Key Laboratory of Advanced Functional Materials of Autonomous Region, Institute of Applied Chemistry, Xinjiang University, Urumqi, Xinjiang, 830046, China.
Nanoscale Res Lett. 2012 Dec 6;7(1):668. doi: 10.1186/1556-276X-7-668.
The sub-micrometer PbS with anisotropic microstructures including fishbone-like dendrites, multipods, cubes, corallines, and hopper cubes were successfully prepared by the solvothermal process. Different morphologies can be obtained by adjusting the reaction temperatures or using the nontoxic controlled reagents which can tune the relative growth rate in the <100> direction and the <111> direction of PbS nuclei. Based on the viewpoint of crystallography about face-centered cubic crystal structure, the possible formation mechanism for sub-micrometer anisotropic structures has been discussed. The difference between the enhanced growth rates on the {100} and {111} planes induced the change of ratio between the growth rates in the <100> and <111> directions, which resulted in the formation of the different PbS anisotropic microstructures. The PbS anisotropic structures exhibited the different visible emission with a peak in the red regions mainly attributed to the variation of shape, size, and the trap state of as-obtained PbS.
采用溶剂热法成功制备了具有各向异性微结构的亚微米级 PbS，包括鱼骨状树枝状、多足状、立方体、珊瑚状和漏斗状立方体。通过调节反应温度或使用无毒的控制试剂，可以获得不同的形貌，这些试剂可以调节 PbS 核在<100>方向和<111>方向的相对生长速率。基于面心立方晶体结构的晶体学观点，讨论了亚微米各向异性结构的可能形成机制。在{100}和{111}面上增强的生长速率之间的差异导致了<100>和<111>方向上生长速率之间的比例发生变化，从而导致了不同的 PbS 各向异性微结构的形成。所得到的 PbS 各向异性结构表现出不同的可见发射，其峰值主要位于红色区域，这主要归因于获得的 PbS 的形状、尺寸和陷光态的变化。
