Multifunctional carbon foam with hollow microspheres and a concave–convex microstructure for adjustable electromagnetic wave absorption and wearable applications

He, Yingying; Xie, Ping; Li, Shuai; Wang, Yanan; Liao, Daogui; Liu, Hongxia; Zhou, Li; Chen, Yunhua

doi:10.1039/d1ta07527f

Cited by 27 publications

(9 citation statements)

References 32 publications

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“…Thanks to the 3D structure and good impedance matching of N-Ni-Co x S y /Ni x S y @C, an RL min of −48.3 dB and an EAB of 3.95 GHz could be achieved at a thickness of only 1.5 mm. Liu's group [115] fabricated carbonated rGO/Fe 3 O 4 (C-rGO/Fe 3 O 4 ) carbon foams with hollow microspheres through the Pickering emulsion gel technology and annealing process. Cellulose nanofibrils and rGO were selected as carbon sources.…”

Section: Biomass-derived 3d Compositesmentioning

confidence: 99%

Recent advance in three-dimensional porous carbon materials for electromagnetic wave absorption

et al. 2022

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With the increasingly serious electromagnetic wave (EMW) pollution, the development of high-performance EMW absorbing materials (EWAMs) has become a hot topic. Carbon-based EWAMs have excellent chemical stability, high electrical conductivity, and strong dielectric loss. In particular, three-dimensional (3D) porous carbon-based EWAMs have been widely developed in the EMW absorption field. The 3D porous structure not only reduces the materials' mass density, but also improves the multiple reflections of incident EMWs and impedance matching. The carbon-based EWAMs are thus expected to achieve the goals of low density, low thickness, wide absorption bandwidth, and strong absorption. Herein, we first restated the relevant theoretical basis and evaluation methods. Then, we summarized the recent research progress of 3D porous carbon-based EWAMs with the source of the materials as the main clue. Some unique and novel viewpoints were highlighted. Finally, the challenges and prospects of 3D porous carbon-based EWAMs were put forward, which is helpful for guiding a further development of high-performance EWAMs.

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Section: Biomass-derived 3d Compositesmentioning

confidence: 99%

Recent advance in three-dimensional porous carbon materials for electromagnetic wave absorption

et al. 2022

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“…Fe‐based materials have been regarded as the promising candidates for MA owing to their high conductivity and strong magnetic loss ability. [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ] More importantly, Fe‐based materials exhibit multiple phases (Fe 2 O 3 , Fe 3 O 4 , Fe, etc. ), [ 24 , 25 , 26 , 27 , 28 , 29 ] and most phase components display remarkable magnetism.…”

Section: Introductionmentioning

confidence: 99%

Customizing Heterointerfaces in Multilevel Hollow Architecture Constructed by Magnetic Spindle Arrays Using the Polymerizing‐Etching Strategy for Boosting Microwave Absorption

Liu

et al. 2022

Advanced Science

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Heterointerface engineering is evolving as an effective approach to tune electromagnetic functional materials, but the mechanisms of heterointerfaces on microwave absorption (MA) remain unclear. In this work, abundant electromagnetic heterointerfaces are customized in multilevel hollow architecture via a one‐step synergistic polymerizing‐etching strategy. Fe/Fe3O4@C spindle‐on‐tube structures are transformed from FeOOH@polydopamine precursors by a controllable reduction process. The impressive electromagnetic heterostructures are realized on the Fe/Fe3O4@C hollow spindle arrays and induce strong interfacial polarization. The highly dispersive Fe/Fe3O4 nanoparticles within spindles build multi‐dimension magnetic networks, which enhance the interaction with incident microwaves and reinforce magnetic loss capacity. Moreover, the hierarchically hollow structure and electromagnetic synergistic components are conducive to the impedance matching between absorbing materials and air medium. Furthermore, the mechanisms of electromagnetic heterointerfaces on the MA are systematically investigated. Accordingly, the as‐prepared hierarchical Fe/Fe3O4@C microtubes exhibit remarkable MA performance with a maximum refection loss of −55.4 dB and an absorption bandwidth of 4.2 GHz. Therefore, in this study, the authors not only demonstrate a synergistic strategy to design multilevel hollow architecture, but also provide a fundamental guide in heterointerface engineering of highly efficient electromagnetic functional materials.

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“…Bulk solid materials with macrostructures, such as foams 12,13 and aerogels, 14,15 which can be applied as a free-standing EMW absorbing and EMI shielding materials, are seen as a potential strategy for the development of new-type lightweight absorbers with versatility by addressing the poor durability of composites without subsequent steps and improving the poor cohesion of conventional composites. 16 So far, graphene-based aerogel as a representative of lightweight multifunctional EMW absorbing and EMI shielding materials with three-dimensional (3D) porous structure has achieved high intensity broadband absorption, which has been applied in complex environments because of its excellent high hydrophobicity, heat insulation, anti-frosting, and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Marine polysaccharide-based electromagnetic absorbing/shielding materials: design principles, structure, and properties

Wang

Xiao

et al. 2022

J. Mater. Chem. A

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Multifunctional carbon foam with hollow microspheres and a concave–convex microstructure for adjustable electromagnetic wave absorption and wearable applications

Abstract: The unique C-rGO/Fe3O4 carbon foam with hollow microsphere and concave–convex microstructure had excellent EMW absorption performance with smart function-tunable feature, also showing potential application for monitoring humans’ physiological signal.

Cited by 27 publications

References 32 publications

Recent advance in three-dimensional porous carbon materials for electromagnetic wave absorption

Recent advance in three-dimensional porous carbon materials for electromagnetic wave absorption

Customizing Heterointerfaces in Multilevel Hollow Architecture Constructed by Magnetic Spindle Arrays Using the Polymerizing‐Etching Strategy for Boosting Microwave Absorption

Marine polysaccharide-based electromagnetic absorbing/shielding materials: design principles, structure, and properties

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