材料科学
纳米复合材料
石墨烯
阻抗匹配
微观结构
复合材料
复合数
吸收(声学)
波长
电阻抗
电磁辐射
还原(数学)
光学
光电子学
纳米技术
物理
电气工程
工程类
数学
几何学
作者
Yingying Cai,Qi Sun,Liangling Sun,Xiaoyun Long,Tao Ji,Wei Ye
标识
DOI:10.1016/j.jmmm.2020.166656
摘要
Fe3O4-intercalated reduced graphene oxide (Fe3O4-rGO) nanocomposites were prepared by an in-situ reduction method. We studied the effect of preparation conditions, including GO:Fe3+ molar ratio and reduction temperature, on the structure and electromagnetic wave absorption properties of the nanocomposites. The Fe3O4-rGO nanocomposites have a typical sandwich structure at a 1:1 M ratio. Increasing the reduction temperature above 500 °C yielded a relatively pure Fe3O4 crystalline phase. Furthermore, changes in the microstructure effectively influence the matching performance of the material. A reasonable molar ratio and reduction temperature yields a composite with improved impedance matching and thickness matching characteristics. At a ratio of 1:1 and reduction temperature of 600 °C, the actual matching thickness of the material conforms to the quarter-wavelength theory, and the input impedance of the material matches the air impedance. As a result, electromagnetic waves enter the interior of the composite unhindered, where they can be effectively attenuated, thereby further improving the wave absorption properties of the material. When the thickness is 3 mm, the maximum reflectance at 8.6 GHz reaches −49.6 dB with an effective bandwidth of 2.72 GHz.
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