Co3O4纳米花的合成及其磁性

通过水热和热处理的方法，制备了产物Co3O4纳米花. 用X射线粉末衍射、场发射扫锚电镜、透射电镜和红外光谱等手段对产物进行了表征. 结果表明，产物纳米花是由大量的Co3O4纳米须组成，纳 米须的直径为20?40 nm，长度为100?500 nm，具有纳米孔结构，比表面积约为34.61 m2/g. 磁性测量表明，在零场冷却条件下，产物主要表现为反铁磁性；在加场冷却条件下，闭锁温度约为34K时，产物主要表现为铁磁性．

Synthesis and Magnetic Properties of Co3O4 Nanoflowers

Co3O4 nanoflowers were prepared through a sequential process of a hydrothermal reaction and heat treatment. The as-synthesized products were characterized by powder X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, and infrared spectrum. These nanoflowers consist of numerous Co3O4 nanofibers, which have diameters of 20-40 nm, and lengths ranging from 100 nm to 500 nm. They have pore structures and Brunauer-Emmett-Teller surface area of ?34.61 m2/g. The temperature dependence curves of magnetization in zero-field-cooled conditions and field-cooled indicate mainly antiferromagnetism and weak ferromagnetism of Co3O4 nanoflowers at blocking temperature of ?34 K respectively.