Interface modulation of chiral PPy/Fe3O4 planar microhelixes to achieve electric/magnetic-coupling and wide-band microwave absorption

Yang, Xin; Fan, Baoxin; Tang, Xi; Wang, Jinglin; Tong, Guoxiu; Chen, DaBo; Guan, Jianguo

doi:10.1016/j.cej.2021.132747

Cited by 51 publications

(37 citation statements)

References 83 publications

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Section: Resultsmentioning

confidence: 99%

“…[36] It can be generalized that better absorption performance always accompanied with higher tanδ ε , indicating that the EMW absorption was mainly attributed to the dielectric loss. [37] In this case, three kinds of heterogeneous structure models can be built to analyze corresponding polarization performance according to traditional polarization theory. As is illustrated in Figure 2i schematically, the MoS 2 with S vacancy, Cu@ MoS 2 , and C@MoS 2 formed typical point-point (Mo-vacancy [S]), point-face (Cu-MoS 2 ), and face-face (carbon-MoS 2 ) heterojunctions, respectively.…”

Section: According To the Free Electron Theorymentioning

confidence: 99%

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Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

Gao

Lan

et al. 2022

Adv Funct Materials

158

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Given tunable hybridization structures in solid solutions, fascinating electromagnetic (EM) properties can be achieved for regulating EM wave (EMW) absorption. Herein, a novel metal–organic cooperative interactions method is proposed to manipulate the vacancy, interstitial, substitutional, and heterointerface structures in molybdenum disulfide (MoS2) solid solution simultaneously, thence meeting the synergistic polarization loss on various point and face sites. Assisted by the coordination between Cu2+ and polydopamine (PDA), the effect of Cu modification on MoS2 is highly improved, which further lead to polarization loss on S vacancy, interstitial Cu, substitutional N, and heterointerface between carbon and MoS2. Contributing to the synergetic effect among multiple polarizations, the Cu/C@MoS2 solid solution exhibit ultrahigh EMW absorption performance, of which EMA with twice PDA delivers the effective absorption bandwidth of 7.12 GHz and minimum reflection loss of −48.22 dB (2.5 mm). The energy attenuation of Cu/C@MoS2 improved almost 266.7% and 222.2% than C@MoS2 and Cu@MoS2, respectively. Finally, this work reveals the structural dependency of solid solution materials of EMW absorption and establishes an entirely new polarization loss model.

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Section: Resultsmentioning

confidence: 99%

Section: According To the Free Electron Theorymentioning

confidence: 99%

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

Gao

Lan

et al. 2022

Adv Funct Materials

158

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“…The attenuation constant ( α ) is used to measure the microwave dissipation ability within the MAMs, which relies on the dielectric loss and magnetic loss capacity. Equation 14 is the calculation formula of attenuation constant [ 75 – 79 ]. It can be discovered that the attenuation constant was enlarged with the enhancement of dielectric loss and magnetic loss.…”

Section: Mechanism Of Microwave Absorptionmentioning

confidence: 99%

State of the Art and Prospects in Metal-Organic Framework-Derived Microwave Absorption Materials

et al. 2022

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Microwave has been widely used in many fields, including communication, medical treatment and military industry; however, the corresponding generated radiations have been novel hazardous sources of pollution threating human’s daily life. Therefore, designing high-performance microwave absorption materials (MAMs) has become an indispensable requirement. Recently, metal–organic frameworks (MOFs) have been considered as one of the most ideal precursor candidates of MAMs because of their tunable structure, high porosity and large specific surface area. Usually, MOF-derived MAMs exhibit excellent electrical conductivity, good magnetism and sufficient defects and interfaces, providing obvious merits in both impedance matching and microwave loss. In this review, the recent research progresses on MOF-derived MAMs were profoundly reviewed, including the categories of MOFs and MOF composites precursors, design principles, preparation methods and the relationship between mechanisms of microwave absorption and microstructures of MAMs. Finally, the current challenges and prospects for future opportunities of MOF-derived MAMs are also discussed."Image missing"

