Multistage coupling of interface and core–shell engineering of a cobalt-based heterostructure for integration of multiple electromagnetic absorption

Zhou, Jun; Guo, Hu; Di, Jun; Liu, Guigao; Jiang, Wei

doi:10.1039/d3ta03778a

Cited by 10 publications

(2 citation statements)

References 48 publications

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“…The presence of multiple twisted Cole–Cole semicircles on the Debye relaxation curves can be seen in Figure a–d, indicating the presence of other polarization mechanisms such as conductivity loss, interfacial polarization, oxygen defects, etc. , Where the two Cole–Cole semicircles of Figure a correspond to the two relaxation peaks at 2.44 and 14.68 GHz for the ε″ of the S 0 sample. The FeSiAl surface is coated with massive PANI, resulting in abundant nonhomogeneous interfaces, and under the action of alternating electromagnetic field, the charge aggregates on the nonhomogeneous interfaces to produce interfacial polarization. − Besides the interfacial polarization, the FeSiAl@PANI composites introduced a large number of defects during the preparation process, and these defects and the functional groups of PANI can act as a dipole, whose directional rotation induces a dipole polarization. , Thus, the relative concentration of the two semicircles indicates the dipole polarization and interfacial polarization produced by the PANI cladding (Figure b). Moreover, as shown in Figure b–d, there is a long smooth tail appearing in the Cole–Cole plots of S 1 , S 2 , and S 3 samples.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Liu,

Sun,

Yan

et al. 2023

ACS Appl. Electron. Mater.

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Composites of ferromagnetic particles and conductive polymers have potential applications in the wave-absorbing stealth technology. In this paper, FeSiAl@polyaniline (FeSiAl@ PANI) composites were prepared through in situ oxidative polymerization. Electromagnetic parameters of the FeSiAl composites were modulated by varying the aniline content. The inhomogeneous interface between amorphous PANI and FeSiAl provides interfacial polarization, charge accumulation, and defects in the PANI layer, which causes dipole polarization and conductive loss, so that multiple loss mechanisms result in the FeSiAl@PANI composites with superior absorbing properties. When 1 g of aniline monomer is added, the lowest reflection loss (RL) can be obtained for the S 1 sample at a thickness of only 1 mm with an RL min value of −37.87 dB. Radar cross-sectional (RCS) simulations using computer simulation technology (CST) for the S 1 sample showed an RCS reduction value of 31.64 dBm 2 . Therefore, the FeSiAl@PANI composite is anticipated to be a candidate material for radar stealth technology and electromagnetic absorption.

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Section: Resultsmentioning

confidence: 99%

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Liu,

Sun,

Yan

et al. 2023

ACS Appl. Electron. Mater.

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“…With the continued progress of modern science, microwave-absorbing materials are highly critical in numerous areas, such as electronic devices, resident health, and digital security. − The emergence of these needs can further deepen research on microwave-absorbing materials. Typically, microwave absorption performance relies on permittivity (ε r = ε′ – j ε″), permeability (μ r = μ′ – j μ″), proper impedance matching, and excellent attenuation constants, which are mainly under the control of conductivity, dielectric loss, magnetic loss, , and so on.…”

Section: Introductionmentioning

confidence: 99%

Solvothermally Synthesized Co(CoO)/Ti₃C₂T_x/TiO₂ Nanocomposites for Enhanced Microwave Absorption

Liu,

Wang,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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Ti 3 C 2 T x MXene has already been studied as an appealing microwave absorption material, benefiting from its fascinating laminated structure. Nevertheless, the single absorption mechanism of pure Ti 3 C 2 T x MXene results in poor impedance matching. In this paper, magnetic Co nanoparticles were introduced on Ti 3 C 2 T x MXene by using a simple solvothermal method. By introducing different contents of Co nanoparticles, the impedance matching and magnetic properties of the Co(CoO)/ Ti 3 C 2 T x /TiO 2 nanocomposites could be optimized. It is demonstrated that the effective absorption bandwidth of Co-(CoO)/Ti 3 C 2 T x /TiO 2 nanocomposites is 5.84 GHz (6.88−12.72 GHz), while the minimum reflection loss is −61.02 dB. Comparatively, our Co(CoO)/Ti 3 C 2 T x /TiO 2 nanocomposites exhibited better satisfied microwave absorption performance. The potential mechanism of microwave absorption was fully explored. Our report provides a simple and safe method to design high-efficiency absorbers which rely on Ti 3 C 2 T x .

