Shell engineering afforded dielectric polarization prevails and impedance amelioration toward electromagnetic wave absorption enhancement in nested‐network carbon architecture

Chemical Engineering Journal, Год журнала: 2024, Номер 501, С. 157556 - 157556

Опубликована: Ноя. 16, 2024

Язык: Английский

---

Multiple Schottky Contacts Motivated via Defects to Tune the Response Ability of Electromagnetic Waves

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 5, 2025

Abstract Metal‐organic framework (MOF) derivatives employed as novel microwave‐absorbing materials (MAMs) have garnered significant attention due to their diverse in situ or ex coordinated components and the flexibility nano‐microstructure fabrication. A well‐designed heterointerface can provide an optimal balance between impedance high‐loss capability. However, precisely tuning semiconductor‐metal‐carbon heterostructures remains a huge challenge. Herein, multi‐component NiS/Co 3 S 4 /NiCo@CNTs/NC nanohybrid with hollow structure is elaborately fabricated using convenient solvothermal method followed by high‐temperature pyrolysis, forming unique heterostructure multiple Schottky contacts. This demonstrates remarkable reflection loss value of −75.9 dB at thickness 2.6 mm. The transcendent microwave absorption (MA) capacity primarily attributed intense polarization relaxation process superb impedance‐matching properties semiconductor/metal/carbon hybrid barriers. In addition, built‐in electric field established heterointerfaces increases electron transport capabilities. Notably, controllable introduction numerous defects into carbon layer intensifies interfacial effect nanohybrid. study offers innovative insights mechanisms development high‐performance MAMs.

Язык: Английский

---

Dimensional Design of Cellulose Aerogels with Schottky Contact for Efficient Microwave Absorption

Small, Год журнала: 2025, Номер unknown

Опубликована: Фев. 5, 2025

Cellulose aerogels, as a novel class of carbon-based materials, exhibit immense potential in the field microwave absorption (MWA) due to their biocompatibility, low density, unique porous structure, and tunable architecture. However, development multi-dimensional components with specialized heterogeneous structures, which are based on cellulose remains significant challenge. This 0D/1D/3D structural configuration facilitates electromagnetic properties favorable impedance matching. The Schottky contact at ZnO/Ni interface, particular, induces strong interfacial polarization, design results multiple heterointerfaces. Density functional theory (DFT) calculations reveal that barrier causes band bending, facilitating directed migration electrons interface formation an internal electric field, thus significantly accelerating multipolar relaxation process. As anticipated, CCMC/ZnO@Ni aerogel exhibits minimum reflection loss (RLmin) value -64.0 dB 13.9 GHz thickness 2.0 mm, its effective bandwidth (EAB) reaches 4.9 GHz. work gives valuable guidance inspiration for materials composed dimensional gradient holds great application wave (EMW) attenuation.

Язык: Английский

---

Two-phase magnetic nanospheres with magnetic coupling effect encapsulated in porous carbon to achieve lightweight and efficient microwave absorbers

Journal of Colloid and Interface Science, Год журнала: 2024, Номер 671, С. 56 - 66

Опубликована: Май 22, 2024

Язык: Английский

---

Anion Doping as a “Trigger” to Modulate Defect‐Tailored Dielectric Coupling for Ultrathin Microwave Absorber

Small, Год журнала: 2024, Номер unknown

Опубликована: Дек. 1, 2024

Abstract Anion doping engineering is recognized as a prospective strategy to adjust the electronic configuration and transport capacity of carbon‐based magnetoelectric hybrids optimize defects for modulation electromagnetic (EM) properties. This study effectively accomplishes an overwhelming enhancement in dielectric coupling between conduction polarization CuCo bimetallic/carbon system by employing situ (N, O)/ex (S, Se) defect strategies. The well‐designed lattice distortions are facilitated large atomic radii (Se) intercalated carbon skeleton bimetallic CuCo, which activate reinforcement dipole high‐frequency region. Interestingly, appropriate number vacancies acts “electron traps” accelerate local charge redistribution, endowing with extremely strong interactions interface‐induced polarization. It remarkable that ultra‐thin feature (1.8 mm) able achieve extraordinary microwave attenuation (‒56.1 dB). Additionally, specific upgrading anionic Se beneficially hinders development phonon transmission, conferring Cu 2 Se/CoSe /NC‐Se aerogel outstanding infrared stealth capabilities along inheriting advantages traditional (lightness, compressive/structural stability, hydrophobicity/anti‐corrosive properties). research offers distinctive perspectives on advanced design multifunctional absorbers complex environments.

