Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 287, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2022.126308
Keywords
Co-C@C nanocomposites; Tubular structure; Cobalt phthalocyanine; Polydopamine; Electromagnetic wave absorption
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Funding
- Natural Science Foundation of Jiangsu Province [BK20190413, BK20210616]
- National Defense Technology Innovation Special Zone Spark Project [2016300TS00911901]
- China Postdoctoral Science Foundation [2019M661825]
- Jiangsu Key Laboratory of Electrochemical Energy-Storage Technologies [EEST2021-2]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- National Natural Science Foundation of China [52171180, 51802154]
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The cobalt@carbon nanocomposites with a porous tubular structure exhibit excellent electromagnetic wave absorption performance due to their large specific surface area and abundant porosity. The Co-N bond on the surface of cobalt nanoparticles enhances the absorption performance.
The metal-carbon nanocomposites are widely applied to electromagnetic wave (EMW) absorption due to their good impedance matching characteristics and multiple attenuation mechanisms. Here, the cobalt@carbon (Co-C@C) composites with the porous tubular structure were prepared by calcining the polydopamine (PDA) coated porphyrin derivative cobalt phthalocyanine (CoPc). The heating temperature has a significant effect on the morphology, porosity, magnetization intensity, and EMW absorption performance. These results show that Co-C@C composites after heat treatment temperature at 800 C have the best EMW absorption performance because of their large specific surface area, abundant mesopores and macropores, and high magnetization. Meanwhile, the Co-N bond could generate at the surface of cobalt nanoparticles, resulting in an interfacial effect and enhancing polarization loss. The minimum reflection loss (RLmin) is-47.36 dB at 12.76 GHz and the effective absorption bandwidth (EAB) is 5 GHz. In addition, Co-C@C composites can be used as tunable EMW absorbers with superior performance.
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