单斜相ZrO2纳米棒:形成机理和晶相调控
单斜相ZrO2纳米棒:形成机理和晶相调控
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DOI：
10.1039/c5ce02269j
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发表时间：
2015
期刊：
影响因子：
3.1
通讯作者：
Wenjie Shen
中科院分区：
文献类型：
--
作者：
Aling Chen;Yan Zhou;Shu Miao;Yong Li;Wenjie Shen
在水热条件下，通过调节锆离子的水解速率和油酸钠作为封盖剂，对ZrO2纳米颗粒的晶相和形状进行了微调。在较低的pH值9.4下，获得了直径为~3 nm、长度为30 ~ 40 nm的纯单斜ZrO2纳米棒；而在较高的pH值11.4下，形成了单斜相和四方相混合的~4 nm的单分散ZrO2颗粒。从锆离子的水解速率和油酸类的结构导向作用等方面探讨了它们的形成机理。由于存在大量的氧空位缺陷，单斜ZrO2纳米棒在紫外光（365 nm）激发下表现出明显的蓝绿色荧光。
The crystal phase and shape of ZrO2 nanoparticles were finely tuned by mediating the hydrolysis rate of zirconium cations and using sodium oleate as the capping agent under hydrothermal conditions. Pure monoclinic ZrO2 nanorods with a diameter of ~3 nm and length of 30–40 nm were obtained at a lower pH value of 9.4; whereas monodispersed ZrO2 particles of ~4 nm with mixed monoclinic and tetragonal phases were formed at a higher pH value of 11.4. Their formation mechanism was discussed in terms of the hydrolysis rate of the zirconium cations and the structure-directing role of the oleate species. The monoclinic ZrO2 nanorods showed prominent blue-green fluorescence under excitation by an ultraviolet lamp (365 nm) because of the presence of a large number of oxygen-vacancy defects.