Zhang Chongyang, Liu Zhi, Xu Pan, Zhang Ying, Yue Xigui
Alan G. MacDiarmid Institute, Jilin University, 2699 Qianjin Street, Changchun 130012, People's Republic of China.
Science and Technology on Advanced Functional Composites Laboratory, Aerospace Research Institute of Material and Processing Technology, Beijing 100076, People's Republic of China.
Nanotechnology. 2021 May 14;32(20):205707. doi: 10.1088/1361-6528/abe3b8.
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.
随着电子设备和无线通信工具的迅速发展，设计和制造低成本、轻质且有效的电磁吸收材料以解决电磁波干扰问题变得迫在眉睫。在此，设计了一种制备多孔碳/石墨纳米片/铁磁纳米颗粒（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）掺入多孔聚酰亚胺中，并添加铁作为磁性颗粒源和调节孔径的试剂。获得了一系列PC/GNS/Fe复合吸收剂。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，由相分离过程产生的分级多孔结构得到了很好的保留。结果表明，结晶碳的存在会影响反射损耗值和频率范围。因此，通过调节材料的孔结构和结晶碳含量可以优化吸收性能，这有利于获得具有优异综合性能的电磁波吸收材料。
