Abstract
In this study, multiwalled carbon nanotube (MWCNT) anchored on the surface of silica coated porous rodlike nickel ferrite (NiFe2O4@SiO2) composite was fabricated, and its structure, composition, magnetic and electromagnetic (EM) wave absorption properties were studied. High-performance EM wave absorption properties of the ternary composite can be regulated by the coating thickness and the content of the absorber. The reflection loss (RL) was optimized to −67.8 dB at the matching thickness of 1.9 mm, and the effective absorption bandwidth (RL ≤ −10 dB) was 4.5 GHz (13.5–18 GHz) at the coating thickness of only 1.5 mm with the filler loading 40 wt%. The effective bandwidth can reach 5.3 GHz (12.7–18 GHz) at the coating thickness of only 2.2 mm with the filler loading 30 wt%. The broadband absorption, thin thickness, strong absorption and adjustable absorption properties endow NiFe2O4@SiO2/MWCNT composite with extensive prospects for EM wave absorption.
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