SiO2–modified APTMS nanocoatings encapsulating FeNi: Amplifying microwave absorption and corrosion resistance

Guo, Yang; Lu, Haipeng; Jian, Xian

doi:10.1016/j.apsusc.2023.159286

Cited by 9 publications

(1 citation statement)

References 57 publications

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“…Electromagnetic waves (EMWs) play a crucial role in modern communication technology, significantly contributing to the development and progress of human society. − However, the escalating issue of electromagnetic pollution poses adverse effects on human health and hampers the advancement of electronic information technology. − Consequently, there is a pressing need for the development of advanced EMWs absorption materials characterized by low density, small thickness, high strength, and broad electromagnetic absorption bandwidth, representing a current focus in scientific research. − Carbon-based materials, which are renowned for their low density, excellent stability, and strong dielectric loss, are considered promising candidates for EMWs absorption. Nevertheless, pure carbon-based materials often fall short in achieving excellent EMWs absorption due to impedance mismatch and the skin effect.…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Chestnut-Like Magnetic CNOs@PANI with Microwedge Enhanced Electromagnetic Wave Absorption

Li,

Zhang,

Zhang

et al. 2024

ACS Appl. Electron. Mater.

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In this study, a novel chestnut-like structured magnetic carbon nano-onion (MCNOs)@polyaniline (PANI) core–shell material was synthesized through a one-step in situ oxidation polymerization method under ice-bath conditions. The morphology of the chestnut-like shell was influenced by the type of protonic acid and the polymerization temperature with sulfuric acid at 0–5 °C. The MCNOs@PANI composite material demonstrated improved electromagnetic wave (EMW) absorption performance, with a minimum reflection loss (RL) of −47.82 dB at 14.64 GHz and a maximum electromagnetic wave absorption bandwidth (EAB) of 4.40 GHz at a thickness of 1.5 mm. The superior EMW absorption performance was attributed to the unique chestnut-like surface structure, enhanced core–shell impedance matching, and synergistic effects of the MCNOs and PANI. The study provides a creative approach for advancing the development of carbon-based EMW absorbers with enhanced absorption capabilities.

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Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Chestnut-Like Magnetic CNOs@PANI with Microwedge Enhanced Electromagnetic Wave Absorption

Li,

Zhang,

Zhang

et al. 2024

ACS Appl. Electron. Mater.

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Microporous Cobalt Ferrite with Bio‐Carbon Loosely Decorated to Construct Multi‐Functional Composite for Dye Adsorption, Anti‐Bacteria and Electromagnetic Protection

Ma,

Lan,

Zhang

et al. 2024

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Currently, facing electromagnetic protection requirement under complex aqueous environments, the bacterial reproduction and organic dye corrosion may affect the composition and micro‐structures of absorbers to weaken their electromagnetic properties. To address such problems, herein, a series of CoFe2O4@BCNPs (cobalt ferrite @ bio‐carbon nanoparticles) composites are synthesized via co‐hydrothermal and calcining process. The coupling of magnetic cobalt ferrite and dielectric bio‐carbon derived from Apium can endow the composite multiple absorption mechanisms and matched impedance for effective microwave absorption, attaining a bandwidth of 8.12 GHz at 2.36 mm and an intensity of −49.85 dB at 3.0 mm. Due to the ROS (reactive oxygen species) stimulation ability and heavy metal ions of cobalt ferrite, the composite realizes an excellent antibacterial efficiency of 99% against Gram negative bacteria of Escherichia coli. Moreover, the loose porous layer of surface stacked bio‐carbon can promote the adsorption of methylene blue for subsequent eliminating, a high removal rate of 90.37% for organic dye can be also achieved. This paper offers a new insight for rational design of composite's component and micro‐structure to construct multi‐functional microwave absorber for satisfying the electromagnetic protection demand in complicated environments.

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Biomimetic Multi‐Interface Design of Raspberry‐like Absorbent: Gd‐doped FeNi₃@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation

Hu,

He,

Luo

et al. 2024

Small Methods

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Structural design and interface regulation are useful strategies for achieving strong electromagnetic wave absorption (EMWA) and broad effective absorption bandwidth (EAB). Herein, a monomer‐mediated strategy is employed to control the growth of covalent organic framework (COF) wrapping flower‐shaped Gd‐doped FeNi3 (GFN), and a novel raspberry‐like absorbent based on biomimetic design is fabricated by thermal catalysis. Further, a unique dielectric‐magnetic synergistic system is constructed by utilizing the COF‐derived nitrogen‐doped porous carbon (NPC) as the shell and anisotropic GFN as the core. The electromagnetic parameters of the GFN@NPC composites can be tuned by adjusting the proportions of GFN and NPC. Off‐axis electron holography results further clarify the interface polarization and microscale magnetic interactions affecting the EMW loss mechanism. As a result, the GFN@NPC samples exhibit broad EMWA performance. The EAB values of all GFN@NPC composites reach up to 6.0 GHz, with the GFN@NPC‐2 sample showing a minimum reflection loss (RLmin) of −69.6 dB at 1.68 mm. In addition, GFN@NPC‐2 achieves a maximum radar cross–section (RCS) reduction of 29.75 dB·m2. A multi‐layer gradient structure is also constructed using metamaterial simulation to achieve an ultra‐wide EAB of 12.24 GHz. Overall, this work provides a novel bio‐inspired design strategy to develop high‐performance EMWA materials.

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SiO2–modified APTMS nanocoatings encapsulating FeNi: Amplifying microwave absorption and corrosion resistance

Cited by 9 publications

References 57 publications

One-Step Synthesis of Chestnut-Like Magnetic CNOs@PANI with Microwedge Enhanced Electromagnetic Wave Absorption

One-Step Synthesis of Chestnut-Like Magnetic CNOs@PANI with Microwedge Enhanced Electromagnetic Wave Absorption

Microporous Cobalt Ferrite with Bio‐Carbon Loosely Decorated to Construct Multi‐Functional Composite for Dye Adsorption, Anti‐Bacteria and Electromagnetic Protection

Biomimetic Multi‐Interface Design of Raspberry‐like Absorbent: Gd‐doped FeNi₃@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation

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SiO2–modified APTMS nanocoatings encapsulating FeNi: Amplifying microwave absorption and corrosion resistance

Cited by 9 publications

References 57 publications

One-Step Synthesis of Chestnut-Like Magnetic CNOs@PANI with Microwedge Enhanced Electromagnetic Wave Absorption

One-Step Synthesis of Chestnut-Like Magnetic CNOs@PANI with Microwedge Enhanced Electromagnetic Wave Absorption

Microporous Cobalt Ferrite with Bio‐Carbon Loosely Decorated to Construct Multi‐Functional Composite for Dye Adsorption, Anti‐Bacteria and Electromagnetic Protection

Biomimetic Multi‐Interface Design of Raspberry‐like Absorbent: Gd‐doped FeNi3@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation

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Product

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Biomimetic Multi‐Interface Design of Raspberry‐like Absorbent: Gd‐doped FeNi₃@Covalent Organic Framework Derivatives for Efficient Electromagnetic Attenuation