Conductive substrates-based component tailoring via thermal conversion of metal organic framework for enhanced microwave absorption performances

Huang, Xiaogu; Ma, Yongbin; Lai, Haoran; Jia, Qi; Zhu, Lei; Li, Jun; Quan, Bin

doi:10.1016/j.jcis.2021.10.137

Cited by 32 publications

(7 citation statements)

References 47 publications

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“…Microwave absorption in FM-350 and FM-650 relies mainly on eddy current loss (Figure 6f−h). Meanwhile, impedance matching (Z = |Z in / Z 0 |), considered a prerequisite for the entry of incident microwaves, can be analyzed through characteristic input impedance 43,44 The 1/4 wavelength model, shown in Figure 6i−l, can provide insights into the relationship between the RL, matching thickness, and frequency. The RL curves for specific thicknesses reach the RL min at the frequency where Z is close to 1, particularly for FM-550, and the t m values fall near the λ/4 curves.…”

Section: Resultsmentioning

confidence: 99%

“…Microwave absorption in FM-350 and FM-650 relies mainly on eddy current loss (Figure f–h). Meanwhile, impedance matching ( Z = | Z in / Z 0 |), considered a prerequisite for the entry of incident microwaves, can be analyzed through characteristic input impedance , Z = | Z in / Z 0 | = μ r ε r nobreak0em0.1em⁡ tan nobreak0em0.25em⁡ normalh ( j 2 π fd c μ normalr ε normalr ) …”

Section: Resultsmentioning

confidence: 99%

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3D Honeycomb Fe/MXene Derived from Prussian Blue Microcubes with a Tunable Structure for Efficient Low-Frequency and Flexible Electromagnetic Absorbers

Liu,

Yu,

Zhao

et al. 2023

ACS Appl. Mater. Interfaces

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The unique layered structure and high conductivity of MXene materials make them highly promising for microwave absorption. However, the finite loss mechanism and severe agglomeration present challenging obstacles for ideal microwave absorbers, which could be effectively improved by constructing a three-dimensional (3D) porous structure. This study reports a 3D honeycomb MXene using a straightforward template method. The 3D MXene framework offers ample cavities to anchor the Prussian blue microcubes and their derivatives including Fe microboxes and Fe clusters by a simple annealing process. Based on the superiority of the 3D honeycomb architecture and magnetic–dielectric synergistic effects, the Fe/MXene absorbers demonstrate outstanding microwave absorption capabilities with the optimum reflection loss value of −40.3 dB at 2.00 mm in the low-frequency range from 4.2 to 5.6 GHz. The absorber also manifests superior radar wave attenuation by finite element analysis and exhibits great potential to be a flexible and thermal insulation material in a wide range of temperatures. This work proposes a useful reference for the design of 3D MXene-based porous architectures, and the synergistic magnetic–dielectric strategy further expands the potential of MXene-based absorbers, enabling them to be used as flexible and highly efficient microwave absorbers.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

3D Honeycomb Fe/MXene Derived from Prussian Blue Microcubes with a Tunable Structure for Efficient Low-Frequency and Flexible Electromagnetic Absorbers

Liu,

Yu,

Zhao

et al. 2023

ACS Appl. Mater. Interfaces

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“…Obviously, it is insufficient to express the complex permittivity of a material using simply the ideal Debye equation; the influence of conductivity must also be taken into account. Therefore, formula can be rewritten as follows ε ″ = ( ε s − ε ∞ ) 2 π f τ 1 + false( 2 π f false) 2 τ 2 + σ 2 π f ε 0 where ε 0 = 8.85 × 10 –12 F/M represents the vacuum dielectric constant and σ is the conductivity of materials . The ideal Debye formula can be written as the Cole–Cole circle true( ε false′ − ε normals + ε ∞ 2 true) 2 + false( ε false″ false) 2 = true( ε normals − ε ∞ 2 true) 2 If the material is in an ideal Debye state, with ε ′ as abscissa and ε ″ as ordinate, the complex permittivity of the material will form a semicircle with a center of ( ε s − ε ∞ 2 ) …”

