Synthesis of Cu-Doped TiO2 Nanorods with Various Aspect Ratios and Dopant Concentrations
Synthesis of Cu-Doped TiO2 Nanorods with Various Aspect Ratios and Dopant Concentrations
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DOI：
10.1021/cg9012944
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发表时间：
2010-02
影响因子：
3.8
通讯作者：
M. You;Tae Geun Kim;Y. Sung
中科院分区：
文献类型：
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作者：
M. You;Tae Geun Kim;Y. Sung
采用可控水解法合成了不同长径比的胶体TiO 2纳米棒，并成功掺杂了Cu。电感耦合等离子体（ICP）原子发射光谱分析表明，所制备的TiO 2纳米棒含有1.7 - 3.2at%的Cu。X射线衍射（XRD）和高分辨透射电子显微镜（HRTEM）分析表明，掺杂纳米棒具有高度结晶的层状结构，其晶体生长取向优选为[001]。利用X射线光电子能谱（XPS）对纳米棒的表面组成和化学状态进行了分析，证实了Cu离子对Ti晶格的真实的掺杂。通过使用振动样品磁强计（VSM）的磁性研究，证实了Ti 1 − xCuxO 2纳米棒在室温（300 K）下保持表观铁磁有序。同时，还从Cu掺杂增加了氧空位浓度的角度解释了铁磁性的来源。
Colloidal TiO2 nanorods were synthesized with different aspect ratios and successfully doped with copper via a controlled hydrolysis method. Inductively coupled plasma (ICP) atomic emission spectroscopy analyses showed that the as-prepared TiO2 nanorods contained ∼1.7−3.2 at% Cu. X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) analyses revealed that the doped nanorods are in a highly crystalline anatase structure and their crystal growth orientation is preferably [001]. The real doping of Ti lattices with Cu ions was evidenced by the analyses of surface compositions and chemical states of the nanorods using X-ray photoelectron spectroscopy (XPS). Through magnetic investigation using vibration sample magnetometry (VSM), it was verified that the Ti1−xCuxO2 nanorods maintain apparent ferromagnetic ordering at room temperature (300 K). The origin of the ferromagnetic property was explained based on the concentration of oxygen vacancies increased by Cu doping, which was als...