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“…Wideband absorbers are commonly used to realize EM protection, which has also been comprehensively investigated using the ideas of frequency selective surface (FSS), metasurface, and also novel materials. [9][10][11][12][13][14][15][16][17] EM protection products using these methods have been gradually commercialized due to the relatively simple structures.However, the lack of frequency-selective property makes it impossible for these methods to transmit useful electromagnetic signals while realizing EM protection. For instance, for military applications, the communication signal of an antenna or radar should be able to pass through the radome while the waves at adjacent bands should be absorbed to reduce the total RCS.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

All‐Fabric Flexible Frequency‐Selective‐Rasorber Based on Cutting‐Transfer Patterning Method

Chen

Peng

et al. 2022

Adv Materials Inter

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due to its significance in both the health of lives and the normal operation of electronic devices. Till now, researchers have done fruitful research on EM protection, mainly including EM shielding and EM absorption. [1] Traditional metalbased materials are the most common EM shielding materials. Recently, electrically conductive polymer composite, [2,3] graphene, [4,5] MXene, [6,7] and also fabric or textile materials [8,9] are explored to realize efficient EM shielding. The EM principle lies in the use of high electrical conductivity materials to reflect electromagnetic noise, thus blocking its direct exposure to the organism. Compared to EM shielding, EM absorption is not only a barrier to the transmission of electromagnetic noise but also a way of absorbing it, avoiding secondary contamination by the reflected electromagnetic waves. Wideband absorbers are commonly used to realize EM protection, which has also been comprehensively investigated using the ideas of frequency selective surface (FSS), metasurface, and also novel materials. [9][10][11][12][13][14][15][16][17] EM protection products using these methods have been gradually commercialized due to the relatively simple structures.However, the lack of frequency-selective property makes it impossible for these methods to transmit useful electromagnetic signals while realizing EM protection. For instance, for military applications, the communication signal of an antenna or radar should be able to pass through the radome while the waves at adjacent bands should be absorbed to reduce the total RCS. For civil applications, in the bedroom or pregnant women's ward, the EM pollution should be blocked by the means of absorption or reflection, while the cell phone signals should be transmitted normally to ensure the quality of communication. Under such circumstances, either traditional EM shielding or EM absorbing is disabled to realize frequency-selective EM protection.Frequency selective rasorber (FSR), a new structure combining FSS and absorber, has been proposed and studied in recent years. These works have important positive significance for frequency selective EM protection. [18][19][20][21][22][23][24][25] Most of the existing FSRs use rigid substrates and a large number of lumped devices, resulting in drawbacks such as heavyweight, high complexity, and inflexibility. Recent works have more or less Frequency-selective rasorber (FSR) can realize a passband between two adjacent absorption bands, which is essential in many electromagnetic scenarios such as antennas and cloaking technologies. However, the current printed circuit board (PCB)-based FSR has shortcomings such as being heavy, rigid, and complex structure (too many lumped elements), making it a long distance from practical military and civil applications. Here, a novel FSR comprised of carbon cloth/ copper cloth/ fabric hybrid structure is proposed to realize the function of frequency selective absorption for the application of indoor electromagnetic protection. Several sub-subjects are studied, inclu...

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Interface modulation of chiral PPy/Fe3O4 planar microhelixes to achieve electric/magnetic-coupling and wide-band microwave absorption

Cited by 51 publications

References 83 publications

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

State of the Art and Prospects in Metal-Organic Framework-Derived Microwave Absorption Materials

All‐Fabric Flexible Frequency‐Selective‐Rasorber Based on Cutting‐Transfer Patterning Method

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Interface modulation of chiral PPy/Fe3O4 planar microhelixes to achieve electric/magnetic-coupling and wide-band microwave absorption

Cited by 51 publications

References 83 publications

Synergistic Polarization Loss of MoS2‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

Synergistic Polarization Loss of MoS2‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

State of the Art and Prospects in Metal-Organic Framework-Derived Microwave Absorption Materials

All‐Fabric Flexible Frequency‐Selective‐Rasorber Based on Cutting‐Transfer Patterning Method

Contact Info

Product

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About

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption