Microwave absorbing properties of iron nanowire at x-band frequencies

Abstract

Iron nanowires and nanoparticles are fabricated via the reduction of iron salts (FeCl3•6H2O) with or without a parallel magnetic field, respectively. Polyvinyl pyrrolidone was added during the reduction process and formed a thin passive layer to minimize the oxidation. The as-obtained iron nanomaterials were then used as magnetic fillers, added to an epoxy resin, and iron nanoparticle or nanowire composites were prepared. The complex permittivity (ɛ' – jɛ") and permeability (μ' – jμ") of these composites are measured by a cavity perturbation method from 7 to 14 GHz. The iron nanowire composites exhibited superior microwaving absorbing properties compared to iron nanoparticle composites. The optimal absorption peak of iron nanowire composites reached −10.5 dB (>90% power absorption) and −15.5 dB (>97% power absorption) with a thickness of 2 and 3 mm, respectively.

Structural and magnetic properties of iron nanowires and iron nanoparticles fabricated through a reduction reaction

“…Fabrication of Fe NWs and Fe NPs: Iron nanowires as well as iron nanoparticles have been prepared in a similar manner as described in [3,12,15,35–36]. Therefore, the fabrication procedures are described briefly here.…”

Broadband Dielectric Properties of Fe2O3·H2O Nanorods/Epoxy Resin Composites

“…This choice was due to the fact that the permittivity of composites below the percolation threshold at room temperature is almost frequency-independent and its value is close to pure epoxy resin permittivity [17,20]. In microwave frequency range, the value of complex dielectric permittivity is very similar to the corresponding properties of epoxy resin composites filled with iron nanowires and nanoparticles [11].…”

“…Then, these particles can also be applied in such areas as magnetic resonance imaging, tissue engineering, and drug delivery and also as hyperthermia agents [10]. Particularly, nanowires, nanorods, and others are interesting composites with high aspect ratio magnetic particles [11,12]. However, investigations of polymeric composites with goethite (Fe 2 O 3 •H 2 O) nanorods are very rare enough [13].…”

Significantly high electromagnetic shielding effectiveness in polypyrrole synthesized by eco‐friendly and cost‐effective technique

“…Intrinsically conducting polymers such as polythiophene (PTH), poly-P-phenylene-benzobisthiazole (PBT), polypyrrole (PPy), and polyaniline (PANI) have been effective shielding materials on account of tunable electrical conductivity, low cost, corrosion resistance, easy processability, and mechanical flexibility. [11][12][13][14][15] They have large scope in military and satellite applications due to their EMI shielding phenomenon based on absorption mechanism. [16][17][18][19][20][21][22] Polypyrrole usage in EMI shielding applications is widespread because of pertaining high electrical conductivity, good thermal and environmental stability, low toxicity, and ease of synthesis in aqueous solvent.…”

“…[16][17][18][19][20][21][22] Polypyrrole usage in EMI shielding applications is widespread because of pertaining high electrical conductivity, good thermal and environmental stability, low toxicity, and ease of synthesis in aqueous solvent. [23][24][25][26] There are very few literatures available on polypyrrole and its composites for EMI shielding in Xband (8)(9)(10)(11)(12). X-band in the electromagnetic spectrum has a major role in radar sub-bands for military, government and civil institutions, terrestrial broadband, space communications, and wireless computer networks.…”