Hollow cube-like CuS derived from Cu<sub>2</sub>O crystals for the highly efficient elimination of electromagnetic pollution

Sun, Xiaodong; Yuan, Xin; Li, Xiaopeng; Li, Ling; Song, Quanjun; Lv, Xuliang; Gu, Guangxin; Sui, Mingxu

doi:10.1039/c8nj00488a

Cited by 27 publications

(22 citation statements)

References 51 publications

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“…To investigate the EMW absorption properties of the NiS 2 @rGO/PPy composite with different doping ratios, the measured complex permittivity and permeability were used to calculate the reflection loss values of the as-prepared composites by the following equation [43]:Zin=Z0tanhμrεr[μrεr(2πfdc)j] RL=20log|Zin−Z0Zin+Z0| where Z in is the input characteristic impedance, Z 0 ≈ 378 Ω is the free space of impedance matching, ƒ is the frequency of EMW, c is the velocity of light in a vacuum, d is the thickness of the composites, and ε r and μ r are the complex permittivity and permeability, respectively. When the reflection loss value is lower than −10, −20 and −30 dB, more than 90%, 99%, and 99.9% of the EM energy is absorbed, respectively [44].…”

Section: Resultsmentioning

confidence: 99%

NiS2@rGO Nanosheet Wrapped with PPy Aerogel: A Sandwich-Like Structured Composite for Excellent Microwave Absorption

Zhang

Chen

et al. 2019

Nanomaterials

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To reduce electromagnetic pollution as well as increase the accuracy of high-precision electronic equipment, more attention has been paid to new electromagnetic wave (EMW) absorbing materials, which have the advantages of strong absorption, wide absorption bands, and a narrow thickness. In this study, a novel ternary type of the NiS2@rGO/polypyrrole (PPy) sandwich-like structured composites was synthesized via a facile two-step method, in which the hydrothermal method was used to prepare NiS2@rGO binary composites and then the in situ polymerization method was used to synthesize the PPy, which acted as the outer layer of the sandwich-like structure. The morphologies and electromagnetic absorption performance of the NiS2@rGO/PPy were measured and investigated. A sample with 6 wt% NiS2@rGO/PPy loading paraffin-composite obtained an outstanding reflection loss (RL) of −58.7 dB at 16.44 GHz under a thickness of 2.03 mm. Simultaneously, the effective electromagnetic wave absorption bandwidth for RL < −10 dB, which covered 7.04 to 18.00 GHz (10.96 GHz), was achieved by changing the thickness of the absorber from 2.0 to 3.5 mm. The results not only suggest that the NiS2@rGO/PPy composite has excellent performance in the field of EMW absorption but also prove that the novel sandwich-like structure can contribute to appropriate impedance matching through multiple relaxation and interfacial polarization processes.

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Section: Resultsmentioning

confidence: 99%

NiS2@rGO Nanosheet Wrapped with PPy Aerogel: A Sandwich-Like Structured Composite for Excellent Microwave Absorption

Zhang

Chen

et al. 2019

Nanomaterials

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“…Excessive electromagnetic radiation will not only affect the stable operation of precision electronic equipment but also harm the health of organisms [ 1 , 2 ]. Amid the current complex electromagnetic environment, research on high-efficiency, lightweight and broadband electromagnetic wave absorbing materials has become high in the advanced functional material industry [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

NiMnO3 Anchored on Reduced Graphene Oxide Nanosheets: A New High-Performance Microwave Absorbing Material

et al. 2022

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With the increasing influence of electromagnetic radiation on precision instruments and organisms, there is an urgent need for research on lightweight and high-strength electromagnetic wave absorbing materials. This study has probed into a new composite absorbing material based on reduced graphene oxide (rGO)-NiMnO3, where the like-core-shell NiMnO3 is anchored on the rGO nanosheets to significantly improve the electromagnetic wave dissipation ability of the composite material using the inter-component dipole polarization and interface polarization. At the same time, NiMnO3 can effectively adjust the impedance matching ratio of rGO so that electromagnetic waves can effectively enter the absorbing material. At a thickness of 3.73 mm, the maximum absorption strength of rGO-NiMnO3 reaches −61.4 dB at 6.6 GHz; at a thickness of 2.5 mm, the adequate absorption bandwidth is 10.04–18.00 GHz, achieving a full coverage for the Ku band. As a new option for preparing lightweight and broadband electromagnetic wave absorbing materials, rGO-NiMnO3 is an ideal material for electromagnetic wave protection.

