Rational construction of hierarchical Co@C@NPC nanocomposites derived from bimetallic hybrid ZIFs/biomass for boosting the microwave absorption

Wang, Yan; Di, Xiaochuang; Lu, Zhao; Wu, Xinming

doi:10.1016/j.jcis.2021.01.013

Cited by 117 publications

(26 citation statements)

References 52 publications

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“…When the thickness of the material is increasing, the frequency corresponding to minimum R L becomes smaller. This regularity is in line with the ¼ wave length model as follows [60][61][62]:…”

Section: Emw Absorption Mechanismsupporting

confidence: 82%

MoS2-Decorated/Integrated Carbon Fiber: Phase Engineering Well-Regulated Microwave Absorber

et al. 2021

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Phase engineering is an important strategy to modulate the electronic structure of molybdenum disulfide (MoS2). MoS2-based composites are usually used for the electromagnetic wave (EMW) absorber, but the effect of different phases on the EMW absorbing performance, such as 1T and 2H phase, is still not studied. In this work, micro-1T/2H MoS2 is achieved via a facile one-step hydrothermal route, in which the 1T phase is induced by the intercalation of guest molecules and ions. The EMW absorption mechanism of single MoS2 is revealed by presenting a comparative study between 1T/2H MoS2 and 2H MoS2. As a result, 1T/2H MoS2 with the matrix loading of 15% exhibits excellent microwave absorption property than 2H MoS2. Furthermore, taking the advantage of 1T/2H MoS2, a flexible EMW absorbers that ultrathin 1T/2H MoS2 grown on the carbon fiber also performs outstanding performance only with the matrix loading of 5%. This work offers necessary reference to improve microwave absorption performance by phase engineering and design a new type of flexible electromagnetic wave absorption material to apply for the portable microwave absorption electronic devices.

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Section: Emw Absorption Mechanismsupporting

confidence: 82%

MoS2-Decorated/Integrated Carbon Fiber: Phase Engineering Well-Regulated Microwave Absorber

et al. 2021

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“…While promising, current biomass-derived carbon materials cannot exhibit a wideband EM absorption at a thin thickness (< 2.0 mm) due to their limited EM loss capability [43]. As an alternative strategy, carbon material-based composites consisting of biomass-derived carbon materials and other components, such as magnetic metals, transitional metal oxides, etc., have attracted growing attention, aiming to enhance and incorporate other loss abilities [44][45][46]. Although the carbon material-based composite approach shows some promise, the numerous intrinsic merits of single-component carbon material-based EM absorbers, such as ultralow density and good chemical stability, are lost.…”

Section: Introductionmentioning

confidence: 99%

Biomass-Derived Carbon Heterostructures Enable Environmentally Adaptive Wideband Electromagnetic Wave Absorbers

et al. 2021

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Although advances in wireless technologies such as miniature and wearable electronics have improved the quality of our lives, the ubiquitous use of electronics comes at the expense of increased exposure to electromagnetic (EM) radiation. Up to date, extensive efforts have been made to develop high-performance EM absorbers based on synthetic materials. However, the design of an EM absorber with both exceptional EM dissipation ability and good environmental adaptability remains a substantial challenge. Here, we report the design of a class of carbon heterostructures via hierarchical assembly of graphitized lignocellulose derived from bamboo. Specifically, the assemblies of nanofibers and nanosheets behave as a nanometer-sized antenna, which results in an enhancement of the conductive loss. In addition, we show that the composition of cellulose and lignin in the precursor significantly influences the shape of the assembly and the formation of covalent bonds, which affect the dielectric response-ability and the surface hydrophobicity (the apparent contact angle of water can reach 135°). Finally, we demonstrate that the obtained carbon heterostructure maintains its wideband EM absorption with an effective absorption frequency ranging from 12.5 to 16.7 GHz under conditions that simulate the real-world environment, including exposure to rainwater with slightly acidic/alkaline pH values. Overall, the advances reported in this work provide new design principles for the synthesis of high-performance EM absorbers that can find practical applications in real-world environments.

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“…The Co, Fe, and C elements in the surface of MF composites are verified by the XPS survey spectrum (Figure c). The C 1s spectrum (Figure d) showed three deconvoluted peaks at 284.8, 286.2, and 289.1 eV, assigned to OCC, C–C, and CO, respectively . For the high-resolution Co 2p XPS spectrum, two fitting peaks located at 780.7 and 796.0 eV are consistent with Co 2p 3/2 and Co 2p 1/2 of the Co(II) state, respectively (Figure e). , Furthermore, other binding energies of 785.1 and 803.3 eV were assigned to the satellite peaks.…”

Section: Results and Discussionmentioning

confidence: 82%

Enhanced Microwave Absorbing Ability of Carbon Fibers with Embedded FeCo/CoFe₂O₄ Nanoparticles

Chen

Zheng

Huang

et al. 2021

ACS Appl. Mater. Interfaces

121

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In the face of increasingly severe electromagnetic (EM) wave pollution, the research of EM wave absorbing materials is an effective solution. To reduce the density of traditional absorbing materials, in this work, FeCo/CoFe2O4/carbon nanofiber composites were successfully prepared by electrospinning for the EM wave attenuation application. Benefiting from the loss ability of interface polarization, dipole polarization, and magnetic loss, the composites obtained a bandwidth of 5.0 GHz at a 1.95 mm thickness and an absorption peak of −52.3 dB. More importantly, the radar cross section (RCS) reduction of composite coatings calculated by ANSYS Electronics Desktop 2018 (HFSS) can reach 34.5 dBm2, and the RCS value is almost less than −10 dBm2 when the incident angle is greater than 20°, demonstrating great scattering ability of the material coating to EM waves. This work, combined with the exploration of the mechanism and the simulation analysis of the absorbing coating, will be of significance for the development of absorbing materials.

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Rational construction of hierarchical Co@C@NPC nanocomposites derived from bimetallic hybrid ZIFs/biomass for boosting the microwave absorption

Cited by 117 publications

References 52 publications

MoS2-Decorated/Integrated Carbon Fiber: Phase Engineering Well-Regulated Microwave Absorber

MoS2-Decorated/Integrated Carbon Fiber: Phase Engineering Well-Regulated Microwave Absorber

Biomass-Derived Carbon Heterostructures Enable Environmentally Adaptive Wideband Electromagnetic Wave Absorbers

Enhanced Microwave Absorbing Ability of Carbon Fibers with Embedded FeCo/CoFe₂O₄ Nanoparticles

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Rational construction of hierarchical Co@C@NPC nanocomposites derived from bimetallic hybrid ZIFs/biomass for boosting the microwave absorption

Cited by 117 publications

References 52 publications

MoS2-Decorated/Integrated Carbon Fiber: Phase Engineering Well-Regulated Microwave Absorber

MoS2-Decorated/Integrated Carbon Fiber: Phase Engineering Well-Regulated Microwave Absorber

Biomass-Derived Carbon Heterostructures Enable Environmentally Adaptive Wideband Electromagnetic Wave Absorbers

Enhanced Microwave Absorbing Ability of Carbon Fibers with Embedded FeCo/CoFe2O4 Nanoparticles

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Enhanced Microwave Absorbing Ability of Carbon Fibers with Embedded FeCo/CoFe₂O₄ Nanoparticles