State Key Laboratory of New Ceramics and Fine Processing; Department of Chemistry, Tsinghua University, Beijing, 100084 PR China.
J Am Chem Soc. 2009 Nov 18;131(45):16423-9. doi: 10.1021/ja903633d.
Systematically shape-controlled synthesis of inorganic nanocrystals has attracted increasing attention recently for both fundamental and technological interest. The shape evolution of CdSe nanocrystals with wurtzite structure in a unified method has been previously well studied, while the study on shape evolution of CdSe nanocrystals with zinc blende structure still remains challenging. Here, we demonstrate a systematic shape variation of zinc blende CdSe nanocrystals in a modified organometallic approach, in which distinct shapes of cube-shaped, sphere-shaped, tetrahedron-shaped, and branched CdSe nanocrystals with high yield and good uniformity are obtained. The crucial factor that influences the shape-controlled process is the reactive temperature. This wide variation of shapes provides important information about the growth of CdSe nanocrystals, and it can also help in the shape-controlled synthesis of other nanocrystals that are bound with uniform crystal planes.
近年来，人们对无机纳米晶体的系统形状控制合成产生了越来越多的兴趣，这既具有基础研究意义，又具有技术应用价值。具有纤锌矿结构的 CdSe 纳米晶体的形状演变已经得到了很好的研究，而具有闪锌矿结构的 CdSe 纳米晶体的形状演变仍然具有挑战性。在这里，我们在改进的有机金属方法中展示了闪锌矿 CdSe 纳米晶体的系统形状变化，其中以高产率和良好的均一性获得了立方体、球形、四面体和分支状 CdSe 纳米晶体等不同形状。影响形状控制过程的关键因素是反应温度。这种广泛的形状变化为 CdSe 纳米晶体的生长提供了重要信息，并且它还可以帮助控制其他具有均匀晶面的纳米晶体的合成。
