Green Synthesis of Uniform Magnetite (Fe3O4) Nanoparticles and Micron Cubes
Green Synthesis of Uniform Magnetite (Fe3O4) Nanoparticles and Micron Cubes
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均匀磁铁矿（Fe3O4）纳米粒子和微米立方体的绿色合成
DOI：
10.1166/jnn.2012.5684
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发表时间：
2012-03-01
影响因子：
--
通讯作者：
He, Nongyue
中科院分区：
文献类型：
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作者：
Li, Xiaolong;Zhang, Fengqin;He, Nongyue
以Fe 3+、Fe 2+和H2 O2为原料，采用绿色水热法制备了单晶Fe 3 O 4微立方体。利用X射线衍射仪（XRD）、透射电子显微镜（TEM）和扫描电子显微镜（SEM）对样品的结构和形貌进行了表征。在中性条件下，用H_2O_2氧化Fe ~（3+）和Fe ~（2+），合成了平均直径为3 μ m的磁铁矿（Fe_3O_4）立方体。通过对比实验研究了Fe 3+、Fe 2+和H2 O2对产物形貌的影响。H_2O_2氧化Fe ~（3+）和Fe ~（2+）分别得到不规则和椭球形的Fe_2O_3结构。同时，用NH 4 HCO 3和尿素分别取代H2 O2，得到了Fe 3 O 4纳米管和纳米粒子。结果表明，反应体系中的H2 O2、Fe 3+和Fe 2+对获得微米级立方状Fe 3 O 4起着关键作用。同时，通过控制反应参数，也可以制备出管状和其他形貌的纳米Fe_2O_3和Fe_3O_4粒子。
Single-crystalline Fe3O4 microcubes were obtained through a green hydrothermal procedure using Fe3+, Fe2+ and H2O2 as starting materials. The structures and morphologies of the as-prepared samples were characterized in detail by X-ray diffraction (XRD), Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) respectively. Magnetite (Fe3O4) cubes averaging 3 mu m in diameter were synthesized by H2O2 oxidation of Fe3+ and Fe2+ under neutral conditions. The contrastive experiments were designed to elucidate the effects of Fe3+, Fe2+ and H2O2 on the morphology of the final products. Irregular and ellipsoidal Fe2O3 structures were obtained by H2O2 oxidation of Fe3+ and Fe2+ respectively. Meanwhile, Fe3O4 nanotubes and nanoparticles were obtained when H2O2 was replaced by NH4HCO3 and urea respectively. The results show that H2O2, Fe3+ and Fe2+ in the reactive system play critical roles in obtaining micrometric cube-like Fe3O4. While, other nanometric Fe2O3 and Fe3O4 particles with tube-like and other morphologies could also be developed by controlling the reaction parameters.