Abstract: Star-shaped dendritic PbS nanocrystals have been synthesized by the reaction of lead acetate and thioacetamide in the presence of CTAB through a hydrothermal process at 80 ℃ for 5 h. XRD, TEM, SAED, SEM were used to characterize the products. The results show that the products were star-shaped dendritic PbS single crystals in cubic phase, and the six arms of the star extended along the six <100> directions. It has been found that the presence of the CTAB and the release rate of S^2- ions from the sulfur sources are crucial for the formation of the star-shaped dendritic PbS crystals.

Key words: PbS, star-shaped, dendritic, CTAB

摘要： 在CTAB（十六烷基三甲基溴化铵）的辅助下，以醋酸铅和硫代乙酰胺为原料，在80 ℃的水热条件下反应5 h制备了星形树枝状的硫化铅纳米晶，并用XRD、TEM、SAED、SEM对产物进行了表征。结果显示得到的产物为立方相PbS单晶，星形结构的6个臂分别指向立方相PbS晶体的6个<100>方向。研究发现CTAB的使用和硫源的释硫速率对生成这种星形树枝状结构起了很大的作用。

关键词: PbS, 星形, 树枝状, CTAB