Язык: Английский

---

Design and performance of 3D-Printed ABS@rGO/CF/CeO2 composites for microwave absorption and mechanical strength

Chemical Engineering Journal, Год журнала: 2024, Номер 499, С. 156696 - 156696

Опубликована: Окт. 13, 2024

Язык: Английский

---

In Situ Growth of CoNi Alloy/N-Doped Hollow Carbon Foam for Electromagnetic Wave Absorption

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(16), С. 19427 - 19438

Опубликована: Июль 31, 2024

To meet the demands for high-performance and cost-effective electromagnetic wave absorbers in practical applications, CoNi alloy/N-doped hollow carbon foam (CoNi/NCF) was synthesized using melamine as a precursor through hydrothermal reaction. By introduction of appropriate alloys to form uniform magnetic metal nanoparticles on surface NCF, absorption performance NCF can be adjusted. These formed rich heterogeneous interfaces with enhancing interface polarization loss composite material waves. The alloy increased conductivity materials, which conducive formation three-dimensional conductive network promoted conduction As metal, also brought losses increasing ways consume Additionally, doping N atoms dipole NCF. minimum reflection (RLmin) CoNi/NCF reached −47.35 dB, maximum effective bandwidth (EAB) 5.6 GHz (2.4 mm). effectively reduced radar cross-section (RCS) signal electric conductor layer. This study provides feasible strategy developing materials an efficient performance.

Язык: Английский

---

Self-Assembled Heterojunction Interfaces between g-C₃N₄ and rGO Nanosheets for Enhanced Electromagnetic Wave Absorption

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(16), С. 19688 - 19697

Опубликована: Авг. 8, 2024

Graphene has been widely used in the field of electromagnetic wave (EMW) absorption because it many excellent properties, such as electrical conductivity, large specific surface area, and good mechanical properties. However, high conductivity single loss mechanism lead to poor impedance matching microwave performance. Herein, we developed a strategy introduce g-C3N4 nanosheet combine with graphene oxide (GO) enhance heterojunction interfaces, thus bringing abundant interfacial polarization loss. Moreover, excessive electrons on GO can be transferred through electrostatic interaction between layers. And this basis, designed g-C3N4-rGO into an aerogel structure endow material plentiful porous structure, which promotes reflection scattering waves. In addition, parameters are adjusted by controlling weight ratio GO, well calcination temperatures, obtain both absorbing As result, synthesized shows remarkable EMW performance broad effective bandwidth (EAB) 8.08 GHz (RL) −38.08 dB. To sum up, work provides inspiration guidance for designing nanomaterials outstanding

Язык: Английский

---

One-Pot Hydrothermal Synthesis of SrFe₁₂O₁₉ Nanoplate/Multi-Walled Carbon Nanotube Powders for Microwave Energy Consumption

ACS Applied Nano Materials, Год журнала: 2025, Номер 8(4), С. 1738 - 1748

Опубликована: Янв. 17, 2025

The synthesis of SrFe12O19/MWCNT microwave absorbent nanocomposites was achieved by using a one-pot hydrothermal method, resulting in compounds strontium ferrite nanoplates and multiwalled carbon nanotube (MWCNT). When the mass ratio to MWCNTs is 6:1, SrFe12O19/MWCNTs nanopowder represented most significant reflective loss −33.2 dB at 14.11 GHz while material thickness 1.48 mm. More importantly, reaches an efficacious absorbing bandwidth about 3.96 with 1.35 mm, which could lead relatively low mass, thus demonstrating its potential for utilization as lightweight highly efficient wave-absorbing coating. findings offer valuable reference point subsequent materials.

Язык: Английский

---

Conjugated Microporous Polymer-Derived Nitrogen-Doped Carbon Nanocomposites with Multiple Magnetic Components for Broadband Microwave Absorption

ACS Applied Nano Materials, Год журнала: 2024, Номер 7(22), С. 25970 - 25982

Опубликована: Ноя. 12, 2024

Lightweight magnetic-carbon nanocomposites with multiple magnetic components are highly desirable for their efficacy in broadband microwave absorption. However, fabricating such composites rationally designed chemical composites, tailored microstructure, and uniformly distributed remains a grand challenge using conventional carbon precursors. Herein, we report the facile fabrication of porous N-doped (Fe3O4@FeCN) Fe/Fe3C/Fe3O4 nanoparticles conjugated microporous polymers (CMPs) as precursor. CMPs have high specific surface area abundant nanoporosity, facilitating efficient loading iron ions uniform growth inside matrix. Notably, Fe3O4@FeCN-2 demonstrates excellent absorption capabilities minimum reflection loss (RLmin) −49.68 dB wide bandwidth 5.72 GHz at matching thickness only 2.0 mm. This outstanding performance is primarily attributed to synergistic effects significantly improved impedance matching, enhanced polarization loss, introduction through embedded nanoporous Moreover, simulation computer technology (CST), shows reduced radar cross section (RCS), RCS values <−10 covering entire frequency band 2–18 angles 30, 60, 90°, demonstrating its great potential applications systems stealth technology. work will inspire development precursors fabricate lightweight precisely controlled structures high-performance

Язык: Английский

---