Waxberry-like hierarchical Ni@C microspheres with high-performance microwave absorption

Liu, Dawei; Du, Yunchen; Xu, Ping; Liu, Na; Wang, Yahui; Zhao, Honghong; Cui, Liru; Han, Xijiang

doi:10.1039/c9tc00771g

Cited by 223 publications

(78 citation statements)

References 67 publications

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“…As shown, both the l 0 and l 00 values of the hybrids present undesirable decreases to some extent, particularly that the values of l 0 and l 00 become less than 1.0 and 0.0 in the frequency ranges of 2.0-18.0 and 4.0-18.0 GHz, respectively. This abnormal phenomenon was also observed in previous studies and is widely attributed to the radiation of magnetic energy [64,65]. Under the applied EM field, the motion of charges in NiO will produce an AC electric field, which can further induce an internal magnetic field according to the Maxwell equations.…”

Section: Resultssupporting

confidence: 73%

Synergetic dielectric loss and magnetic loss towards superior microwave absorption through hybridization of few-layer WS2 nanosheets with NiO nanoparticles

et al. 2020

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Section: Resultssupporting

confidence: 73%

Synergetic dielectric loss and magnetic loss towards superior microwave absorption through hybridization of few-layer WS2 nanosheets with NiO nanoparticles

et al. 2020

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“…Furthermore, derivative internal magnetic field can be induced by an alternating current electric field generated by the eddy current (Qiu et al, 2016). At high frequency, the loss capability of Ni nanoparticles may be gradually counteracted with the consolidation of the internal magnetic field, resulting in the decreased complex permeability (Liu et al, 2019).…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electromagnetic Absorption Properties of Commercial Ni/MWCNTs Composites by Adjusting Dielectric Properties

Zhao

Wang

2020

Front. Chem.

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In this manuscript, we constructed a Ni/MWCNTs absorber and properly adjusted the permittivity resulted from absorber content in the PVDF to optimize impedance matching properties. Both ε ′ and ε ′′ increase obviously with the increasing content of Ni/MWCNTs in PVDF, demonstrating that dielectric properties are dependent on the conductivity. Moderate dielectric properties and excellent impedance matching can be obtained for the filler content of 20 wt% Ni/MWCNTs. Reasonable impedance matching allows electromagnetic waves to propagate into the materials and finally realize energy dissipation through dielectric loss and interfacial polarization. As expected, the minimum reflection loss (RL) of −46.85 dB at 6.56 GHz with a low filler loading (20 wt%) and wide effective bandwidth (RL<-10 dB) of 14.0 GHz in the thickness range of 1.5-5.0 mm was obtained for the commercial Ni/MWCNTs composites, which is promising for mass production in industrial applications. Our findings offer an effective and industrialized way to design high-performance material to facilitate the research in microwave absorption.

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“…Without the melamine participating in the reaction, CNTs cannot be generated. SEM images of Ni-C/CNTs composites are displayed in Fig peaks appeared at about 2θ = 41.8°, 47.5° and 62.1° can be assigned to (100), (101) and (102) planes of carbon (JCPDS No.80 − 0004) [27,28], respectively. The diffraction peaks at 2θ = 44.5°, 51.8° and 76.4°m atched well with (111), (200) and (220) planes of metal Ni with face-centered cubic (fcc) structure (JCPDS No.04-0805), respectively, indicating that Ni 2+ of Ni-MOF precursor have been reduced into Ni particles by reacting with carbon [29].…”

Section: Resultsmentioning

confidence: 99%

Nickel Carbon Composite With Carbon Nanotubes for Efficient Electromagnetic Wave Absorption

Qiu

Yang²,

Li³

et al. 2020

Preprint

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Nickel carbon composite with carbon nanotubes (Ni-C/CNTs) has been fabricated by pyrolysis the mixture of nickel-based metal organic framework (Ni-MOF) and melamine. The resultant Ni-C/CNTs composite is assembled from one-dimensional (1D) CNTs and three dimensional (3D) spherical Ni-C composite. Besides, the Ni-C/CNTs composite contains abundant nitrogen(N) dopants that contributes to defect dipole polarization. The diameter and length of CNTscan beeffected by changing the mass ratio of Ni-MOF and melamine. The optimizedNi-C/CNTs composite exhibits reflection loss of -55.1 dB at 10.56 GHz, and the effective absorbing bandwidth (reflection loss < -10 dB) is 11.2 GHz (6.0-17.2 GHz)with the thickness range of 1.5-4.0 mm, when the mass ratio of Ni-MOF: melamine is 1: 2. These results indicate that the mixed 1D-3D hierarchical architecture synergistically improves electromagnetic wave absorption properties. This strategy willcontribute for fabricating the carbon hybrid network consisting of metal organic frameworks derived metal/carbon hybrid and CNTs for electromagnetic wave absorption.

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Waxberry-like hierarchical Ni@C microspheres with high-performance microwave absorption

Abstract: Hierarchical architecture and core–shell configuration synergistically endowed waxberry-like Ni@C microspheres with an upgraded microwave absorption performance.

Cited by 223 publications

References 67 publications

Synergetic dielectric loss and magnetic loss towards superior microwave absorption through hybridization of few-layer WS2 nanosheets with NiO nanoparticles

Synergetic dielectric loss and magnetic loss towards superior microwave absorption through hybridization of few-layer WS2 nanosheets with NiO nanoparticles

Enhanced Electromagnetic Absorption Properties of Commercial Ni/MWCNTs Composites by Adjusting Dielectric Properties

Nickel Carbon Composite With Carbon Nanotubes for Efficient Electromagnetic Wave Absorption

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