Engineering defects in 2D g-C<sub>3</sub>N<sub>4</sub> for wideband, efficient electromagnetic absorption at elevated temperature

Lv, Hualiang; Zhou, Xiaodi; Wu, Guanglei; Kara, Ufuoma I.; Wang, Xiaoguang

doi:10.1039/d1ta02785a

Cited by 133 publications

(26 citation statements)

References 62 publications

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“…The measurements for conductivity of samples in literatures are direct four‐probe measurement and indirect from EIS and UV–vis DRS measurement. [ 135 , 136 , 137 ] EIS test is widely used in electrochemistry to verify the conductivity of samples. According to the equivalent circuit and semicircle in EIS plot, a smaller semicircle means lower electrical resistivity and higher conductivity.…”

Section: Dielectric Loss Mechanismsmentioning

confidence: 99%

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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Electromagnetic (EM) wave absorbing materials play an increasingly important role in modern society for their multi-functional in military stealth and incoming 5G smart era. Dielectric loss EM wave absorbers and underlying loss mechanism investigation are of great significance to unveil EM wave attenuation behaviors of materials and guide novel dielectric loss materials design. However, current researches focus more on materials synthesis rather than in-depth mechanism study. Herein, comprehensive views toward dielectric loss mechanisms including interfacial polarization, dipolar polarization, conductive loss, and defect-induced polarization are provided. Particularly, some misunderstandings and ambiguous concepts for each mechanism are highlighted. Besides, in-depth dielectric loss study and novel dielectric loss mechanisms are emphasized. Moreover, new dielectric loss mechanism regulation strategies instead of regular components compositing are summarized to provide inspiring thoughts toward simple and effective EM wave attenuation behavior modulation.

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Section: Dielectric Loss Mechanismsmentioning

confidence: 99%

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

2022

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“…In order to make better prevention of EMW, EMW-absorbing materials that can attenuate EMW energy and convert incident EMW into heat or otherwise forms of energy have been designed and developed [6,7]. The idealized absorbing material should meet the requirement of wide bandwidth, light weight and thin thickness [8][9][10]. However, the EMW absorption capacity of a single material is relatively weak.…”

Section: Introductionmentioning

confidence: 99%

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

et al. 2021

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Layered double hydroxides (LDHs) have a special structure and atom composition, which are expected to be an excellent electromagnetic wave (EMW) absorber. However, it is still a problem that obtaining excellent EMW-absorbing materials from LDHs. Herein, we designed heterostructure NiCo-LDHs@ZnO nanorod and then subsequent heat treating to derive NiCo@C/ZnO composites. Finally, with the synergy of excellent dielectric loss and magnetic loss, an outstanding absorption performance could be achieved with the reflection loss of − 60.97 dB at the matching thickness of 2.3 mm, and the widest absorption bandwidth of 6.08 GHz was realized at 2.0 mm. Moreover, this research work provides a reference for the development and utilization of LDHs materials in the field of microwave absorption materials and can also provide ideas for the design of layered structural absorbers.

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“…Recently, carbon-based materials, which can be categorized into materials with a high degree of graphitization (e.g., graphene, metallic carbon nanotubes (CNTs), and graphite) and moderate/low degree of graphitization [20][21][22], have attracted significant attention for their use as EM absorbers based on four main reasons. First, carbon materials are naturally resistant to acidic mediums due to the strong covalent bonds between the carbon atoms [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Biomass-Derived Carbon Heterostructures Enable Environmentally Adaptive Wideband Electromagnetic Wave Absorbers

et al. 2021

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Although advances in wireless technologies such as miniature and wearable electronics have improved the quality of our lives, the ubiquitous use of electronics comes at the expense of increased exposure to electromagnetic (EM) radiation. Up to date, extensive efforts have been made to develop high-performance EM absorbers based on synthetic materials. However, the design of an EM absorber with both exceptional EM dissipation ability and good environmental adaptability remains a substantial challenge. Here, we report the design of a class of carbon heterostructures via hierarchical assembly of graphitized lignocellulose derived from bamboo. Specifically, the assemblies of nanofibers and nanosheets behave as a nanometer-sized antenna, which results in an enhancement of the conductive loss. In addition, we show that the composition of cellulose and lignin in the precursor significantly influences the shape of the assembly and the formation of covalent bonds, which affect the dielectric response-ability and the surface hydrophobicity (the apparent contact angle of water can reach 135°). Finally, we demonstrate that the obtained carbon heterostructure maintains its wideband EM absorption with an effective absorption frequency ranging from 12.5 to 16.7 GHz under conditions that simulate the real-world environment, including exposure to rainwater with slightly acidic/alkaline pH values. Overall, the advances reported in this work provide new design principles for the synthesis of high-performance EM absorbers that can find practical applications in real-world environments.

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Engineering defects in 2D g-C₃N₄ for wideband, efficient electromagnetic absorption at elevated temperature

Abstract: Metal-free 2D nanomaterials such as graphitic carbon nitride (g-C3N4) nanosheets have attracted enormous attention due to their ultralow mass density, excellent chemical stability, high specific surface area, unique electronic structure...

Cited by 133 publications

References 62 publications

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Biomass-Derived Carbon Heterostructures Enable Environmentally Adaptive Wideband Electromagnetic Wave Absorbers

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Engineering defects in 2D g-C3N4 for wideband, efficient electromagnetic absorption at elevated temperature

Abstract: Metal-free 2D nanomaterials such as graphitic carbon nitride (g-C3N4) nanosheets have attracted enormous attention due to their ultralow mass density, excellent chemical stability, high specific surface area, unique electronic structure...

Cited by 133 publications

References 62 publications

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Dielectric Loss Mechanism in Electromagnetic Wave Absorbing Materials

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Biomass-Derived Carbon Heterostructures Enable Environmentally Adaptive Wideband Electromagnetic Wave Absorbers

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Engineering defects in 2D g-C₃N₄ for wideband, efficient electromagnetic absorption at elevated temperature