Nucleation and growth of BaFxCl2-x nanorods.
Nucleation and growth of BaFxCl2-x nanorods.
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DOI：
10.1002/chem.200800363
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
Ting Xie;Shuai Li;Wenbei Wang;Q. Peng;Yadong Li
中科院分区：
文献类型：
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作者：
Ting Xie;Shuai Li;Wenbei Wang;Q. Peng;Yadong Li
采用液-固-溶液法制备了不同比例和不同尺寸的Ba2F3Cl2(BaFxCl2-x，x=1.5)纳米棒和纳米线以及正交BaF2(BaFxCl2-x，x=2)纳米棒。制备单分散Ba2F3Cl纳米棒和纳米线的工艺和实验结果表明，随着初始浓度的增加，比表面积增加。基于这一事实，从表面化学热力学(SCT)的角度证实了这些具有不同放大尺寸的纳米晶成核和生长过程的机理。在这种SCT机理中，比表面能同时考虑了表面活性剂油酸和纳米晶表面，并由吸附物的化学势决定。
Different ratios and sizes of Ba2F3Cl (BaFxCl2-x, x=1.5) nanorods and nanowires and orthorhombic BaF2 (BaFxCl2-x, x=2) nanorods were prepared by using a liquid-solid-solution approach at 160 approximately 180 degrees C. The processes and results of the experiments conducted to prepare monodisperse Ba2F3Cl nanorods and nanowires showed that the specific surface area increased as the initial concentrations were multiplied. Based on this fact, a mechanism for the nucleation and growth processes of these nanocrystals that have a variety of enlarged sizes was substantiated in view of the surface chemical thermodynamics (SCT). In this SCT mechanism, the specific surface energy takes into account both the surfactant oleic acid and the nanocrystal surface, and is dominated by the chemical potential of the adsorbate.