Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 13, Pages 11333-11342Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00965
Keywords
electromagnetic interference; Co-C core shell structure; reflection loss; interfacial polarization; impedance match
Funding
- National Natural Science Foundation of China [51373096, U1733130]
- Basic Research Field of Shanghai Science and Technology Innovation Program [16JC1401500]
- Medicine-Engineering Crossover Foundation of Shanghai Jiao Tong University [YG2016M570]
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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 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.
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