - 42460

Published: July 30, 2024

Reconfigurable metamaterial absorbers (MAs), consisting of tunable elements or deformable structures, are able to transform their absorbing bandwidth and amplitude in response environmental changes. Among the options for building reconfigurable MAs, origami/kirigami structures show great potential because ability combine excellent mechanical electromagnetic (EM) properties. However, neither trial-and-error-based design method nor complex fabrication process can meet requirement developing high-performance MAs. Accordingly, this work introduces a deep-learning-based algorithm realize fast inverse origami Then, an accordion-origami coding MA is generated with EM responses that be smoothly transformed between ultrabroadband absorption (5.5–20 GHz, folding angle α = 82°) high reflection (2–20 RL > −1.5 dB, 0°) under y-polarized waves. asymmetric pattern deformation lead typical polarization-sensitive performance −4 < 90°) x-polarized For first time, kirigami polarization rotation surface switchable operation band adapted balance orthogonal polarized As result, stacked origami-kirigami maintains polarization-insensitive (4.4–20 GHz) at β 0° could into narrowband absorber through deformation. Besides, possess properties such as low relative density, negative Poisson's ratio, specific energy absorption. Moreover, by modulating PEDOT:PSS conductive bridges among MXene nanosheets, series low-concentration MXene-PEDOT:PSS inks (∼46 mg·mL–1) adjustable square resistance (5–32.5 Ω/sq) developed fabricate metamaterials via screen printing. Owing universal scheme, supplies promising paradigm low-cost absorbers.

Language: Английский

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Absorption-diffusion integrated stacked metamaterials by multi-compound strategy for broadband electromagnetic attenuation

Composites Science and Technology, Journal Year: 2024, Volume and Issue: 255, P. 110735 - 110735

Published: June 29, 2024

Language: Английский

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Self-assembly Ti3C2Tx MXene/ZnCo2O4@ZnO heterostructure with Schottky junction for regulating BIEF to enhance microwave absorption

Applied Surface Science, Journal Year: 2024, Volume and Issue: unknown, P. 161393 - 161393

Published: Oct. 1, 2024

Language: Английский

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