Porous Co-C Core-Shell Nanocomposites Derived from Co-MOF-74 with Enhanced Electromagnetic Wave Absorption Performance
Porous Co-C Core-Shell Nanocomposites Derived from Co-MOF-74 with Enhanced Electromagnetic Wave Absorption Performance
复制标题
Co-MOF-74 衍生的多孔 Co-C 核壳纳米复合材料具有增强的电磁波吸收性能
DOI：
10.1021/acsami.8b00965
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发表时间：
2018-04-04
影响因子：
9.5
通讯作者：
Liu, Hezhou
中科院分区：
文献类型：
--
作者：
Wang, Kaifeng;Chen, Yujie;Liu, Hezhou
碳材料和铁氧体材料的结合近年来引起了人们对微波吸收应用的兴趣。本文以钴金属有机骨架（Co-MOF-74）为前驱体，通过易烧结工艺合成了一种将钴芯封装在多孔碳壳中的新型复合材料。由于钴芯产生的磁损耗和具有独特多孔结构的碳壳产生的介电损耗，再加上两组分之间的界面极化，使铁磁复合材料比传统铁氧体材料表现出更强的电磁波吸收性能。当热分解温度为800℃时，在11.85 GHz时，最优反射损耗值达到-62.12 dB，厚度较薄（2.4 mm），带宽范围为4.1 ~ 18 GHz，可吸收90%以上的微波。所取得的性能表明，所制备的多孔Co-C核壳复合材料作为一种有效的微波吸收剂具有相当大的潜力。
The combination of carbon materials and ferrite materials has recently attracted increased interest in microwave absorption applications. Herein, a novel composite with cobalt cores encapsulated in a porous carbon shell was synthesized via a facile sintering process with a cobaltic metal-organic framework (Co-MOF-74) as the precursor. Because of the magnetic loss caused by the Co cores and dielectric loss caused by the carbon shell with a unique porous structure, together with the interfacial polarization between two components, the ferromagnetic composite exhibited enhanced electromagnetic wave absorption performance compared to traditional ferrite materials. With the thermal decomposition temperature of 800 degrees C, the optimal reflection loss value achieved -62.12 dB at 11.85 GHz with thin thickness (2.4 mm), and the bandwidth ranged from 4.1 to 18 GHz with more than 90% of the microwave that could be absorbed. The achieved performance illustrates that the as-prepared porous Co-C core shell composite shows considerable potential as an effective microwave absorber.