中文摘要：

象花、球形、立方的 PbS nanoparticles 被 refluxing 半胱氨酸和硝酸铅成功地在碱性溶液综合了。到臼齿的比率，反应混合的酸碱值价值以及 refluxing 在 PbS nanoparticles 的形状上预定的 Pb~(2+) 的半胱氨酸的影响被调查。详细试验性的结果证明到 Pb~(2+)(5.2:1 ) 和更短的 refluxing 时间的半胱氨酸的更高臼齿的比率在酸碱值赞成象花的 PbS nanoparticles 的形成 9.0。当更低的酸碱值价值(8.0 ) 赞成球形的 PbS 的形成时，然而， nanoparticles，和更高的酸碱值价值(10.0 ) 赞成立方的 PbSnanoparticles 的形成。为 PbS nanoparticles 的形状控制的机制被讨论。

英文摘要：

Flowerlike, spherical and cubic PbS nanoparticles have been successfully synthesized by refluxing cysteine and lead nitrate in an alkaline solution. The influences of the cysteine to Pb^2＋ molar ratio, the pH value of the reaction mixture as well as the refluxing time on the shape of PbS nanoparticles were investigated. Detailed experimental results demonstrated that a higher molar ratio of cysteine to Pb^2＋ （5.2：1） and shorter refluxing time favor the formation of flowerlike PbS nanoparticles at pH 9.0. While lower pH value （8.0） favors the formation of spherical PbS nanoparticles, and higher pH value （10.0）, however, favors the formation of cubic PbS nanoparticles. The mechanism for the shape control of PbS nanoparticles is discussed.