络合法制备均匀γ-Fe2O3纳米颗粒@多层石墨烯复合材料研究

采用水热反应中的金属离子络合一步制备均匀超细磁性γ-Fe₂O₃纳米颗粒@多层石墨烯复合材料, 无需对石墨烯进行氧化处理。采用超声法制备多层石墨烯作为基片, 制备方法简单, 石墨烯表面的含氧官能团少。以FeCl₂为反应物, 以DMF(N, N二甲基甲酰胺)和水混合液作为溶剂, 其中DMF能起到络合金属离子的作用。实验研究了乙酸钠、反应温度及填充度对制备产物的影响。采用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)对复合材料进行微结构分析, 采用振动样品磁强计(VSM)测试了复合材料的磁性能。研究结果表明: 利用亚铁离子与DMF形成的络合物与碳环的π-π吸附作用可以在多层石墨烯表面生成铁氧化物。通过控制亚铁离子的氧化速度和氧化铁的生长速度, 在多层石墨烯表面获得了尺寸小于10 nm的均匀γ-Fe₂O₃纳米颗粒, 复合材料具有良好的磁性能。

Preparation of Uniform Magnetic Fe2O3 Nanoparticles@multi-layer Graphene Composites with Complexation Method

One-step hydrothermal reaction and complexation method was used to prepare the extra uniform γ-Fe₂O₃ nanoparticles@multi-layer graphene, which was unnecessary to introduce oxygen function group on graphene. Multi-layer graphene was prepared by simple sonication method that will not introduce rich oxygen functional groups on its surface. Reagent FeCl₂, mixture solvent DMF and water were used for hydrothermal reaction, in which DMF could form complexion with metal ion. The effects of sodium acetate, reaction temperature and filling ratio on the prepared product were studied. X-ray diffraction(XRD), X-ray photoelectron spectroscope(XPS), scanning electron microscope (SEM), and transmission electron microscope (TEM) were used to analyze the microstructures of the composite materials. The magnetic properties of the composites were measured by vibrating sample magnetometer (VSM). The results show that π-π reaction between carbon ring and complexation of Fe²⁺ with DMF can be used to prepare iron oxide on the multi-layer graphene. Homogeneous γ-Fe₂O₃ nanoparticles with size less than 10 nm can be prepared through the control of oxidation speed of Fe²⁺ and growth velocity of iron oxide, with good magnetic properties.