Hierarchically porous carbon derived from natural Porphyra for excellent electromagnetic wave absorption

Luo, Juhua; Dai, Ziyang; Feng, Mengna; Chen, Xiaowen; Sun, Chen; Xu, Ying

doi:10.1016/j.jmst.2022.04.047

Cited by 100 publications

(19 citation statements)

References 43 publications

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“…According to the above results, the RL min absorption peaks shift to the low frequency with increasing thicknesses, which can use the explanation of λ /4 cancellation theory [ 55 , 56 ]. …”

Section: Resultsmentioning

confidence: 82%

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

et al. 2022

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Developing ultrabroad radar-infrared compatible stealth materials has turned into a research hotspot, which is still a problem to be solved. Herein, the copper sulfide wrapped by reduced graphene oxide to obtain three-dimensional (3D) porous network composite aerogels (CuS@rGO) were synthesized via thermal reduction ways (hydrothermal, ascorbic acid reduction) and freeze-drying strategy. It was discovered that the phase components (rGO and CuS phases) and micro/nano structure (microporous and nanosheet) were well-modified by modulating the additive amounts of CuS and changing the reduction ways, which resulted in the variation of the pore structure, defects, complex permittivity, microwave absorption, radar cross section (RCS) reduction value and infrared (IR) emissivity. Notably, the obtained CuS@rGO aerogels with a single dielectric loss type can achieve an ultrabroad bandwidth of 8.44 GHz at 2.8 mm with the low filler content of 6 wt% by a hydrothermal method. Besides, the composite aerogel via the ascorbic acid reduction realizes the minimum reflection loss (RLmin) of − 60.3 dB with the lower filler content of 2 wt%. The RCS reduction value can reach 53.3 dB m2, which effectively reduces the probability of the target being detected by the radar detector. Furthermore, the laminated porous architecture and multicomponent endowed composite aerogels with thermal insulation and IR stealth versatility. Thus, this work offers a facile method to design and develop porous rGO-based composite aerogel absorbers with radar-IR compatible stealth.

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Section: Resultsmentioning

confidence: 82%

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

et al. 2022

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“…In the MnO 2 /Ti 3 C 2 T x /RGO composite aerogel, dielectric loss plays a major role in EM wave attenuation, while magnetic loss can be ignored because of the dielectric property of the composite aerogel and the lack of magnetic composition. Dielectric loss includes conductivity loss and polarization loss, and polarization loss is divided into interfacial polarization and dipolar polarization. − Therefore, the conductivity loss and polarization loss, which constitute the dielectric loss, play a very important role in EM wave attenuation. The detailed microwave absorption mechanisms of the MnO 2 /Ti 3 C 2 T x /RGO ternary composite aerogel are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Ultralight Hierarchically Structured RGO Composite Aerogels Embedded with MnO₂/Ti₃C₂T_x for Efficient Microwave Absorption

et al. 2022

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Although intensive efforts have been devoted to fabricating Ti3C2T x MXene composites for microwave absorption, it remains a great challenge to achieve excellent MA performance at low loading and thin thickness. Herein, a three-dimensional (3D) lightweight hierarchically structured MnO2/Ti3C2T x /RGO composite aerogel with abundant heterointerfaces was fabricated via a hydrothermal and chemical reduction self-assembly method. The RGO aerogel embedded with laminated MnO2/Ti3C2T x provides a lot of heterogeneous interfaces, 3D porous interconnected conductive networks, and reasonable combination of various loss materials for rich interfacial polarization, conductivity loss, multiple reflections and scattering, and good impedance matching. Benefiting from the synergy of different loss mechanisms, the maximum reflection loss (RL) is up to −66.5 dB (>99.9999% energy absorption) at only 10 wt % loading and 2.0 mm thickness, and even at only 1.5 mm thickness, the maximum RL value remains at −36 dB (>99.9% energy absorption). The work provides a promising route to construct 3D hierarchically heterogeneous composite aerogels for efficient MA at thin thickness and low loading.

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“…Carbon-based materials are considered a promising candidate because of their ultra-low density, high specic surface area, excellent environmental stability, and a wide variety of rich sources. [5][6][7][8] Thereinto, two-dimensional (2D) carbon-based materials have received extensive attention in EMW absorption due to their excellent properties such as adjustable layer spacing, large interfaces, and easy construction of diversity networks. [9][10][11][12] For example, Su et al 13 prepared sandwich-shaped NiCo 2 O 4 /graphite nanosheets and obtained a maximum reection loss of À47.01 dB with an effective absorption bandwidth (EAB) of 2.98 GHz.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon-based materials are considered a promising candidate because of their ultra-low density, high specific surface area, excellent environmental stability, and a wide variety of rich sources. 5–8…”

Section: Introductionmentioning

confidence: 99%

Wave-transparent LAS enabling superior bandwidth electromagnetic wave absorption of a 2D pitaya carbon slice

Ding

et al. 2022

J. Mater. Chem. A

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Hierarchically porous carbon derived from natural Porphyra for excellent electromagnetic wave absorption

Cited by 100 publications

References 43 publications

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Ultralight Hierarchically Structured RGO Composite Aerogels Embedded with MnO₂/Ti₃C₂T_x for Efficient Microwave Absorption

Wave-transparent LAS enabling superior bandwidth electromagnetic wave absorption of a 2D pitaya carbon slice

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Hierarchically porous carbon derived from natural Porphyra for excellent electromagnetic wave absorption

Cited by 100 publications

References 43 publications

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Ultralight Hierarchically Structured RGO Composite Aerogels Embedded with MnO2/Ti3C2Tx for Efficient Microwave Absorption

Wave-transparent LAS enabling superior bandwidth electromagnetic wave absorption of a 2D pitaya carbon slice

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Ultralight Hierarchically Structured RGO Composite Aerogels Embedded with MnO₂/Ti₃C₂T_x for Efficient Microwave Absorption