摘要:
为改善石墨烯的吸波效果,将石墨烯与磁性粒子复合,并对其电磁性能进行研究。以氧化石墨和FeCl3·6H2O为原料,采用溶剂热法制备RGO@Fe3O4复合物;采用X射线衍射、扫描电镜等手段对材料的结构和Fe3O4的分布状态进行测试表征;将RGO@Fe3O4复合物与乙烯基树脂复合,采用同轴法测定了材料在0.5~18 GHz频率范围内的复介电常数和复磁导率,解释了复合物的介电损耗和磁损耗形式。按照传输线理论计算了材料的吸波效果,结果表明,RGO@Fe3O4复合物的吸波效果明显优于Fe3O4;随FeCl3·6H2O添加量的增大,材料的有效吸波带宽变大,2 mm时材料的有效吸波带宽最大可达1.8 GHz;调节FeCl3·6H2O的添加量和材料厚度,材料的最小反射损耗可以达到-44.2 dB。
Abstract:
To improve the electromagnetic wave absorption performance of graphene, the electromagnetic properties of RGO@Fe3O4 nanoparticle composites have been researched. RGO@Fe3O4 composites was prepared in a solvothermal system by reduction reaction between FeCl3·6 H2O and ethylene glycol in the presence of GO. SEM and XRD were used to characterize the structure of the composite and the distribution of Fe3O4. Vector network analyzer was used to measure the complex permittivity and complex permeability of the composite in the frequence range of 0.5~18 GHz. By the transmission line theory, the reflection loss was calculated. The results showed that the electromagnetic wave absorption performance of RGO@Fe3O4 composites was much better than that of Fe3O4; that with the increase of addition of FeCl3·6 H2O, the effective absorption bandwidth was broadened, and the maximal bandwidth could reach 1.8 GHz; that by changing the content of FeCl3·6 H2O and the thickness of material, minimum reflection loss could be as low as-44.2 dB.
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