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10nm的均匀γ-Fe2O3纳米颗粒,复合材料具有良好的磁性能.
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