Controlled synthesis of porous Fe3O4-decorated graphene with extraordinary electromagnetic wave absorption properties
Controlled synthesis of porous Fe3O4-decorated graphene with extraordinary electromagnetic wave absorption properties
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DOI：
10.1016/j.actamat.2013.06.030
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发表时间：
2013-09
期刊：
影响因子：
9.4
通讯作者：
Danping Sun;Quan Zou;Guoqiang Qian;Chen-Nan Sun;Wei Jiang;Feng-sheng Li
中科院分区：
文献类型：
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作者：
Danping Sun;Quan Zou;Guoqiang Qian;Chen-Nan Sun;Wei Jiang;Feng-sheng Li
采用改进的两步法成功制备了具有不同微观结构的多孔Fe 3 O 4修饰石墨烯（GN-Fe 3 O 4）复合材料。通过X射线衍射（XRD）、透射电子显微镜和扫描电子显微镜对样品的微观结构和形貌进行了表征。XRD研究表明，产物由高度结晶的Fe_3O_4和无序堆叠的GN片层组成。电子显微镜图像显示，不同尺寸和微观结构的Fe 3 O 4纳米粒子均匀地包覆在GN片的两面，没有大的空位或明显的聚集现象。含30 wt.%环氧树脂的电磁波吸收性能在室温下，在0.5-18 GHz的频率范围内研究了GN-Fe_3 O_4复合材料。特别是，多孔的，花状的Fe 3 O 4装饰GN样品表现出增强的介电损耗由于多孔的微观结构的Fe 3 O 4。复合材料具有多种吸波机理，其阻抗匹配性得到改善，有望成为轻质电磁波吸收材料。
Porous Fe3O4-decorated graphene (GN–Fe3O4) composites with different microstructures were successfully synthesized by a modified two-step method. The microstructure and morphology were confirmed by X-ray diffraction (XRD), transmission electron microscopy and scanning electron microscopy. XRD studies show that the products consist of highly crystallized Fe3O4but disorderedly stacked GN sheets. Electron microscopy images reveal that Fe3O4nanoparticles with different sizes and microstructures are uniformly coated on both sides of GN sheets, without large vacancies or apparent aggregation. Electromagnetic wave absorption properties of epoxy containing 30 wt.% GN–Fe3O4composites were investigated at room temperature in the frequency range of 0.5–18 GHz. In particular, the porous, flower-like Fe3O4-decorated GN sample exhibits an enhanced dielectric loss due to the porous microstructure of Fe3O4. The multiple absorbing mechanisms attribute to the improved impedance matching which indicates the as-prepared porous GN–Fe3O4composites could be a potential candidate for lightweight electromagnetic wave absorption materials.