Porous carbon materials for microwave absorption

Cheng, Jin-Bo; Shi, Haigang; Cao, Min; Wang, Ting; Zhao, Haibo; Wang, Yu‐Zhong

doi:10.1039/d0ma00662a

Cited by 70 publications

(23 citation statements)

References 132 publications

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“…The percentage of SE A in SE T was up to 80.6%, suggesting the dominant role of microwave absorption in the EMI-shielding process, which avoided effectively the secondary EMI pollution resulting from the microwave reflection. More importantly, the combination of absorption-dominant EMI shielding and thermal infrared stealth can achieve multiple stealths, thereby effectively protecting military targets from multiple detection methods of infrared thermal induction and radar. − …”

Section: Resultsmentioning

confidence: 99%

Multifunctional Flame-Retardant Melamine-Based Hybrid Foam for Infrared Stealth, Thermal Insulation, and Electromagnetic Interference Shielding

Shi

Zhao

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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104

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Multifunctionalization is an important development direction of electromagnetic interference (EMI)-shielding materials. However, it is still a huge challenge to effectively integrate multiple functions into materials. Herein, we reported a facile method to fabricate multifunctional EMI-shielding materials, which were assembled with multidimensional components consisting of a 3D melamine–formaldehyde (MF) foam skeleton, 0D ferroferric oxide (Fe3O4) nanoparticles, and 1D silver nanowires (AgNWs) via coprecipitation and dip-coating processes. Due to the coaction of conductive AgNWs and magnetic Fe3O4 nanoparticles, the resultant hybrid foam showed excellent absorption-dominant EMI-shielding performances with a high specific EMI-shielding effectiveness value of 12,704 dB cm2 g–1. Moreover, thanks to the multilayer porous micro-/nanostructure and the nonflammability of functional coatings, the hybrid foam shows excellent flame retardancy and heat insulation, making it attractive for the functions of infrared stealth and heat insulation. The corresponding mechanism is discussed in detail. Combined with the advantages of high thermal insulation, flame retardancy, elasticity, and excellent absorption-dominant EMI-shielding performances, the hybrid foam showed great applications in the fields of both military and civilian. This work provides new inspiration and insights for the design of multifunctional high-performance EMI-absorbing materials.

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Section: Resultsmentioning

confidence: 99%

Multifunctional Flame-Retardant Melamine-Based Hybrid Foam for Infrared Stealth, Thermal Insulation, and Electromagnetic Interference Shielding

Shi

Zhao

Liu

et al. 2021

ACS Appl. Mater. Interfaces

Self Cite

104

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“… 35 The PC materials have been reported and applied in the field of catalysis, supercapacitor and the microwave absorption, due to the high specific areas, tunable pore sizes and unique structures. 36 However, pure PC materials commonly exhibit the single loss mechanism, which cannot show the better absorption capacity. One of the common methods is to blend PC materials with the magnetic loss materials, increasing the complex permeability to satisfy the impedance matching.…”

Section: Mof-derived Pc Materialsmentioning

confidence: 99%

Recent progress of MOF-derived porous carbon materials for microwave absorption

Tong

et al. 2021

RSC Adv.

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“…Case It is often said in the literature [3][4][5][6][7][8][9][10] that absorption in foamed composites is favoured by multiple reflections of the microwave signal between walls, so that the signal is trapped in each cell, which maximises the interactions with conductive walls wherein the signal is dissipated then absorbed. If this is true, the behaviour of the signal in each cell is close to that of a resonator.…”

Section: Sample Compositementioning

confidence: 99%

“…Indeed, the presence of air in the cell of the foam helps to reduce the reflection of the signal incoming to the composite and contributes also to reduce its weight. Moreover, some authors [3][4][5][6][7][8][9][10] claim that the microwave absorption in foamed composites is enhanced compared to that in solid composite, due to multiple reflections/scatterings of the microwave signal on the walls of the foam's cell. However, no experimental nor theoretical development in the literature confirms this statement, to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Microwave Absorption Mechanisms in Microcellular Foamed Conductive Composites

Huynen

2021

Micro

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The paper investigates the mechanisms of microwave absorption in microcellular foamed conductive composites dedicated to protection against electromagnetic interferences (EMI). A multi-layered electromagnetic one-dimensional (1D) model mimicking the microcellular foam structure is built and validated using previous measurements carried out on various fabricated composite foams. Our model enables us to perform a parametric analysis of the absorption behaviour in a foamed composite, using as parameters the size of the hollow cell, the thickness of the cell’s walls and its conductivity, as well as the overall thickness of the composite and the frequency. Our investigations demonstrate that multiple reflections of the microwave signal between the cellular walls are not the main mechanism responsible for absorption, although they are often reported as a cause of enhanced absorption in the literature. On the contrary, our work demonstrates that the enhancement of the absorption observed in foamed conductive composite compared to unfoamed composite is mainly due to the presence of air in the microcells of the composite.

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Porous carbon materials for microwave absorption

Abstract: With the widespread use of microwaves in the civil and military fields, lots of efforts have been made to design high-performance microwave absorption (MA) materials, that should possess thin coating...

Cited by 70 publications

References 132 publications

Multifunctional Flame-Retardant Melamine-Based Hybrid Foam for Infrared Stealth, Thermal Insulation, and Electromagnetic Interference Shielding

Multifunctional Flame-Retardant Melamine-Based Hybrid Foam for Infrared Stealth, Thermal Insulation, and Electromagnetic Interference Shielding

Recent progress of MOF-derived porous carbon materials for microwave absorption

Investigation of Microwave Absorption Mechanisms in Microcellular Foamed Conductive Composites

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