材料期刊网

采用水热法，以三氯化铁为铁源，以聚乙烯吡咯酮（ PVP）和十六烷基三甲基溴化铵（ CTAB）为表面活性剂，合成了α-Fe2 O3纳米棒和纳米立方体，并用X-射线衍射仪（ XRD）、扫描电子显微镜（ SEM）和磁学测量系统（ SQUID-VSM）对其进行了表征。结果：以PVP为表面活性剂所制备的α-Fe2 O3纳米材料为平均直径约为70 nm，长度约300 nm纳米棒，以CTAB为表面活性剂所制备的α-Fe2 O3纳米材料为边长700 nm的准立方体，而不加表面活性剂所制备的样品的为无形貌的氧化铁纳米材料；其室温磁化强度和矫顽力分别为Mr 0．07 emu／g， Hc 2300 Oe；Mr 0．2 emu／g， Hc 3600 Oe；Mr 0．15 emu／g， Hc 3100 Oe。结论：表面活性剂对样品的形貌和磁性具有重要影响。

Different morphology α-Fe2 O3 nanomaterials were successfully prepared by a facile hydrothermal method with PVP and CTAB as surfactant .The as obtained products were characterized by X-ray diffraction (XRD), scanning electron microscope ( SEM) and magneto-meter ( SQUID-VSM) . The α-Fe2 O3 nanorods and nanocubes can be obtained when used PVP and CTAB as surfactant , respectively , but none-morphology α-Fe2 O3 nanomaterials were synthesized without any surfactant .The results show that the nanorods are 70 nm in diameter and 300 nm in length;the nanocubes are 700 nm in sides.The magnetic investigation shows that the synthesized α-Fe2 O3 nanorod, nanocubes and none-morphology nanomaterials exhibit ferromagnetic property with Mr and Hc 0.07 emu/g, 2300 Oe; 0.2 emu/g, 3600 Oe;0.15 emu/g, 3100 Oe respectively, at room temperature.