Showing papers on "Absorption (electromagnetic radiation) published in 2022"
TL;DR: In this paper, a magnetic ferrite CuFe2O4/MoS2 composite was constructed to achieve a wide effective absorption bandwidth (EAB) of 8.16 GHz (9.84 GHz −18 GHz) at 2.3 mm.
127 citations
TL;DR: In this paper, a new and effective strategy was proposed to develop high efficiency microwave absorbers with ultra-lightweight, wide-band, thin thickness and strong absorption capabilities, benefiting from the excellent synergistic effect between RGOF and reduced graphene oxide foam (RGOF)/MoS2.
119 citations
TL;DR: In this article, the authors reviewed the recent progress of the spinel structured MFe2O4, including synthesis methods, microstructures and the effects of different components (such as carbonaceous materials, metallic compounds, conducting polymer, MXene, etc.) on the morphology and microwave absorption performances.
118 citations
TL;DR: In this paper, the effect of Fe doping on the dielectric and magnetic properties of LCFOs and the strong hybridization of Co/Fe-3d with O-2p was successfully demonstrated.
109 citations
TL;DR: In this paper, an ultralight magnetic-carbon hybrid material was designed to achieve superior microwave absorption performance by instantaneous freezing-induced self-assembly of Fe3+, Co2+glucose complexes on a cheap and water-removable template (i.e., NaCl).
94 citations
TL;DR: In this article, the effect of N-doped carbon skeletons on the absorption ability of carbon-based absorbers has been investigated, and the authors provided a valuable approach for fabricating high-efficiency microwave absorption materials by combining the control of morphology and Ndoped effect on the absorbers.
88 citations
TL;DR: In this paper, NiFe2O4/polypyrrole nanocomposites are prepared by a simple surface-initiated polymerization method and demonstrate negative permittivity in the low frequency regions.
86 citations
TL;DR: In this article, a 3D hierarchical Co/carbon nanosheets (CNS)/rGO magnetic-dielectric composite with controllable composition and microstructure as a high-efficiency absorber by using a three-step route.
81 citations
TL;DR: In this article, a review of 2D nanomaterials with high specific area, low density and special electric behavior have attracted tremendous interest in the field of electromagnetic wave (EMW) absorption, including graphene, MXenes, MoS2 nanosheets, layered double hydroxides (LDHs), graphite-like C3N4 (g-C3N 4), and other representative transition metal dichalcogenides (TMDs).
80 citations
TL;DR: In this article, a series of manganese oxides/porous carbon (MnxOy@C) hybrid composites are obtained by a two-step process, and the authors demonstrated that the addition of porous carbon is vital for enhancing EMA performance of composites, which not only coordinates impedance matching allowing more EM waves enter the absorber, but also provides the path for electron movement.
77 citations
TL;DR: In this article, MgFe2O4/MgO/C fibers were successfully prepared via electrospinning technology and carbonization, and their surfaces were coated by MoS2 via hydrothermal method.
TL;DR: In this paper, the pyrolysis laws of Co-based Prussian blue analogue (PBA) with the mechanisms of carbon nanotubes synthesis catalyzed by Co nanoparticles, and prepared CNTs-linked cubic porous PBA derivative (CoCN@CNT) through a designed pyrotechnic process.
TL;DR: In this article, a strategy for the development of composites as promising electromagnetic wave absorbent was presented, which showed that the conduction loss and polarization loss caused by the carbon nanotubes with different lengths and densities and the porosity of the composites are together responsible for the attenuation of electromagnetic wave.
TL;DR: In this paper, the molar ratios of Fe3+ to Zn2+ had notable effects on the electromagnetic parameters and microwave attenuation capacity of attained composites, i.e., the obtained composites had the optimal electromagnetic attenuation performance, and the minimum reflection loss achieved −79.0dB with a matching thickness of 2.76mm and effective absorption bandwidth was as high as 5.8GHz under a thin thickness of 1.8mm and low filling ratio of 20.0
Abstract: Developing strong absorption and broadband microwave absorbers derived from metal-organic frameworks (MOFs) still remains a big challenge in the field of microwave absorption. Herein, iron zinc bimetallic metal-organic frameworks/reduced graphene oxide (FeZn-MOFs/RGO) precursors derived ferroferric oxide/carbon (Fe3O4/C) decorated graphene composites were fabricated via a solvothermal and carbonization two-step strategy. It was found that the morphology of carbon frameworks could be regulated from the traditional regular octahedron to the pomegranate shape by simply adjusting the molar ratios of Fe3+ to Zn2+ in the precursors. Moreover, results revealed that the molar ratios of Fe3+ to Zn2+ had notable effects on the electromagnetic parameters and microwave attenuation capacity of attained composites. Significantly, the obtained composites with the molar ratio of Fe3+ to Zn2+ of 1:2 presented the optimal electromagnetic attenuation performance, i.e. the minimum reflection loss achieved −79.0 dB with a matching thickness of 2.76 mm and effective absorption bandwidth was as high as 5.8 GHz under a thin thickness of 1.8 mm and low filling ratio of 20.0 wt%. Additionally, the potential microwave dissipation mechanisms were illuminated. Therefore, our results would shed light on the development of high-efficiency and broadband microwave absorbing composites derived MOFs.