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Conductivity and interaction mechanism of polydopamine-graphene oxide: a combined experimental and density functional theory investigation

Cheng,

Li,

Yang

et al. 2024

J Polym Res

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The electrochemical activity of electrode material plays an important role in enhancing energy storage e ciency in ow batteries (FBs). Polydopamine (PDA) mixed with graphene oxide (GO) exhibited improved performance. However, few studies investigated on the interplay between DA and GO, particularly the in uence of GO's functional groups on its adsorption e cacy. In this study, the prepared PDA-GO composites were formed by a straightforward and eco-friendly approach. The impact of the PDA on GO's electrical conductivity and the ratio of the DA-to-GO was explored. Furthermore, the impacts of various oxygen-containing functional groups on the adsorption DA process of GO were thoroughly explored using density functional theory (DFT) calculations. Focusing on the adsorption energy, charge density difference, energy gap, and reaction barrier. PDA-GO exhibits the strongest electrical conductivity where the addition ratio of DA-to-GO is 1:2. PDA partially reduction the GO in the process of combining with GO, and the layer spacing increases. DFT calculations indicated that the reduction of DA to GO happens mostly in the epoxy groups, and the basal plane of PDA-GO remains reasonably intact, while the conductivity is greatly improved by the binding of DA to the epoxy groups. DA molecules tend to align parallel to the graphene sheet during the optimization process. The results suggest that a portion of DA molecules in ltrate the interlayer of GO, engaging in π-π and hydrogen bonding interactions with GO during the preparation phase. On the other hand, the epoxy group signi cantly destroys the π-π interaction between GO and DA, resulting in a reduction in the adsorption energy between the two, whereas the remaining functional groups enhance both. However, the augmentation of the DA adsorption energy by the hydroxyl groups on the surface of the GO is dramatically diminished when the hydroxyl groups on GO reach a particular density owing to the breakdown of the π-π interaction. This study serves as a theoretical foundation for the selective synthesis of PDA-GO composites and fresh ideas for their further utilization in electrode materials.

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Multistage coupling of interface and core–shell engineering of a cobalt-based heterostructure for integration of multiple electromagnetic absorption

Abstract: Herein, a heterostructure fabricated by the coupling of interface engineering and a core–shell concept is reported. Both the experimental and RCS simulation results confirm that the absorber can effectively suppress EM scattering.

Cited by 10 publications

References 48 publications

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Solvothermally Synthesized Co(CoO)/Ti₃C₂T_x/TiO₂ Nanocomposites for Enhanced Microwave Absorption

Conductivity and interaction mechanism of polydopamine-graphene oxide: a combined experimental and density functional theory investigation

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Multistage coupling of interface and core–shell engineering of a cobalt-based heterostructure for integration of multiple electromagnetic absorption

Abstract: Herein, a heterostructure fabricated by the coupling of interface engineering and a core–shell concept is reported. Both the experimental and RCS simulation results confirm that the absorber can effectively suppress EM scattering.

Cited by 10 publications

References 48 publications

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Fabrication and Microwave Absorption Properties of FeSiAl@PANI Composites

Solvothermally Synthesized Co(CoO)/Ti3C2Tx/TiO2 Nanocomposites for Enhanced Microwave Absorption

Conductivity and interaction mechanism of polydopamine-graphene oxide: a combined experimental and density functional theory investigation

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Product

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Solvothermally Synthesized Co(CoO)/Ti₃C₂T_x/TiO₂ Nanocomposites for Enhanced Microwave Absorption