Zhiqian Yao, Yuxin Liu, Yong Zhang, Xueru Zhang, Yunfei Wu, Jiewu Cui, Jiaheng Wang, Yan Wang, Jiaqin Liu and Yucheng Wu
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引用次数: 0
摘要
当代无线设备使用的频谱主要位于 L-C 波段,因此解决这些范围内的电磁波(EMW)污染问题已成为一项重要的研究挑战。本研究结合水热法和球磨法合成了片状羰基铁粉/二硫化钼(FCIP/MoS2)复合材料。MoS2 的引入不仅在很大程度上优化了样品的阻抗匹配,而且只需稍微调整 MoS2 的含量,就能使复合材料的电磁波吸收从 X 波段调整到 L 波段。特别是,经过优化的 FCIP/MoS2 复合材料在厚度为 3.09 mm 时的最小反射损耗(RLmin)达到了令人印象深刻的 -54.86 dB,吸收带宽横跨 55.5% 的 S 波段。此外,还阐明了增强和调制波吸收性能的内在机理。理论模拟显示,复合材料的最大雷达散射截面(RCS)值可降低约 29 dB m2,显示出卓越的吸波性能。这项研究提出了一种制备高效可调电磁波吸收体的新方法,它可能在 5G 技术、新能源汽车以及军事应用中大有可为。
Engineering flaky carbonyl iron/MoS2 composites with tuned and broadband absorption towards low-frequency electromagnetic waves
The contemporary frequency spectrum utilized by wireless devices predominantly resides in the L–C bands, thus addressing electromagnetic wave (EMW) pollution within these ranges has emerged as a critical research challenge. In this study, flaky carbonyl iron powder/molybdenum disulfide (FCIP/MoS2) composites were synthesized through a combination of hydrothermal and ball milling techniques. The introduction of MoS2 not only optimizes the impedance matching of the samples to a great extent, but also allows the composite to adjust its EMW absorption from the X-band to the L-band with only a slight adjustment of the MoS2 content. Particularly, the optimized FCIP/MoS2 composites demonstrated an impressive minimum reflection loss (RLmin) of −54.86 dB at a thickness of 3.09 mm with the absorption bandwidth spanning 55.5% of the S-band. Furthermore, the underlying mechanism of the enhanced and modulated wave absorption performance was elucidated. Theoretical simulations revealed that the maximum radar scattering cross-section (RCS) value of the composite can be reduced by approximately 29 dB m2, revealing exceptional wave absorption performance. This investigation presents a novel approach to the preparation of highly efficient tunable EMW absorbers which may find great potential in 5G technology, new energy vehicles as well as military applications.
期刊介绍:
The Journal of Materials Chemistry is divided into three distinct sections, A, B, and C, each catering to specific applications of the materials under study:
Journal of Materials Chemistry A focuses primarily on materials intended for applications in energy and sustainability.
Journal of Materials Chemistry B specializes in materials designed for applications in biology and medicine.
Journal of Materials Chemistry C is dedicated to materials suitable for applications in optical, magnetic, and electronic devices.
Example topic areas within the scope of Journal of Materials Chemistry C are listed below. This list is neither exhaustive nor exclusive.
Bioelectronics
Conductors
Detectors
Dielectrics
Displays
Ferroelectrics
Lasers
LEDs
Lighting
Liquid crystals
Memory
Metamaterials
Multiferroics
Photonics
Photovoltaics
Semiconductors
Sensors
Single molecule conductors
Spintronics
Superconductors
Thermoelectrics
Topological insulators
Transistors