TL;DR: In this paper, a series of metal/nitrogen co-doped hollow carbon nanorods (M-NHCRs, M represent as Fe, Co, Ni) were successfully fabricated via a facile self-assembly template strategy, which refers to selfassembling of 9,10-dibromoanthracene (DBA), surficial modification with polydopamine (PDA) and metal ions, and controlled pyrolysis.
Abstract: Converting carbonaceous material into heteroatom-doped hollow nanomaterial is a promise route to realize lightweight and high-performance electromagnetic wave absorption (EMA). In this work, a series of metal/nitrogen co-doped hollow carbon nanorods (M-NHCRs, M represent as Fe, Co, Ni) were successfully fabricated via a facile self-assembly template strategy, which refers to self-assembling of 9,10-dibromoanthracene (DBA), surficial modification with polydopamine (PDA) and metal ions, and controlled pyrolysis. Among these M-NHCRs, Co-NHCR exhibits remarkable EMA performance, where the optimal reflection loss (RL) reaches −58.6 dB at a loading ratio of 5 wt%. Moreover, the effective absorption bandwidth (EAB) gets to 7.65 GHz. It is considered that the high-performance EMA should be attributed to the unique hollow structure, excellent conductance loss and improved polarization relaxation. This research not only provides a new idea for the design of lightweight electromagnetic absorbents with broadband efficient absorption, but also broadens the way of synthesizing hollow nanomaterials.
TL;DR: In this article, a novel Co @ mesoporous C/macroporous C sheet hybrid was successfully prepared by in-situ self-assembly of ZnCo MOF nanosheet arrays on biomass-derived porous carbon sheets via hydrothermal and pyrolysis methods.
TL;DR: In this paper, a metal-mesh-supported polymer composite consisting of a reflection layer and an absorbing layer was proposed for 5G EMI shielding applications, which has a SER of only 2dB and a SEA of 46dB.
TL;DR: In this article, a high-density 2D Ni2P nanosheets were grown vertically and cross-linked on the surface of 1D silk-derived carbon fiber.
TL;DR: In this paper, silver micro-tubes with superstructure, which were fabricated via using poly(lactic acid) (PLA) fibers as templates, were used to achieve the composites with ultrahigh, lightweight, and absorption-dominant electromagnetic shielding performance.
TL;DR: In this paper, the minimum reflection loss (RLmin) of bark-derived Co-doped porous carbon composites (Co@PC) for microwave absorption (MA) applications were successfully prepared through a simple method.
TL;DR: In this article, yolk-shelled Co@SiO2@Mesoporous carbon microspheres were prepared by in-situ one-pot synthesis, carbonization reduction, and subsequent etching.
TL;DR: In this paper, a composite of biomass-derived carbon (BC) with magnetic alloy has been used as a low-cost, lightweight, and high-performance microwave absorber with a minimum reflection loss of −54.4 dB with a thickness of 2.2mm.
TL;DR: In this paper, a solvent-free method to synthesize Co-MOF and its derivatives was proposed, which bridged the cobalt (II) ion of CoSnO3 and the 2-methylimidazole skeleton.
TL;DR: In this paper, a review of the recent advancements in the photocatalytic activity, selectivity, and stability of Cu-based catalysts are discussed systematically, and the future research directions are discussed based on the available relevant literature.
TL;DR: In this article, a chiral small molecule soft-template was proposed for the synthesis of superhelical chiral polypyrrole nanofibers, which can be developed as a promising high-performance anticorrosive microwave absorber.
TL;DR: In this article, a series of multi-element core-shell magnetic nano-particle composite layered graphene absorbing materials CoFe2O4@C/rGO (CCr) were prepared by adjusting carbon shell thickness.
TL;DR: In this paper, a tunable structure of cobalt hexacyanoferrate submicrocubes (CoHCF) is fabricated via cation exchange method, and the results show that the morphology and structure are important for enhancing the microwave absorption properties.
TL;DR: In this article, ultrasonic spray technology is utilized for build up MXene and MoS2 nanosheets to three-dimensional MXene/MoS2 fold microspheres by one-step method.
TL;DR: In this paper, a core-shell structural carbon microsphere/magnetic metal composites were fabricated through the combination of an electrostatic assembly approach and subsequent in-situ reduction reaction.
TL;DR: In this article, a hierarchical multi-shell Fe@C@TiO2@MoS2 (FCTM) microsphere is fabricated via an in-situ reduction process.