文章基本信息

标题：Microstructure induced dielectric loss in lightweight Fe 3O 4 foam for electromagnetic wave absorption
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作者：Qing Chang ; Hongsheng Liang ; Bin Shi 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2022
卷号：25
期号：3
页码：1-16
DOI：10.1016/j.isci.2022.103925
语种：English
出版社：Elsevier
摘要：SummaryFe3O4has been extensively applied in electromagnetic wave absorption field profiting from its advantageous magnetic loss, low cost and environmental benignity. Nevertheless, the inherent drawbacks of high density, low permittivity and easily magnetic aggregation are still the obstacles for pristine Fe3O4becoming ideal absorbents. To overcome such limitations, a design mentality of constructing 3D structure shaped by curled 2D porous surface is proposed in this study. 3D structure overcomes the easy-agglomeration issue of 2D materials and meanwhile maintains their conductivity. The complex permittivity of samples is regulated by adjusting the microstructure of Fe3O4to achieve optimum impedance matching. Defect induced polarization and interfacial polarization are the main loss mechanisms. Impressively, the density of S0.5 is only 0.05078 g/cm3and the effective absorption bandwidth is up to 6.24 GHz (11.76-18 GHz) at 1.8 mm. This work provided a new insight for structurally improving the EMW absorption performance of pure magnetic materials.Graphical abstractDisplay OmittedHighlights•Fe3O4foams with 3D structure shaped by folding of 2D curved surface were prepared•Effect of microstructure on conductivity and EMW absorbing property was investigated•Lightweight (0.05078 g/cm3) and broad bandwidth absorption (6.24 GHz) were achievedPhysics; Electrodynamics