Designing of an rGO-based heterostructure for highly efficient microwave absorption performance and flame retardancy

Li, Yingming; Li, Yiran; Hu, Wen-Juan; Wang, De‐Yi

doi:10.1016/j.ceramint.2023.07.227

Cited by 4 publications

(2 citation statements)

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“…56 When the curve plotted by ε′ and ε″ formed a semicircle, the materials underwent the process of dielectric polarization relaxation, otherwise, conductive loss was generated. 57 No obvious Cole−Cole semicircle was observed for PCNF samples (Figure 6d), suggesting that the polarization relaxation process was hidden by the carrier mobility, and the conductive loss of the sample played the main role in the dielectric loss. However, Fe 7 S 8 /PCNF and Fe 7 S 8 /PCNF@ANF displayed multiple semicircles, suggesting the existence of multiple relaxation processes originating from the polarization effect (Figure 6e,f).…”

Section: Resultsmentioning

confidence: 98%

“…When the curve plotted by ε′ and ε″ formed a semicircle, the materials underwent the process of dielectric polarization relaxation, otherwise, conductive loss was generated . No obvious Cole–Cole semicircle was observed for PCNF samples (Figure d), suggesting that the polarization relaxation process was hidden by the carrier mobility, and the conductive loss of the sample played the main role in the dielectric loss.…”

Section: Resultsmentioning

confidence: 99%

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Lightweight, Compressible, and Multifunctional Organic–Inorganic Nanofibrous Aerogels for Enhanced Microwave Absorption

Wang,

Han,

Zhou

et al. 2024

ACS Appl. Nano Mater.

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Three-dimensional aerogels with ultralow density and extraordinary mechanical properties have attracted a lot of interest for their broad technological applications. Herein, lightweight, compressible, and multifunctional organic−inorganic nanofibrous aerogels are constructed by combining inorganic Fe 7 S 8 doped honeycomb-like porous carbon nanofiber (Fe 7 S 8 /PCNF) and organic aramid nanofiber (ANF). The obtained Fe 7 S 8 /PCNF@ANF nanofibrous hybrid aerogels exhibit an interconnected lamellar structure, which endows the aerogels with an ultralow density of 0.014 g/cm 3 and excellent compressibility of more than 95% compressive stress retention after 100 cycles at 40% strain. As an electromagnetic microwave absorber, the interconnected lamellar structure of aerogels, the homogeneously doped Fe 7 S 8 nanosheets, and the honeycomb-like pores of carbon nanofiber enhance the impedance matching, enabling more microwaves to enter the aerogels to be dissipated. More importantly, the macroscopic lamellar network induces multiple reflecting and scattering to extend the transmitted pathways of microwaves, thus enhancing the attenuation ability of the absorber. When the mass-filling ratio of the materials to paraffin wax is 1:9, the obtained aerogels achieve a strong absorption of −37.0 dB at 15.7 GHz and a broad bandwidth of 5.52 GHz at a thickness of 2.0 mm. Meanwhile, the obtained aerogels present superior thermal insulation performance with thermal conductivity of 0.193 W/mK and outstanding hydrophobicity property with a water contact angle of 145°, guaranteeing the durable application of the absorber in extremely humid and high-temperature environments. This work may shed some light on designing new-generation microwave absorbing materials with multiple applications.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%