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Porous Co–C Core–Shell Nanocomposites Derived from Co-MOF-74 with Enhanced Electromagnetic Wave Absorption Performance
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-03-13 00:00:00 , DOI: 10.1021/acsami.8b00965 Kaifeng Wang 1 , Yujie Chen 1 , Ran Tian 1 , Hua Li 1 , Ying Zhou 1 , Huanan Duan 1 , Hezhou Liu 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-03-13 00:00:00 , DOI: 10.1021/acsami.8b00965 Kaifeng Wang 1 , Yujie Chen 1 , Ran Tian 1 , Hua Li 1 , Ying Zhou 1 , Huanan Duan 1 , Hezhou Liu 1
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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 °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.
中文翻译：
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
碳材料和铁氧体材料的组合最近在微波吸收应用中引起了越来越多的兴趣。在此，以钴金属-有机骨架（Co-MOF-74）为前体，通过简便的烧结工艺合成了一种将钴核包裹在多孔碳壳中的新型复合材料。由于由Co核引起的磁损耗和由具有独特多孔结构的碳壳引起的介电损耗，以及两个组件之间的界面极化，与传统的铁氧体材料相比，铁磁复合材料表现出增强的电磁波吸收性能。在800°C的热分解温度下，在11.85 GHz处具有较薄的厚度（2.4 mm）时，最佳反射损耗值达到了-62.12 dB，带宽为4。1至18 GHz，可吸收超过90％的微波。所取得的性能表明，所制备的多孔Co-C核-壳复合材料作为有效的微波吸收剂具有巨大的潜力。
更新日期：2018-03-13
中文翻译：
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
碳材料和铁氧体材料的组合最近在微波吸收应用中引起了越来越多的兴趣。在此，以钴金属-有机骨架（Co-MOF-74）为前体，通过简便的烧结工艺合成了一种将钴核包裹在多孔碳壳中的新型复合材料。由于由Co核引起的磁损耗和由具有独特多孔结构的碳壳引起的介电损耗，以及两个组件之间的界面极化，与传统的铁氧体材料相比，铁磁复合材料表现出增强的电磁波吸收性能。在800°C的热分解温度下，在11.85 GHz处具有较薄的厚度（2.4 mm）时，最佳反射损耗值达到了-62.12 dB，带宽为4。1至18 GHz，可吸收超过90％的微波。所取得的性能表明，所制备的多孔Co-C核-壳复合材料作为有效的微波吸收剂具有巨大的潜力。
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