Constructing excellent electromagnetic wave absorber with dielectric-dielectric media based on 3D reduced graphene and Ag(I)-Schiff base coordination compounds

Xu, Yan; Li, Jinhuan; Ji, Huanmin; Zou, Xuexue; Zhang, Jiaojiao; Yan, Yi

doi:10.1016/j.jallcom.2018.12.069

Cited by 7 publications

(5 citation statements)

References 52 publications

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“…Most researchers improve its wave-absorbing effect by compounding it with carbon materials, and the effect is significant. , It is worth noting that the excellent absorbing performance of this composite material is mainly provided by the strong dielectric loss capability of the carbon-based material itself, and the loss capability of the Schiff base absorber is not strong. For example, the Ag–Schiff base/rGO composite studied by Xu et al can reach an effective absorption bandwidth of 6.28 GHz . While the minimum absorption peak of the Ag–Schiff base complex is −3.23 dB, with no effective absorption bandwidth.…”

Section: Introductionmentioning

confidence: 99%

“…Radio waves have been greatly enriched and developed, touching every aspect of our lives, providing us with convenience, but also leaving a lot of electromagnetic pollution. − Electromagnetic pollution not only threatens human health but also interferes with the normal operation of machines, so absorbing materials has attracted people’s attention. − An absorbing material refers to a material that can absorb and attenuate the energy of incident electromagnetic waves and convert electromagnetic energy into heat energy dissipation or disappearance . The ideal absorbing material should have the characteristics of “lightweight, thin thickness, wide absorption band, and strong absorption peak.” In recent years, the Schiff base has been widely used in the development of new materials due to its mild and simple reaction conditions, single reaction products, and dynamic reversible reaction characteristics. − It has been reported that the Schiff base can improve its conductivity and electromagnetic properties by doping with metal ions, − so it is a kind of wave-absorbing material with good characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the Ag−Schiff base/rGO composite studied by Xu et al can reach an effective absorption bandwidth of 6.28 GHz. 24 While the minimum absorption peak of the Ag−Schiff base complex is −3.23 dB, with no effective absorption bandwidth. The effective absorption bandwidth of 3D-rGA is 5.8 GHz, and the minimum absorption value is −35.79 dB.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of the Fe-Doped Corona Schiff Base for Enhanced Microwave Absorption Performance

Li,

Hua,

Yuan

et al. 2023

ACS Omega

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A corolla-shaped Schiff base polymer was synthesized from terephthalaldehyde (TPAD), glutaraldehyde (GA), and p-phenylenediamine (PPD) by block copolymerization, and Schiff base iron complexes were formed by doping with FeCl3. The microscopic morphology, crystal structure, and elemental valence state were characterized by field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Comparing the change of conductivity before and after Fe3+ doping, it was found that the conductivity did not break away from the category of insulator, and the doped sample is a paramagnetic material. Morphological changes were observed by adjusting the ratio of GA to TPAD, and it was found that the corolla-like structure was most complete when the ratio of GA to TPAD was 2:1, and its Schiff base iron complex absorbed waves better. At a thickness of 3 mm, the absorption effect can reach below −10 dB at 12.44–15.16 GHz, and the maximum absorption value is −45.07 dB at a thickness of 3.8 mm; it is an organic absorbing agent with excellent impedance matching and absorbing properties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of the Fe-Doped Corona Schiff Base for Enhanced Microwave Absorption Performance

Li,

Hua,

Yuan

et al. 2023

ACS Omega

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“…Currently, the composite based on organic dielectric materials with PPy provides another strategy to fabricate high-performance EMW absorbing materials. The obtained organic dielectric–dielectric composites possess a light weight and high stability due to their physical similarity [ 22 ]. More importantly, a strong microwave absorption capability can be achieved by adopting effective CPs dielectric fillers.…”

Section: Introductionmentioning

confidence: 99%

Polypyrrole/Schiff Base Composite as Electromagnetic Absorbing Material with High and Tunable Absorption Performance

Huang

et al. 2022

Molecules

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In recent years, Schiff base-related conjugated systems have received extensive attention, but little research has been done in the field of electromagnetic materials. In this work, an organic conjugated system based on polypyrrole/hydrazone Schiff base (PPy/HSB) composites was constructed via a Schiff base synthetic route and their electromagnetic behavior was investigated. The electromagnetic response of PPy/HSB complexes demonstrates fine electromagnetic absorption performance. When the filler loading is 30 wt% in a paraffin matrix, an absorption peak of −43.1 dB was achieved and its effective absorption bandwidth (EAB) was located in the range of 10.88−18.0 GHz. The electromagnetic response behavior of PPy/HSB complexes is explained by models involving electronic structure, multi-polarization and conductive network. The mechanisms of PPy/HSB complexes formation and HSB crystallization are also discussed through the compatibility of PPy/HSB and the structure of HSB. Moreover, the morphology transformation of HSB in the PPy/HSB systems has been studied. This study opens the exploration of organic–dielectric conjugated systems in the field of electromagnetic materials, and significantly broadens the application range of organic–dielectric–dielectric composites.

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“…Researchers have investigated magnetic and dielectric ceramics for possible application as a microwave absorber [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The absorption has been optimized by increasing dielectric and/or magnetic losses through doping of divalent, trivalent, tetravalent ions, etc.…”

Section: Introductionmentioning

confidence: 99%

Microwave Absorption in Ceramics: Different Mechanisms and its Optimization

Narang

Singh

Jotania

2019

Engineering Magnetic, Dielectric and Microwave Properties of Ceramics and Alloys

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In the current scenario of technological devices, industrial, domestic and military applications involve high speed electronic devices operating in GHz region. The microwave absorbers are the key materials incorporated to mitigate electromagnetic interference emanated from high speed electronic devices. In the present chapter, we have discussed microwave absorption mechanisms which are not much explored analytically as well as comprehensively. The necessary mathematical models responsible for absorption have been elaborated with pertinent mechanisms. Both material science and engineering aspects have been covered to elaborate on the conceptual understanding of optimization of microwave absorptions in any ceramics.

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Constructing excellent electromagnetic wave absorber with dielectric-dielectric media based on 3D reduced graphene and Ag(I)-Schiff base coordination compounds

Cited by 7 publications

References 52 publications

Fabrication of the Fe-Doped Corona Schiff Base for Enhanced Microwave Absorption Performance

Fabrication of the Fe-Doped Corona Schiff Base for Enhanced Microwave Absorption Performance

Polypyrrole/Schiff Base Composite as Electromagnetic Absorbing Material with High and Tunable Absorption Performance

Microwave Absorption in Ceramics: Different Mechanisms and its Optimization

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