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“…Various structures, such as nanowires, − cubes, − core–shell, − yolk–shell, − etc., have been applied to improve electromagnetic characteristics for high MA performance. Among all the reported structures related to MA, the yolk–shell structure exhibits considerable potential and competitiveness due to multiscattering dissipations, complementary ability, and interfacial polarization.…”

Section: Introductionmentioning

confidence: 99%

C/MnO@void@C with Triple Balances for Superior Microwave Absorption Performance

Zhang

Qian

et al. 2021

ACS Appl. Mater. Interfaces

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It is very promising and challenging to construct a yolk–shell structure with highly efficient microwave absorption (MA) performance through a simple fabrication process. Here, a novel C/MnO@void@C (MCC) yolk–shell structure has been successfully synthesized by one-step calcination without additional processing. The as-obtained MCC composites with tunable crystallinity degrees and hollowness can be obtained by treatment at various temperatures. The MCC composites treated at 700 °C (MCC-700) show an impressive MA performance, and the optimal reflection loss of −53.2 dB and an effective absorption bandwidth of 5.4 GHz can be obtained. This excellent performance results from multiple balance mechanisms. First, the regulated permittivity of MCC-700 due to proper crystallinity and hollowness is beneficial for the balance between dielectric loss (tan δε) and impedance match (Z im). Second, the optimal balance between the increasing polarization range and decreasing polarization intensity can be achieved, which is favorable for the improvement of the MA performance. Third, the multicore yolk–shell structure of MCC-700 is conducive to multiple scattering and continuous energy dissipation. Thus, our new findings provide a rational way for the utilization of yolk–shell structural manganese-based materials.

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Hollow cube-like CuS derived from Cu₂O crystals for the highly efficient elimination of electromagnetic pollution

Abstract: In this study, hollow cube-like CuS was fabricated via a one-step reaction to investigate high electromagnetic wave absorption performance.

Cited by 27 publications

References 51 publications

NiS2@rGO Nanosheet Wrapped with PPy Aerogel: A Sandwich-Like Structured Composite for Excellent Microwave Absorption

NiS2@rGO Nanosheet Wrapped with PPy Aerogel: A Sandwich-Like Structured Composite for Excellent Microwave Absorption

NiMnO3 Anchored on Reduced Graphene Oxide Nanosheets: A New High-Performance Microwave Absorbing Material

C/MnO@void@C with Triple Balances for Superior Microwave Absorption Performance

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Hollow cube-like CuS derived from Cu2O crystals for the highly efficient elimination of electromagnetic pollution

Abstract: In this study, hollow cube-like CuS was fabricated via a one-step reaction to investigate high electromagnetic wave absorption performance.

Cited by 27 publications

References 51 publications

NiS2@rGO Nanosheet Wrapped with PPy Aerogel: A Sandwich-Like Structured Composite for Excellent Microwave Absorption

NiS2@rGO Nanosheet Wrapped with PPy Aerogel: A Sandwich-Like Structured Composite for Excellent Microwave Absorption

NiMnO3 Anchored on Reduced Graphene Oxide Nanosheets: A New High-Performance Microwave Absorbing Material

C/MnO@void@C with Triple Balances for Superior Microwave Absorption Performance

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Hollow cube-like CuS derived from Cu₂O crystals for the highly efficient elimination of electromagnetic pollution