Carbon Fibers Embedded with Aligned Magnetic Particles for Efficient Electromagnetic Energy Absorption and Conversion
Carbon Fibers Embedded with Aligned Magnetic Particles for Efficient Electromagnetic Energy Absorption and Conversion
复制标题
嵌入对齐磁性颗粒的碳纤维可有效吸收和转换电磁能
DOI：
10.1021/acsami.0c20522
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发表时间：
2021
影响因子：
9.5
通讯作者：
Yu Ronghai
中科院分区：
文献类型：
--
作者：
Song Zhiming;Sun Xin;Li Ya;Tang Wukui;Liu Guiliang;Shui Jianglan;Liu Xiaofang;Yu Ronghai
从环境中获取电磁能并将其转化为有用的微能量是消除电磁辐射并为微电子设备提供电力的一种新的理想方法。这项技术的关键材料是宽带、超轻、超薄的电磁波吸收材料，其制备仍然具有挑战性。本文提出了一种强磁场(HMF)策略来制备生物质衍生CoFe/碳纤维(CoFe/CF)复合材料，其中CoFe磁性颗粒在CFs中排列，形成磁耦合和快速的电子传输通道。CFS的石墨化程度是通过CoFe颗粒在HMF作用下的“迁移催化”而提高的。HMF衍生的CoFe/CF在超轻和超薄条件下(1.5 mm)表现出极大的电磁波吸收带宽。与传统的随机分布的CoFe/CF相比，其吸收带宽增加了5-10倍，超过了已报道的类似物。基于HMF衍生的CoFe/CF膜，设计了一种电磁能量吸收和再利用的器件模型，该膜将EM能量转化为热能的能力比传统的CoFe/CF膜提高了300%。这项工作为宽带、超薄和超轻电磁波吸收材料的设计和制备提供了一种新的策略，并展示了一种潜在的废电磁能量转换方法。
Harvesting electromagnetic (EM) energy from the environment and converting it into useful micropower is a new and ideal way to eliminate EM radiation and while providing power for microelectronic devices. The key material of this technology is broadband, ultralight, and ultrathin EM-wave-absorbing materials, whose preparation remains challenging. Herein, a high magnetic field (HMF) strategy is proposed to prepare a biomass-derived CoFe/carbon fiber (CoFe/CF) composite, in which CoFe magnetic particles are aligned in CFs, creating magnetic coupling and fast electron transmission channels. The graphitization degree of CFs is improvedviathe “migration catalysis” of CoFe particles under HMF. The HMF-derived CoFe/CF shows a largely broadened EM wave absorption bandwidth under ultralight and ultrathin conditions (1.5 mm). Its absorption bandwidth increases 5–10 times compared with conventional CoFe/CF that has randomly distributed CoFe particles and surpasses the reported analogues. A device model for EM energy absorption and reuse is designed based on the HMF-derived CoFe/CF membrane, which exhibits a 300% higher capability than conventional CoFe/CF membrane in converting EM energy to thermal energy. This work offers a new strategy for the design and fabrication of broadband, ultrathin, and ultralight EM wave absorption materials and demonstrates a potential conversion approach of the waste EM energy.