A facile additive-free method for tunable fabrication of UO2 and U3O8 nanoparticles in aqueous solution
A facile additive-free method for tunable fabrication of UO2 and U3O8 nanoparticles in aqueous solution
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DOI：
10.1039/c3ce42140f
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发表时间：
2014-03
期刊：
影响因子：
3.1
通讯作者：
Ran Zhao;Lin Wang;Zhanjun Gu;Li-yong Yuan;Chengliang Xiao;Yuliang Zhao;Z. Chai;W. Shi
中科院分区：
文献类型：
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作者：
Ran Zhao;Lin Wang;Zhanjun Gu;Li-yong Yuan;Chengliang Xiao;Yuliang Zhao;Z. Chai;W. Shi
采用简单的无添加剂水热合成方法，成功地合成了平均粒径为30 ~ 250 nm的球形UO 2纳米颗粒和宽度为400 nm、长度为1 μm的U3 O 8纳米立方体。为了选择性地获得相纯的U3 O 8和UO 2纳米颗粒，建立并优化了实验条件，如溶液pH、温度以及肼的浓度。采用X射线衍射（XRD）和扫描电镜（SEM）对产物进行了表征。为了研究纳米铀氧化物的生长机理，对不同pH值和水热时间下制备的前驱体进行了XRD、SEM和FT-IR测试。肼在不同pH值溶液中的还原能力不同是可调控制备氧化铀纳米颗粒的关键因素。
Spherical UO2 nanoparticles with an average diameter varying from 30 to 250 nm and U3O8 nanocuboids with a width of 400 nm and a length of 1 μm have been successfully synthesized just by a simply additive-free hydrothermal synthesis method. To selectively obtain the phase-pure U3O8 and UO2 nanoparticles, the experimental conditions, such as the solution pH and temperature as well as the concentration of hydrazine, have been established and optimized. The products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In order to investigate the growth mechanism of the uranium oxide nanoparticles, XRD, SEM and Fourier transform infrared (FT-IR) spectrum measurements were carried out for the precursors prepared at different pH and hydrothermal time. The crucial factor for tunable fabrication of uranium oxide nanoparticles could come from the different reducing ability of hydrazine at various solution pH.