1D Magnetic Materials of Fe₃O₄ and Fe with High Performance of Microwave Absorption Fabricated by Electrospinning Method

摘要

Fe₃O₄ and Fe nanowires are successfully fabricated by electrospinning method and reduction process. Wiry microstructures were achieved with the phase transformation from α-Fe₂O₃ to Fe₃O₄ and Fe by partial and full reduction, while still preserving the wire morphology. The diameters of the Fe₃O₄ and Fe nanowires are approximately 50–60?nm and 30–40?nm, respectively. The investigation of microwave absorption reveals that the Fe₃O₄ nanowires exhibit excellent microwave absorbing properties. For paraffin-based composite containing 50% weight concentration of Fe₃O₄ nanowires, the minimum reflection loss reaches ?17.2?dB at 6.2?GHz with the matching thickness of 5.5?mm. Furthermore, the calculation shows that the modulus of the ratio between the complex permittivity and permeability |ε/μ| is far away from unity at the minimum reflection loss point, which is quite different from the traditional opinions.