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Porous carbon/graphite nanosheet/ferromagnetic nanoparticle composite absorbents with adjustable electromagnetic properties

机译：多孔碳/石墨纳米片/铁磁性纳米粒子复合吸收剂，具有可调节电磁特性

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摘要

With the rapid development of electronic devices and wireless communication tools, it is urgent to design and fabricate low-cost, lightweight and effective electromagnetic absorption materials to solve interference of electromagnetic waves. Herein, a new strategy toward porous carbon/graphite nanosheet/ferromagnetic nanoparticle (PC/GNS/Fe) composites was designed to investigate the influence of crystalline carbon on electromagnetic wave absorption. To begin with, graphite nanosheets (GNSs) were incorporated into the porous polyimide by in situ polymerization, and Fe were added as a magnetic particle source and an agent to regulate the pore size. A series of PC/GNS/Fe composite absorbents were obtained. The direct carbonization of porous polymer precursors was beneficial to the design of the pore structure of materials. A hierarchically porous structure derived from the phase separation process was well maintained in the polyimide pyrolysis process. The results demonstrated that the presence of crystalline carbon could influence the reflection loss value and the frequency range. Hence, the absorbing performance can be optimized by adjusting the pore structure and the content of crystalline carbon in materials, which is conducive to obtaining electromagnetic wave absorption materials with excellent comprehensive performance.
机译：随着电子设备和无线通信工具的快速发展，迫切需要设计和制造低成本、轻量化、高效的电磁吸收材料来解决电磁波的干扰。本文设计了一种多孔碳/石墨纳米片/铁磁性纳米颗粒（PC/GNS/Fe）复合材料的新策略，以研究结晶碳对电磁波吸收的影响。首先，通过原位聚合将石墨纳米片（GNSs）引入多孔聚酰亚胺中，并添加铁作为磁粉源和调节孔径的试剂。制备了一系列PC/GNS/Fe复合吸附剂。多孔聚合物前驱体的直接碳化有利于材料孔结构的设计。在聚酰亚胺热解过程中，相分离过程得到的层状多孔结构得到了很好的保持。结果表明，晶体碳的存在会影响反射损耗值和频率范围。因此，可以通过调整材料的孔结构和结晶碳含量来优化材料的吸波性能，这有利于获得综合性能优异的电磁波吸波材料。

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