Shell Thickness-Dependent Microwave Absorption of Core–Shell Fe 3 O 4 @C Composites
Harbin Institute of Technology
Indexed incrossrefpubmed
Abstract
Core-shell composites, Fe3O4@C, with 500 nm Fe3O4 microspheres as cores have been successfully prepared through in situ polymerization of phenolic resin on the Fe3O4 surface and subsequent high-temperature carbonization. The thickness of carbon shell, from 20 to 70 nm, can be well controlled by modulating the weight ratio of resorcinol and Fe3O4 microspheres. Carbothermic reduction has not been triggered at present conditions, thus the crystalline phase and magnetic property of Fe3O4 micropsheres can be well preserved during the carbonization process. Although carbon shells display amorphous nature, Raman spectra reveal that the presence of Fe3O4 micropsheres can promote their graphitization degree to a…
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7Topics & keywords
Topics
Keywords
- Materials science
- Composite material
- Reflection loss
- Carbonization
- Microwave
- In situ polymerization
- Dielectric
- Dielectric loss
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