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Metal-organic polymer coordination materials derived Co/N-doped porous carbon composites for frequency-selective microwave absorption
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-09-03 , DOI: 10.1016/j.compositesb.2020.108406
Panbo Liu , Sai Gao , Yi Wang , Fengtao Zhou , Ying Huang , Juhua Luo

Structure design and composition control are two crucial factors in determining the microwave absorption performance for absorbers, however, it still possess formidable challenges to balance the dual coordination between them. Herein, a coordination assembly strategy is used to synthesize Co2+-organic polymer coordination materials, then, Co/N-doped porous carbon (Co/NPC) composites, in which Co particles encapsulated in the interior framework of N-doped porous carbon, are obtained by a high-temperature treatment. The increase of the pyrolysis temperature promotes the enhancement of specific surface area while leads to lower N heteroatoms and the agglomeration of Co particles, resulting in adjusted microwave absorption intensity and bandwidth with frequency-selectivity. Balancing the promoted impedance matching, the synergetic effects between dielectric/magnetic components and multiple reflection/scattering, the Co/NPC-800 composites display the strongest microwave absorption intensity with a minimum reflection loss of −65.1 dB at 2.5 mm while an effective bandwidth (<-10 dB) of 9.4 GHz can be achieved for Co/NPC-700 composites with a thickness of 3.2 mm. The synthesized Co/NPC composites with large specific surface area, lower filler loading and excellent microwave absorption possess a potential application in lightweight absorbers and this strategy provides a new paradigm for the design of microwave absorption materials derived from metal-organic polymer coordination composites.



中文翻译:

金属-有机聚合物配位材料衍生的Co / N掺杂多孔碳复合材料,用于频率选择性微波吸收

结构设计和成分控制是决定吸收器微波吸收性能的两个关键因素,然而,平衡它们之间的双重配合仍然面临着巨大的挑战。在此,使用协调组装策略合成Co 2+-有机聚合物配位材料,然后,通过高温处理获得Co / N掺杂的多孔碳(Co / NPC)复合材料,其中Co颗粒封装在N掺杂的多孔碳的内部骨架中。热解温度的升高促进了比表面积的增加,同时导致较低的N杂原子和Co粒子的团聚,从而以频率选择性调整了微波吸收强度和带宽。Co / NPC-800复合材料平衡了促进的阻抗匹配,介电/磁性成分之间的协同效应以及多次反射/散射,在2.5 mm的波长下显示出最强的微波吸收强度,最小反射损耗为−65.1 dB,而有效带宽为( <-10 dB)的9。对于厚度为3.2毫米的Co / NPC-700复合材料,可以达到4 GHz。具有大的比表面积,较低的填料负载量和优异的微波吸收性的合成的Co / NPC复合材料在轻质吸收体中具有潜在的应用前景,该策略为设计由金属-有机聚合物配位复合物衍生的微波吸收材料提供了新的范例。

更新日期:2020-09-14
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