Section: Resultsmentioning

confidence: 99%

“…The sources of magnetic loss of materials are as follows: (1) the hysteresis loss caused by the change of the magnetic induction intensity due to the irreversible movement of the domain wall or the magnetic moment with the strength of the applied magnetic field, (2) induced current under alternating magnetic field and Joule heat generated by the ferromagnet, which causes the eddy current loss, and (3) natural resonance loss under the action of an external magnetic field due to the presence of a magnetocrystalline anisotropy field. ,, However, hysteresis loss needs to be generated under a large magnetic field, and the alternating magnetic field that generates electromagnetic waves is small. Therefore, the sources of magnetic loss of absorbing materials are natural resonance loss and eddy current loss.…”

Section: Resultsmentioning

confidence: 99%

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FeCo/Graphene Nanocomposites for Applications as Electromagnetic Wave-Absorbing Materials

Zhang

Guo

et al. 2022

ACS Appl. Nano Mater.

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Simple and efficient preparation high-performance magnetic carbon-based nanocomposites as electromagnetic wave-absorbing materials is a research hotspot. Here, employing a straightforward, ecologically friendly, and effective solid-state technique, FeCo/graphene nanocomposites with good electromagnetic wave absorption capabilities were successfully fabricated without the use of any external carbon sources. m-NaCl powder is combined with Co(acac)2 and Fe(acac)3 and then annealed at a particular temperature. During the annealing process, FeCo nanoparticles were synthesized and supported on graphene nanocomposites. Following annealing at 700 °C, the material showed an ideal reflection loss of −71.63 dB at 10.8 GHz, an effective bandwidth of 4.24 GHz, and a thickness of 2.68 mm. The radar cross section (RCS) of FeCo/C-700 is less than −10 dB m2, which provides evidence that the samples have good radar wave attenuation capabilities when the scattering angle is between 0 and 60°. The approach for creating graphene composites with FeCo nanoparticles suggested in this study serves as a crucial source of inspiration for the later development of new magnetic carbon nanocomposite systems.

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Facile Fabrication of Melamine/MXene/FeNi‐PBA Composite Derived Multi‐Interface Magnetic Carbon Foam for High‐Efficiency Microwave Absorption

Yu,

Luo,

et al. 2024

Adv Elect Materials

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The development of novel materials with high‐efficiency microwave absorption is crucial for mitigating the adverse impacts of electromagnetic pollution. In this study, MXene and FeNi Prussian blue analogs (PBA) are assembled onto a melamine foam using self‐assembly and in situ growth technique. Subsequently, magnetic carbon foam, comprising FeNi alloys, TiN and carbon with various morphologies, is synthesized via carbothermal reduction reaction. The surface morphology electromagnetic properties are significantly influenced by the pyrolysis temperature. The results revealed that the magnetic carbon foam composite demonstrated an effective microwave absorption bandwidth of 4.72 GHz at a thickness of only 1.5 mm, with a minimum reflection loss of −24.83 dB at 1.3 mm. The outstanding microwave absorption performance can be attributed to the 3D conductive network formed by N‐doped carbon, as well as the contributions from polarization loss, magnetic loss, and suitable impedance matching. Furthermore, the corresponding absorber coating demonstrated a maximum reduction value of radar cross‐section (RCS) by 13.16 dB m2. This research offers novel insights for the development of lightweight and efficient low‐filled electromagnetic composite for broadband microwave absorption.

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Conductive substrates-based component tailoring via thermal conversion of metal organic framework for enhanced microwave absorption performances

Cited by 32 publications

References 47 publications

3D Honeycomb Fe/MXene Derived from Prussian Blue Microcubes with a Tunable Structure for Efficient Low-Frequency and Flexible Electromagnetic Absorbers

3D Honeycomb Fe/MXene Derived from Prussian Blue Microcubes with a Tunable Structure for Efficient Low-Frequency and Flexible Electromagnetic Absorbers

FeCo/Graphene Nanocomposites for Applications as Electromagnetic Wave-Absorbing Materials

Facile Fabrication of Melamine/MXene/FeNi‐PBA Composite Derived Multi‐Interface Magnetic Carbon Foam for High‐Efficiency Microwave Absorption

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