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采用水热法制备了Co掺杂的SnO2纳米棒。随着Co掺杂浓度的增加,样品的室温铁磁性先增加后降低,当Co掺杂浓度为4%时,样品的饱和磁化强度达到最大值。纳米棒呈花簇状生长,单根纳米棒长度约300nm,为单晶金红石型SnO2相。X射线光电子能谱和X射线近边结构谱分析表明,Co在SnO2样品中以+2价态存在,替代了Sn4+离子的位置,并未与其它元素形成杂质相,从而证明室温铁磁性为Sn1-xCoxO2纳米棒的本征性能。同时,采用自旋分裂杂质带模型,解释了Co掺杂浓度对样品室温铁磁性的调节作用。
Co-doped SnO2 nanorods were prepared by hydrothermal method. With the increase of Co doping concentration, the room temperature ferromagnetism firstly increases and then decreases. When the doping concentration of Co is 4%, the saturation magnetization reaches the maximum value. The nanorods grow in the form of flower clusters, and the single nanorods are about 300 nm in length, which is a monocrystalline rutile SnO2 phase. The results of X-ray photoelectron spectroscopy and X-ray near-edge structure analysis show that Co exists in the +2 valence state in the SnO2 sample instead of the Sn4 + ion and does not form impurity phase with other elements, thus proving that the room temperature ferromagnetism is Sn1 Intrinsic properties of -xCoxO2 nanorods. At the same time, the spin-splitting impurity band model was used to explain the effect of Co doping concentration on the room temperature ferromagnetism.