Tunable synthesis of multi-shaped PbS via l-cysteine assisted solvothermal method

Publication date: 1 November 2014
Source:Journal of Crystal Growth, Volume 405
Author(s): Baohua Zhang , Fuqiang Guo , Lianhong Yang , Junjun Wang
Lead sulfide (PbS) with multi-morphologies were synthesized via solvothermal route under the assistance of l-cysteine. Reaction conditions such as concentration of l-cysteine, reacting temperature, reacting time and solvents have been systemically investigated in order to obtain shape-controlled PbS micro-crystals. A series of morphologies, such as cubic, Dendritic Hierarchical, Octagonal Hierarchical flowerlike and Vertebration shapes were obtained successfully. Self-assembly and a hypothesis based on Boltzmann distribution were introduced for illustration of morphology evolution obtained under different reacting temperatures, and the effect of the solvents and the role of l-cysteine were also discussed in detail. To testify the effects of different morphologies on the optical properties of PbS, the absorption spectra of some samples were measured. These results demonstrated that our work offers an effective way to develop the tunable synthesis of multi-shaped PbS for various applications.