Enhanced electromagnetic wave absorption properties of Fe nanowires in gigaherz range

Abstract

Fe nanowires with 70–200nm in diameter and 20–50μm in length were synthesized by a chemical vapor deposition method for electromagnetic wave absorption application. The frequency dependences of relative permittivity (εr) and permeability (μr) were strongly dependent on the diameter of Fe wires. Compared with micrometer wires or flakelike samples, nanowires exhibited a magnetic resonance (μr″) peak in the range of 1–18GHz, suggesting that nanowires have significant effect for reducing the eddy current loss, therefore, the resin compacts of 29vol% Fe nanowires with thicknesses of 1.3–4.0mm provided good electromagnetic wave absorption performances in the range of 5.6–18GHz.

Effect of liquid-solid ratio on the morphology, structure, conductivity, and electromagnetic characteristics of iron particles

“…Moreover, the aforesaid result is more excellent than those reported in literature, i.e. Fe-Cr-Si-Al alloy flakes [11], Fe flakes [12,13], and Co nameplates [ 2 0]. The enhanced broadband absorption properties are attributed to the multi-resonance absorption and excellent electromagnetic properties of the flaked particles.…”

“…Wang et al [11] found that with the increase of the aspect ratio and size, the complex permittivity and permeability of Fe-Cr-Si-Al alloy flakes rose and the matching properties declined. At present, the literatures reported mainly focus on the alloy flakes and there is only a little literature about flaked iron [12,13]. Furthermore, the relationship between the microstructure and properties (e.g.…”

Synthesis and microwave absorption properties of FeCo nanoplates

“…FeCo composites, such as Y 2 O 3 /FeCo shell/core nanocomposites [8], Al 2 O 3 and C-coated FeCo nanocapsules [9,10], have been developed and an expected microwave absorption ability is obtained because of a better electromagnetic match. In addition, the microwave magnetic properties of the composites also depend on the morphology of magnetic materials [11,12]. Variety of microwave absorbers with different morphologies (Fe nanoparticles encapsulated in carbon nanotubes, Ni nanowires, etc.)…”

Enhanced Wave‐Absorption Properties of Nanocomposites Based on the Synthesized Bi2S3 Nanorods and Polyvinylidene Fluoride

“…Figure 4 shows the calculated theoretical RLs of the Bi 2 S 3 / paraffin nanocomposites with different loadings (10,20, and 40 wt %) and different thicknesses in the frequency range of 2-18 GHz. Since a paraffin matrix is transparent to microwaves, these results are generally regarded as the wave-absorption capacities of the filler itself (that is, Bi 2 S 3 in this study) for further comparison with other nanocomposites.…”