Defects-Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites with Robust Electromagnetic Wave Absorption DOI Creative Commons
Jiaolong Liu, Siyu Zhang, Dan Qu

et al.

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 17(1)

Published: Sept. 27, 2024

Abstract Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies, as well veiled dielectric-responsive character, are instrumental in electromagnetic dissipation. Conventional methods, however, constrain their delicate constructions. Herein, an innovative alternative is proposed: carrageenan-assistant cations-regulated (CACR) strategy, which induces a series of sulfides nanoparticles rooted situ on the surface carbon matrix. This unique configuration originates from strategic vacancy formation energy strong sulfides-carbon support interaction, benefiting construction defects-rich heterostructures M x S y /carbon composites (M-CAs). Impressively, these generated sulfur vacancies firstly found to strengthen electron accumulation/consumption ability at and, simultaneously, induct local asymmetry electronic structure evoke large dipole moment, ultimately leading polarization coupling, i.e., defect-type interfacial polarization. Such “Janus effect” (Janus effect means versatility, Greek two-headed Janus) intuitively confirmed by both theoretical experimental investigations for first time. Consequently, vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth 6.76 GHz only 1.8 mm, compared vacancies-free CAs without any dielectric response. Harnessing heterostructures, this one-pot CACR strategy may steer design development advanced nanomaterials, boosting functionality across diverse application domains beyond

Language: Английский

Construction of iron manganese metal–organic framework-derived manganese ferrite/carbon-modified graphene composites toward broadband and efficient electromagnetic dissipation DOI

Baohua Liu,

Shuai Liu, Zaigang Luo

et al.

International Journal of Minerals Metallurgy and Materials, Journal Year: 2025, Volume and Issue: 32(3), P. 546 - 555

Published: Feb. 1, 2025

Language: Английский

Citations

4
Intercalation-Induced Interlayer and Defect Engineering in Ti3C2Tx MXene for Ultralow-Reflection Electromagnetic Interference Shielding DOI
Ruosong Li, Youpeng Huangfu, Lulu Liu

et al.

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 7, 2025

Interlayer and defect engineering significantly affects the electrical conductivity electromagnetic interference (EMI) shielding of Ti3C2Tx MXene. Previous studies have prioritized size intercalant over its synergy with chemical affinity, limiting elucidation intercalation mechanism precise control interlayer spacing (d-spacing). Herein, we synthesize MXene aerogels a tunable d-spacing density using series amine molecules different sizes affinities as intercalants cross-linkers. Particularly, p-phenylenediamine (PPD) increases from 0.960 to 1.642 nm. Simultaneously, increased contributes an within Ti–Ti layer. Hence, PPD@MXene aerogel exhibits reduced surface electric field intensity internal polarization loss, resulting in absorption-dominated EMI shielding. The absorptivity reaches 0.92, far exceeding reported materials, effectiveness 50.4 dB. This study provides theoretical foundation preliminary guidance for development interlayer-engineered materials.

Language: Английский

Citations

2
A tunable metamaterial microwave absorber inspired by chameleon’s color-changing mechanism DOI Creative Commons
Dahyun Daniel Lim,

Alberto Ibarra,

Jeong-Woo Lee

et al.

Science Advances, Journal Year: 2025, Volume and Issue: 11(3)

Published: Jan. 15, 2025

A metamaterial absorber capable of swiftly altering its electromagnetic response in the microwave range offers adaptability to changing environments, such as tunable stealth capabilities. Inspired by chameleon’s ability change color through structural transformation photonic lattice crystals, which shift bandgaps reflection and transmission visible light, we designed a crisscross structure that transforms from an expanded collapsed form. This enables switch between broadband absorption peak (4 18 gigahertz). The structure, optimized data-driven design, is mechanically actuated rotation interlinked trusses. mechanism changes entire array’s response, allowing it remain undetected external radar or transmit internal signal near-field receiver when needed. mechanical actuation shifting arrayed are demonstrated.

Language: Английский

Citations

2
Multifunctional Carbon Foam with Nanoscale Chiral Magnetic Heterostructures for Broadband Microwave Absorption in Low Frequency DOI Creative Commons
Hao Zhang,

Kaili Kuang,

Yifeng Zhang

et al.

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: Feb. 6, 2025

Abstract The construction of carbon nanocoil (CNC)-based chiral-dielectric-magnetic trinity composites is considered as a promising approach to achieve excellent low-frequency microwave absorption. However, it still challenging further enhance the low frequency absorption and elucidate related loss mechanisms. Herein, chiral CNCs are first synthesized on three-dimensional (3D) foam then combined with FeNi/NiFe 2 O 4 nanoparticles form novel foam. 3D porous CNC-carbon network provides impedance matching strong conduction loss. formation FeNi-carbon interfaces induces interfacial polarization loss, which confirmed by density functional theory calculations. Further permeability analysis micromagnetic simulation indicate that nanoscale magnetic heterostructures pinning coupling effects, anisotropy capability. Owing synergistic effect between dielectricity, chirality, magnetism, composite exhibits performance an ultrabroad effective bandwidth (EAB) 14 GHz minimum reflection less than − 50 dB. More importantly, C-band EAB extended GHz, achieving full coverage. This study guidelines for microstructure design broadband

Language: Английский

Citations

2
Defects-Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites with Robust Electromagnetic Wave Absorption DOI Creative Commons
Jiaolong Liu, Siyu Zhang, Dan Qu

et al.

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 17(1)

Published: Sept. 27, 2024

Abstract Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies, as well veiled dielectric-responsive character, are instrumental in electromagnetic dissipation. Conventional methods, however, constrain their delicate constructions. Herein, an innovative alternative is proposed: carrageenan-assistant cations-regulated (CACR) strategy, which induces a series of sulfides nanoparticles rooted situ on the surface carbon matrix. This unique configuration originates from strategic vacancy formation energy strong sulfides-carbon support interaction, benefiting construction defects-rich heterostructures M x S y /carbon composites (M-CAs). Impressively, these generated sulfur vacancies firstly found to strengthen electron accumulation/consumption ability at and, simultaneously, induct local asymmetry electronic structure evoke large dipole moment, ultimately leading polarization coupling, i.e., defect-type interfacial polarization. Such “Janus effect” (Janus effect means versatility, Greek two-headed Janus) intuitively confirmed by both theoretical experimental investigations for first time. Consequently, vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth 6.76 GHz only 1.8 mm, compared vacancies-free CAs without any dielectric response. Harnessing heterostructures, this one-pot CACR strategy may steer design development advanced nanomaterials, boosting functionality across diverse application domains beyond

Language: Английский

Citations

15