Open AccessPreparation of magnetic ferrocarbon matrix composites and study on their microwave dielectric properties
Author(s) -
Wenli Bao,
Wen Chen,
Zhenjun Si
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/508/1/012133
Subject(s) - materials science , carbon nanotube , microwave , dielectric loss , electromagnetic radiation , microstructure , dielectric , composite material , composite number , absorption (acoustics) , optoelectronics , optics , physics , quantum mechanics
Among many electromagnetic absorbing materials, carbon matrix composites are regarded as an ideal electromagnetic absorbing agent because of their advantages of low density, low cost and strong electromagnetic loss. It is generally believed that the properties of the electromagnetic absorbent are closely related to its composition and microstructure, but the understanding of the relevant mechanism needs to be further improved. Therefore, this paper studies a new ternary composite material HCNTs/Fe@Fe 3 O 4 , which is made of acidified carbon nanotubes (HCNTs) modified by magnetic core shell Fe@Fe 3 O 4 nanoparticles. The material has a variety of interface polarization and dipole loss forms, showing a good electromagnetic absorption capacity and impedance matching performance. The absorption band width of the electromagnetic absorber can reach 5.5 GHz at the thickness of 1.5 mm. The C o values of HCNTs/Fe-@Fe 3 O 4 and HCNTs/Fe-@Fe 2 O 3 samples with strong antioxidant capacity fluctuated with the change of frequency, indicating that the eddy current loss had a weak magnetic loss on the samples. Thus, it can be inferred that the changed C o value also indirectly proves that the magnetic loss of the sample may come from natural resonance.