磁性多孔RGO@Ni复合材料的制备和吸波性能

Preparation and Microwave Absorption Properties of Magnetic Porous RGO@Ni Composites

以氧化石墨烯和乙酰丙酮镍为原料,用溶剂热法合成了三维多孔RGO@Ni纳米复合材料。采用X射线衍射(XRD)和X射线光电子能谱(XPS)表征了材料的晶体结构和组成,根据拉曼谱分析了材料内部的石墨化程度和结构缺陷,用扫描电镜(SEM)和透射电镜(TEM)观察了材料的形貌和微观结构。结果表明,当RGO@Ni纳米复合材料的填充量(质量分数)为25%时在最小反射损耗(RLmin)和最大有效吸收带宽(EAB)方面显示出优异的EMW吸收性能;厚度为2.2 mm的RGO@Ni纳米复合材料其RLmin为-61.2 dB,而在2.5 mm匹配厚度下覆盖的EAB范围最广,为6.6 GHz(10.5~17.1 GHz)。这种复合材料优异的微波吸收性能,归因于协同效应的增强和特殊的多孔结构。

An economic and green approach for the controllable synthesis of porous functionalized graphene materials as microwave absorbers was proposed in this paper. POROUS RGO@Ni nanocomposites were synthesized by a simple one-pot method based on solvothermal treatment of Ni(acac)2 and graphene oxide without adding additional reducing agents. The structure and morphology of the as-prepared hybrid materials were characterized by XRD, Raman spectroscopy, XPS, VSM, SEM and TEM.The results show that uniform Ni spheres of about 900 nm in diameter homogeneously distributed on graphene sheets and form a porous structure. The electromagnetic data demonstrated that RGO@Ni nanocomposites exhibited significantly excellent electromagnetic wave(EMW) absorption properties, probably originating from the unique 3 D porous structure and synergistic effect. The minimum reflection loss(RLmin) and maximum effective absorption bandwidth(EAB) of RGO@Ni nanocomposites are-61.2 dB and 6.6 GHz, respectively.