Abstract
In order to manufacture microwave absorbers with strong attenuation abilities and that are light weight, in this paper, ferromagnetic carbon matrix composites were prepared by the composite of carbon nanotubes with adjustable dielectric constant and Fe3O4. Fe3O4/MWCNT composites with well-designed necklace-like structure and controllable size in the range of 100–400 nm have been successfully achieved by a simple solvent thermal method. A series of samples were prepared by changing experimental parameters. The microwave absorption characteristics of these samples were studied from the dielectric constant and magnetic permeability in two aspects. The electromagnetic absorption properties of the composites show obvious differences with different microsphere sizes, different microsphere density and different proportion of additives. When the solvothermal time is 15 h and the microsphere size is 400 nm, the reflection loss reaches −38 dB. The interfacial polarization caused by the unique structural design and good impedance matching produce composites that possess excellent electromagnetic loss ability.
Highlights
Carbon nanotubes-based composites materials have been widely accepted as microwave absorbers due to their inherent features such as low density and good conductivity.they have received the extensive attention of researchers from various fields in recent years [1,2,3,4]
Carbon nanotubes are fully dispersed in ethylene glycol (EG) solution, and a large number of carboxyl groups on the side walls of MWCNT can adsorb Fe3+ ions in the FeCl3 solution through static electricity and bind firmly
Fe3 O4 nanocrystals contribute to their directional aggregation
Summary
Carbon nanotubes-based composites materials have been widely accepted as microwave absorbers due to their inherent features such as low density and good conductivity. They have received the extensive attention of researchers from various fields in recent years [1,2,3,4]. Due to the intrinsic strong conductivity of carbon nanotubes [14,15,16,17], the real and imaginary parts of their complex permittivity are very large, but it is difficult to match with the free space, resulting in the electromagnetic wave not being able to enter the absorbent body but is instead reflected on its surface [18,19]. At the same time, adding magnetic material can enhance the magnetic loss of the composite to the electromagnetic wave and improve the efficiency of microwave absorbing
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