Wen Bo, Yang Haibo, Lin Ying, Ma Liang, Qiu Yun, Hu Fanfan
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
J Colloid Interface Sci. 2021 Mar 15;586:208-218. doi: 10.1016/j.jcis.2020.10.085. Epub 2020 Oct 26.
Absorbents with good impedance matching and outstanding loss capacity are of great significance in the field of electromagnetic wave absorption. Herein, S, Co co-doped porous carbon nanosheets (SCN) were synthesized via the pyrolysis of metal organic frameworks. By adjusting the ratio of metal ions to ligands, the microstructures of the SCN composites are changed. As an efficient absorbent, the porous SCN-16 composite displays superior electromagnetic wave absorption performance. The minimun reflection loss (RL) is -54.5 dB at 15.6 GHz with a thickness of 2.2 mm. The efficient absorption bandwidth is 6.88 GHz. The doped Co nanoparticles and porous carbon were produced to provide magnetic-dielectric synergetic effect and heterogeneous interfaces, thereby improving their impedance. Besides, the doped S further generates more dipole polarization loss to enhance electromagnetic wave absorption. Therefore, this work not only provide an advanced strategy for the regulation of heterogeneous interfaces of SCN composites, but also induce a novel avenue to synthesize the S, Co co-doped porous carbon for the improved impedance matching and outstanding electromagnetic wave absorption.
具有良好阻抗匹配和出色损耗能力的吸波材料在电磁波吸收领域具有重要意义。在此，通过金属有机框架的热解合成了硫、钴共掺杂的多孔碳纳米片（SCN）。通过调整金属离子与配体的比例，改变了SCN复合材料的微观结构。作为一种高效吸波材料，多孔SCN-16复合材料表现出优异的电磁波吸收性能。在厚度为2.2毫米时，15.6吉赫兹下的最小反射损耗（RL）为-54.5分贝。有效吸收带宽为6.88吉赫兹。掺杂的钴纳米颗粒和多孔碳产生了磁电协同效应和异质界面，从而改善了它们的阻抗。此外，掺杂的硫进一步产生更多的偶极极化损耗以增强电磁波吸收。因此，这项工作不仅为调控SCN复合材料的异质界面提供了一种先进策略，还为合成用于改善阻抗匹配和出色电磁波吸收的硫、钴共掺杂多孔碳开辟了一条新途径。
