Abstract
Spherical Fe nanoparticles (FeNPs) with diameter of ∼100 nm were prepared by evaporating carbonyl iron particles (CIPs) using RF thermal plasma in a large scale. The FeNPs presented smooth surface, good dispersity and excellent antioxidation performance, which could be homogeneously distributed in paraffin with a particle loading as high as 90 wt%. In comparison to the raw CIPs, the FeNPs showed enhanced resonance characteristics in both permittivity and permeability due to the particle size effect. It was found that the FeNPs/paraffin composite exhibited excellent microwave absorption in terms of small matching thickness and broad bandwidth. The percentage bandwidth with reflection loss ≤−10 dB for the Fe nanocomposite is larger than that for the carbonyl iron composite at any specified thickness in the range of 1.0 ∼ 2.5 mm. This work demonstrates that the synthesized FeNPs hold great promise for developing thin-layered absorbers with excellent microwave absorbing performance.
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