Liquid‐Metal‐Assisted Programmed Galvanic Engineering of Core–shell Nanohybrids for Microwave Absorption

Advanced Functional Materials, Год журнала: 2023, Номер 33(34)

Опубликована: Май 17, 2023

Abstract Core–shell nanostructures have received widespread attention because of their potential usage in various technological and scientific fields. However, they still face significant challenges terms fabrication core–shell nanostructure libraries on a controlled, even programmed scale. This study proposes general approach to systematically fabricate nanohybrids using liquid‐metal Ga alloys as reconfigurable templates, the initiation local galvanic replacement reaction is demonstrated utilizing an ultrasonic system. Under agitation, hydrated gallium oxides generated liquid metal droplets, simultaneously delaminated themselves from interfaces. Subsequently, single‐metal or bimetallic components are deposited fresh smooth Ga‐based via reactions form unique metal/metal nanohybrids. Controlled quantitative regulation diversity non‐homogeneous nanoparticle shell layer composition achieved. The obtained used efficient microwave absorbers dissipate unwanted electromagnetic wave pollution. effective absorption bands (90% absorption) GaNi GaCoNi 3.92 3.8 GHz at thickness 1.4 mm, respectively. advanced strategy enables growth other sulfides by spontaneous interfacial redox for functional materials future.

Язык: Английский

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Recent advances of carbon-based electromagnetic wave absorption materials facing the actual situations

Carbon, Год журнала: 2023, Номер 208, С. 390 - 409

Опубликована: Апрель 5, 2023

Язык: Английский

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Metal–Organic Gel Leading to Customized Magnetic-Coupling Engineering in Carbon Aerogels for Excellent Radar Stealth and Thermal Insulation Performances

Nano-Micro Letters, Год журнала: 2023, Номер 16(1)

Опубликована: Дек. 4, 2023

Metal-organic gel (MOG) derived composites are promising multi-functional materials due to their alterable composition, identifiable chemical homogeneity, tunable shape, and porous structure. Herein, stable metal-organic hydrogels prepared by regulating the complexation effect, solution polarity curing speed. Meanwhile, collagen peptide is used facilitate fabrication of a aerogel with excellent physical properties as well homogeneous dispersion magnetic particles during calcination. Subsequently, two kinds heterometallic coupling systems obtained through application Kirkendall effect. FeCo/nitrogen-doped carbon (NC) demonstrates an ultra-strong microwave absorption - 85 dB at ultra-low loading 5%. After reducing time taken atom shifting, FeCo/Fe

Язык: Английский

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Recent progress in carbon-based materials and loss mechanisms for electromagnetic wave absorption

Carbon, Год журнала: 2024, Номер 219, С. 118834 - 118834

Опубликована: Янв. 18, 2024

Язык: Английский

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Perspectives of nitrogen-doped carbons for electromagnetic wave absorption

Carbon, Год журнала: 2024, Номер 221, С. 118925 - 118925

Опубликована: Фев. 10, 2024

Язык: Английский

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Regulation of Impedance Matching and Dielectric Loss Properties of N‐Doped Carbon Hollow Nanospheres Modified With Atomically Dispersed Cobalt Sites for Microwave Energy Attenuation

Small, Год журнала: 2023, Номер 19(28)

Опубликована: Март 28, 2023

The rational design of lightweight, broad-band, and high-performance microwave absorbers is urgently required for addressing electromagnetic pollution issue. Metal single atoms (M-SAs) receive considerable interest in the field absorption due to unique electronic structures M-SAs. However, simultaneous engineering morphology structure M-SAs based remains challenging. Herein, a template-assisted method utilized fabricate isolated Co-SAs on N-doped hollow carbon spheres (NHCS@Co-SAs) absorption. combination atomically dispersed Co sites supports endows NHCS@Co-SAs with excellent properties. Typically, at an ultralow filler content 8 wt%, minimum reflection loss effective bandwidth are up -44.96 dB 5.25 GHz, respectively, while absorbing thickness only 2 mm. Theoretical calculations experimental results indicate that impedance matching characteristic dielectric NHCSs can be tuned via introduction M-SAs, which responsible properties NHCS@Co-SAs. This work provides atomic-level insight into relationship between states their developing advanced absorbers.

Язык: Английский

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Heterostructure design of hydrangea-like Co2P/Ni2P@C multilayered hollow microspheres for high-efficiency microwave absorption

Journal of Material Science and Technology, Год журнала: 2023, Номер 181, С. 104 - 114

Опубликована: Окт. 30, 2023

Язык: Английский

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Metal organic frameworks derived NixSey@NC hollow microspheres with modifiable composition and broadband microwave attenuation

Carbon, Год журнала: 2024, Номер 226, С. 119215 - 119215

Опубликована: Май 4, 2024

Язык: Английский

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Metal–Organic Framework‐Manipulated Dielectric Genes Inside Silicon Carbonitride toward Tunable Electromagnetic Wave Absorption

Small, Год журнала: 2023, Номер 19(46)

Опубликована: Июль 16, 2023

Abstract Heterointerface engineering for different identifiable length scales has emerged as a key research area obtaining materials capable of high‐performance electromagnetic wave absorption; however, achieving controllable architectural and compositional complexity in nanomaterials with environmental thermal stabilities remains challenging. Herein, metal‐containing silicon carbonitride (SiCN/M) nanocomposite ceramics multiphase heterointerfaces were situ synthesized via coordination crosslinking, catalytic graphitization, phase separation processes using trace amounts metal–organic frameworks (MOFs). The results reveal that the regulation dielectric genes by MOFs can yield considerable lattice strain abundant defects, contributing to strong interfacial dipole polarizations. as‐prepared SiCN/M demonstrate excellent microwave absorption performance: minimum reflection loss (RL min ) is −72.6 dB at thickness only 1.5 mm −54.1 an ultralow frequency 3.56 GHz SiCN/Fe RL −55.1 broad bandwidth 3.4 1.2 SiCN/CoFe ceramic. are expected provide guidance design future based on heterointerface while offering paradigm developing MOF‐modified SiCN desirable properties.

Язык: Английский

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S-NiSe/HG Nanocomposites with Balanced Dielectric Loss Encapsulated in Room-Temperature Self-Healing Polyurethane for Microwave Absorption and Corrosion Protection

ACS Nano, Год журнала: 2024, Номер 18(11), С. 8411 - 8422

Опубликована: Март 4, 2024

Exploring anticorrosion electromagnetic wave (EMW) absorbing materials in harsh conditions remains a challenge. Herein, S-NiSe/HG nanocomposites encapsulated room-temperature self-healing polyurethane (S-NiSe/HG/SPU) were exploited as superior EMW materials. A dual-defect engineering collaborative Schottky interface construction endows with high vacancy concentration, abundant defects, and moderate conductivity. These structural merits synergistically balance dielectric loss by enhancing dipole-interface polarization optimizing conduction loss. As result, demonstrates the optimal absorption performance minimum reflection (RLmin) of −54.8 dB an adequate bandwidth (EAB) 7.1 GHz. Besides, S-NiSe/HG/SPU combines maze effect active repair capability SPU, thereby providing long-term corrosion resistance for Mg alloy. Even under 10 days, affords low current density (1.3 × 10–5 A) charge transfer (3796 Ω cm2). Overall, this work provides valuable insights in-depth exploration development multifunctional EMW-absorbing

Язык: Английский

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