Microwave Absorption Performance of Encapsulated Magnetic Particles With Nitrogen-Doped Carbon Nanotubes Fe3O4@NCNTs
One-dimensional carbon nanotubes(CNTs)have made them candidate as lightweight broadband microwave absorption material due to their intrinsic high electrical conductivity,light weight,and high specific surface area etc.In this paper,heterostructures of magnetic particels of iron oxide en-capsulated with nitrogen-doped carbon nanotubes(Fe3O4@NCNTs)have been successfully constructed in-situ by one-step pyrolysis process.The phase composition and structure of the composites were char-acterized by powder X-ray diffraction(XRD),Raman spectroscopy,scanning electron microscopy(SEM)and transmission electron microscopy(TEM),respectively.The electromagnetic parameters were mea-sured by coaxial method and the reflection loss was simulated by Matlab.The results show that the calci-nation temperatures and the raw material ratio have important effect on the microwave absorption proper-ties of nitrogen-doped magnetic functionalized carbon nanotube composites.The results demonstrated that when the calcination temperature was 750℃ and the raw material ratio(metal salt/carbon source)is 2∶1,the Fe3O4@NCNTs-750 hybrids with only 10% of functional fillers reached a minimum reflection loss val-ue of-57.7 dB and a maximum effective absorption bandwidth(EAB,below-10 dB)of 6.4 GHz at 2.0 mm.
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