Novel Preparation of Graphene Foam with Adjustable Dielectric Properties for Efficient Microwave Absorption

Liu, Zhen; Wang, Bo; Wei, Shicheng; Huang, Wei; Jiang, Shanshan; Wang, Yujiang; Liang, Yi; Wang, Xinyang

doi:10.1021/acs.langmuir.3c00876

Cited by 4 publications

(3 citation statements)

References 42 publications

(65 reference statements)

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“…However, exhausting and eliminating the heteroatoms by CO 2 and H 2 plasma mitigate the dipole polarization types and intensities. The closer the Z curve to 1 clarifies more impedance matching . This phenomenon demonstrates that more incident waves penetrate the absorbing medium from the absorber threshold.…”

Section: Resultsmentioning

confidence: 88%

“…The closer the Z curve to 1 clarifies more impedance matching. 44 This phenomenon demonstrates that more incident waves penetrate the absorbing medium from the absorber threshold. Obviously, TP Ar plasma exhibited higher impedance matching, dealing with more of the quarter-wavelength mechanism, canceled waves, and multiple reflections and scattering.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

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Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Selseleh-Zakerin,

Mirkhan,

Shafiee

et al. 2024

Langmuir

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During the past decade, ever-increasing electromagnetic pollution has excited a global concern. A sustainable resource, facile experimental scenario, fascinating reflection loss (RL), and broad efficient bandwidth are the substantial factors that intrigue researchers. This research led to the achievement of a brilliant microwave-absorbing material by treating pampas as biomass. The carbon-based microfibers attained by biowaste were treated by plasma under diverse environments to amplify their microwave-absorbing features. Moreover, a pyrolysis scenario was performed to compare the results. The reductive processes were performed by H 2 plasma and carbonization. However, the CO 2 plasma was performed to regulate the heteroatoms and defects. Interestingly, polystyrene (PS) was applied as a microwaveabsorbing matrix. The aromatic rings existing in the absorbing medium establish electrostatic interactions, elevating interfacial polarization, and physical characteristics of PS augment the practical applications of the final product. The manipulated biomasses were characterized by Raman, X-ray diffraction, energy-dispersive spectroscopy, field emission scanning electron microscopy, and diffuse reflection spectroscopy analyses. Eventually, the microwave-absorbing features were estimated by a vector network analyzer. The plasma-treated pampas under H 2 /Ar blended with PS gained a maximum RL of −90.65 dB at 8.79 GHz and an efficient bandwidth (RL ≤ −10 dB) of 4.24 GHz with a thickness of 3.20 mm; meanwhile, plasma treatment under CO 2 led to a maximum RL of 97.99 dB at 14.92 GHz and an efficient bandwidth of 7.74 GHz with a 2.05 mm thickness. Particularly, the biomass plasmolyzed under Ar covered the entire X and K u bands with a thickness of 2.10 mm. Notably, total shielding efficiencies of the treated bioinspired materials were up to ≈99%, desirable for practical applications.

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Section: Resultsmentioning

confidence: 88%

Section: ■ Results and Discussionmentioning

confidence: 95%

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Selseleh-Zakerin,

Mirkhan,

Shafiee

et al. 2024

Langmuir

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“…Currently, there are two main sample preparation methods for testing the electromagnetic parameters of 3DG composite MAMs. One method involves grinding the sample into powder, which, although to some extent damages the porous network structure of 3DG, is more convenient and beneficial for preparing stealth coatings . The powdered sample, compared to 2D graphene, has a lower density.…”

Section: Dg Composite Materials For Use In Mamentioning

confidence: 99%

Review of Three-Dimensional Graphene and Related Composite Materials for Microwave Absorption

Liu,

Wang,

Wei

et al. 2024

ACS Appl. Nano Mater.

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With the development of modern society and technology, increased levels of electromagnetic pollution have created a greater demand for advanced electromagnetic wave absorption materials for use in both civilian and military applications. Three-dimensional graphene (3DG) has excellent potential for use in the field of microwave absorption (MA) due to its unique porous network structure, low density, and large specific surface area. However, the dielectric loss performance will lead to poor impedance matching performance, making it unsuitable for use as a single absorber. To overcome this shortcoming, 3DG-based composites have been developed by combining 3DG with other absorbing materials to create structures with improved impedance matching performance and absorption efficiency. Compared to other review articles, this Review comprehensively summarizes the preparation methods of 3DG and discusses the advantages and disadvantages of various methods. Subsequently, based on the types of composite materials, the research progress of 3DG-based composite absorptive materials is discussed. Finally, the obstacles to the widespread application of composite absorptive materials based on 3DG are summarized along with future research directions. Finally, the barriers to the widespread use of 3DG-based composite absorbing materials and future research directions are summarized.

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Bimetallic MOF@wood-derived hierarchical porous carbon composites for efficient microwave absorption

Gou,

Hua,

Liu

et al. 2024

Diamond and Related Materials

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Novel Preparation of Graphene Foam with Adjustable Dielectric Properties for Efficient Microwave Absorption

Cited by 4 publications

References 42 publications

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Review of Three-Dimensional Graphene and Related Composite Materials for Microwave Absorption

Bimetallic MOF@wood-derived hierarchical porous carbon composites for efficient microwave absorption

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