Nitrogen-doped Co-C/MWCNTs nanocomposites derived from bimetallic metal–organic frameworks for electromagnetic wave absorption in the X-band

Shu, Ruiwen; Li, Weijie; Wu, Yue; Zhang, Jiabin; Zhang, Gengyuan

doi:10.1016/j.cej.2019.01.090

Cited by 384 publications

(106 citation statements)

References 54 publications

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“…The intensity ratio of I D /I G in the quaternary hybrid is 1.58, which is higher than that of raw MWCNTs, indicating a decrease of in-plane sp2 domains’ size and the increase of unrepaired defects with an enhanced degree of disorder [37]. These defects can be served as polarization centers to initiate dipole polarization and related relaxation, which are advantageous to the enhancement of microwave absorption performance of the as-prepared hybrid [38,39]. Moreover, the peaks of Raman shift at around 472 cm −1 , 602 cm −1 and 677 cm −1 correspond to the T 2g , A 1g and E g modes of ferrites [36,40].…”

Section: Resultsmentioning

confidence: 99%

Two-Step Solvothermal Synthesis of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs Hybrid with Enhanced Low Frequency Microwave Absorbing Performance

Yin

Zhang

et al. 2019

Nanomaterials

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In this study, the quaternary hybrid of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs with high-performance in low frequency electromagnetic absorption was synthesized via a facile two-step solvothermal synthesis method. The physicochemical properties as well as electromagnetic parameters and microwave absorption performance were characterized by XRD, SEM, TEM, RS, TGA, and VNA, respectively. The results indicate a nuclear-shell morphology of this hybrid for amorphous carbon coated on the surface of Zn0.5Co0.5Fe2O4 and Mn0.5Ni0.5Fe2O4 mixed polycrystalline ferrites. In addition, the MWCNTs synchronously enwind in the nuclear-shell NPs to form a special cross-linking structure. The outstanding low frequency microwave absorption property is attributed to the synergistic effect of dielectric and magnetic loss, better impedance matching condition, and excellent attenuation characteristics of the as-prepared paramagnetic quaternary hybrid. Maximum RL of −35.14 dB at 0.56 GHz with an effective absorption bandwidth in the range of 0.27–1.01 GHz can be obtained with thickness of 5 mm. This hybrid exhibits superior low frequency microwave absorption properties compared with other ferrite-carbon nanocomposites. This investigation provides a new route to prepare suitable candidates for the absorption of electromagnetic waves in a low frequency band on account of its good performance and simple preparation process.

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Section: Resultsmentioning

confidence: 99%

Two-Step Solvothermal Synthesis of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs Hybrid with Enhanced Low Frequency Microwave Absorbing Performance

Yin

Zhang

et al. 2019

Nanomaterials

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“…Recently, metal-organic-frameworks (MOFs) derived porous carbon with ultrahigh surface area, easy operation, low cost and lightweight has been emerged as attractive candidate for EMW absorption. [59][60][61] Lv fabricated the porous Co/C nanocomposites successfully through calculation of Co-based MOFs (ZIF-67) under different temperatures (Co/C-500, Co/C-600, Co/C-800, respectively). [29] In this work, the Co nanoparticles with different sizes were observed to encapsulate into the carbon matrix uniformly (6 nm for Co/C-500, 10 nm for Co/C-600, 20 nm for Co/C-800, Fig.…”

Section: Co/porous Carbon Nanocompositesmentioning

confidence: 99%

Recent Development in Fabrication of Co Nanostructures and Their Carbon Nanocomposites for Electromagnetic Wave Absorption

Wu¹,

Du²,

Hu³

et al. 2020

Eng. Sci.

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In recent years, Electromagnetic wave (EMW) absorption materials have received great interests owing to their ability of addressing the increased EM radiation (EMR) and interference (EMI) problems. With the advantages of high magnification saturation and large permeability in GHz range, cobalt materials have been considered as promising EM absorbers. This article introduces the development of pure Co materials with different micro-structures and Co/C composites as EM wave absorption materials. The effects of various microstructures, filling ratios, and graphitization degree on the EM wave absorption properties were thoroughly discussed. Through comparisons of different types of Co based absorbers, the combination of Co and porous carbon can be an effective method and main direction to reach the requirements of ideal EMW absorption materials with strong absorption, low thickness, broad absorption bandwidth and low density.

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“…To tackle these obstacles, two typical strategies have been commonly employed to shape MA properties. One is to decorate magnetic component with carbon materials to develop magnetic-dielectric system and thereby boost the MA performance by enhancing dielectric loss and improving impedance matching [22][23][24][25][26][27][28][29][30][31]. For example, Cao et al designed Fe@NCNTs composite and showed MA performance of − 30.43 dB [32].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Magnetic Network Constructed by CoFe Nanoparticles Suspended Within “Tubes on Rods” Matrix Toward Enhanced Microwave Absorption

Wang

et al. 2021

Nano-Micro Lett.

129

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Hierarchical magnetic-dielectric composites are promising functional materials with prospective applications in microwave absorption (MA) field. Herein, a three-dimension hierarchical “nanotubes on microrods,” core–shell magnetic metal–carbon composite is rationally constructed for the first time via a fast metal–organic frameworks-based ligand exchange strategy followed by a carbonization treatment with melamine. Abundant magnetic CoFe nanoparticles are embedded within one-dimensional graphitized carbon/carbon nanotubes supported on micro-scale Mo2N rod (Mo2N@CoFe@C/CNT), constructing a special multi-dimension hierarchical MA material. Ligand exchange reaction is found to determine the formation of hierarchical magnetic-dielectric composite, which is assembled by dielectric Mo2N as core and spatially dispersed CoFe nanoparticles within C/CNTs as shell. Mo2N@CoFe@C/CNT composites exhibit superior MA performance with maximum reflection loss of − 53.5 dB at 2 mm thickness and show a broad effective absorption bandwidth of 5.0 GHz. The Mo2N@CoFe@C/CNT composites hold the following advantages: (1) hierarchical core–shell structure offers plentiful of heterojunction interfaces and triggers interfacial polarization, (2) unique electronic migration/hop paths in the graphitized C/CNTs and Mo2N rod facilitate conductive loss, (3) highly dispersed magnetic CoFe nanoparticles within “tubes on rods” matrix build multi-scale magnetic coupling network and reinforce magnetic response capability, confirmed by the off-axis electron holography.

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Nitrogen-doped Co-C/MWCNTs nanocomposites derived from bimetallic metal–organic frameworks for electromagnetic wave absorption in the X-band

Cited by 384 publications

References 54 publications

Two-Step Solvothermal Synthesis of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs Hybrid with Enhanced Low Frequency Microwave Absorbing Performance

Two-Step Solvothermal Synthesis of (Zn0.5Co0.5Fe2O4/Mn0.5Ni0.5Fe2O4)@C-MWCNTs Hybrid with Enhanced Low Frequency Microwave Absorbing Performance

Recent Development in Fabrication of Co Nanostructures and Their Carbon Nanocomposites for Electromagnetic Wave Absorption

Hierarchical Magnetic Network Constructed by CoFe Nanoparticles Suspended Within “Tubes on Rods” Matrix Toward Enhanced Microwave Absorption

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