Large Microsphere Structure of a Co/C Composite Derived from Co-MOF with Excellent Wideband Electromagnetic Microwave Absorption Performance

Zhang, Mengyi; Sun, Xiaohui; Cai, Xudong; Zhan, Xiaolu; Wu, Yufei; Zhang, Xuyang; Wu, Guohua; Wang, Xiangwei

doi:10.1021/acsami.3c12986

Cited by 13 publications

(1 citation statement)

References 81 publications

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“…The attenuation constant (α) is an important metric for evaluating the microwave attenuation capacity of nanocomposites; a higher α value indicates a correspondingly greater ability to attenuate microwaves. The Z and α values can be obtained from Equations and (), ,, respectively, and their relationships with frequency are shown in Figure . Furthermore, to comprehensively analyze the MA mechanism in nanocomposites, detailed data regarding their MA performance are presented in Table S3.…”

Section: Resultsmentioning

confidence: 99%

Hollow Core–Shell Fe₃O₄@PPy Nanocomposites with Tunable Microwave Absorption Frequencies and High Reflection Loss

Tang,

Du,

et al. 2024

ACS Appl. Nano Mater.

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Core−shell structures are commonly employed in microwave absorption (MA) materials due to their distinctive interfacial architecture. In this study, ferroferric oxide@polypyrrole (Fe 3 O 4 @PPy) nanocomposites with hollow core−shell structures were successfully synthesized for MA using a solvothermal process, followed by in situ polymerization. The minimum reflection loss (RL min ) frequency of the nanocomposites can be precisely controlled by adjusting the thickness of the PPy shell. The thickening of the PPy shell enhances the conduction loss of the nanocomposites, thus, enhancing the dielectric loss of the nanocomposites. The fabricated FP-170, FP-180 and FP-190 nanocomposites exhibit remarkable MA properties at low frequencies, with their RL min reaching −63.82 dB, −84.92 dB, and −71.25 dB at 4.55 mm, 3.87 mm, and 2.64 mm, respectively. The maximum effective absorption bandwidth (EAB max ) of FP-170 extends to 3.48 GHz at 2.39 mm, FP-180 extends to 4.20 GHz at 2.38 mm, and FP-190 extends to 4.96 GHz at 2.16 mm. The FP-200 nanocomposite, which has PPy shell thickness of 15 nm, exhibits exceptional radar stealth performance, with Radar Cross-Section (RCS) values below −17.68 dB•m 2 within the range of −90°to 90°. Both simulation and experimental results prove that the hollow core−shell structured Fe 3 O 4 @PPy nanocomposite is an excellent candidate for MA applications.

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Section: Resultsmentioning

confidence: 99%

Hollow Core–Shell Fe₃O₄@PPy Nanocomposites with Tunable Microwave Absorption Frequencies and High Reflection Loss

Tang,

Du,

et al. 2024

ACS Appl. Nano Mater.

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Regulation of PPy Growth States by Employing Porous Organic Polymers to Obtain Excellent Microwave Absorption Performance

Zhang,

Du,

Tang

et al. 2024

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Regulating the different growth states of polypyrrole (PPy) is a key strategy for obtaining PPy composites with high electromagnetic wave (EMW) absorption properties. This work finds that the growth states of PPy is regulated by controlling the amount of pyrrole added during the preparation of composites, so as to regulate the development of conductive networks to obtain excellent EMW absorption performance. The POP/PPy‐200 composite achieves an effective absorption bandwidth (EAB) of 6.24 GHz (11.76–18.00 GHz) at a thickness of only 2.34 mm, covering 100% of the Ku band. The minimum reflection loss of −73.05 dB can be demonstrated at a thickness of only 2.29 mm, while at the same time showing an EAB of 5.96 GHz to meet the requirements of “thin”, “light”, “wide”, and “strong”. Such excellent EMW absorption performance is attributed to the conductive loss caused by the regulation of the growth states of PPy and the polarization loss caused by the heterostructure. This work also addresses the key challenge that porous organic polymers (POPs) cannot be applied to EMW absorption due to poor conductivity and providing new insights into the candidates for EMW absorbing materials.

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Metasurface-assisted low-frequency performance enhancement of ultra-broadband honeycomb absorber based on carbon nanotubes

Wang,

Bai,

Zhao

et al. 2024

Nano Res.

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Large Microsphere Structure of a Co/C Composite Derived from Co-MOF with Excellent Wideband Electromagnetic Microwave Absorption Performance

Cited by 13 publications

References 81 publications

Hollow Core–Shell Fe₃O₄@PPy Nanocomposites with Tunable Microwave Absorption Frequencies and High Reflection Loss

Hollow Core–Shell Fe₃O₄@PPy Nanocomposites with Tunable Microwave Absorption Frequencies and High Reflection Loss

Regulation of PPy Growth States by Employing Porous Organic Polymers to Obtain Excellent Microwave Absorption Performance

Metasurface-assisted low-frequency performance enhancement of ultra-broadband honeycomb absorber based on carbon nanotubes

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Large Microsphere Structure of a Co/C Composite Derived from Co-MOF with Excellent Wideband Electromagnetic Microwave Absorption Performance

Cited by 13 publications

References 81 publications

Hollow Core–Shell Fe3O4@PPy Nanocomposites with Tunable Microwave Absorption Frequencies and High Reflection Loss

Hollow Core–Shell Fe3O4@PPy Nanocomposites with Tunable Microwave Absorption Frequencies and High Reflection Loss

Regulation of PPy Growth States by Employing Porous Organic Polymers to Obtain Excellent Microwave Absorption Performance

Metasurface-assisted low-frequency performance enhancement of ultra-broadband honeycomb absorber based on carbon nanotubes

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Hollow Core–Shell Fe₃O₄@PPy Nanocomposites with Tunable Microwave Absorption Frequencies and High Reflection Loss

Hollow Core–Shell Fe₃O₄@PPy Nanocomposites with Tunable Microwave Absorption Frequencies and High Reflection Loss