Porous Molybdenum Compound Design for Strong Microwave Absorption

Wei, Tingcha; Zhu, Xingzhong; Xu, Jianing; Kan, Caixia; Shi, Dan

doi:10.1021/acs.langmuir.2c03095

Cited by 12 publications

(2 citation statements)

References 57 publications

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“…The RL of the PS-based samples was estimated by the transmission line theory. − The relative permittivity (ε), relative permeability (μ), and impedance matching ( Z ) are the salient parameters tuning microwave-absorbing features. Conductive loss and polarizations, including dipole and interfacial polarization, bring permittivity; meanwhile, natural resonance, exchange resonance, and eddy current loss establish permeability.…”

Section: Resultsmentioning

confidence: 99%

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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