Citation: YUE Dong, ZHANG Jian-Wen, ZHANG Jing-Bo, LIN Yuan. Preparation of PbS Quantum Dots Using Inorganic Sulfide as Precursor and Their Characterization[J]. Acta Physico-Chimica Sinica, ;2011, 27(05): 1239-1243. doi: 10.3866/PKU.WHXB20110513 shu

Preparation of PbS Quantum Dots Using Inorganic Sulfide as Precursor and Their Characterization

1.
1. Laboratory of Computational Fluid Dynamics and Heat Transfer, Beijing University of Chemical Technology, Beijing 100029, P. R. China;
2. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Received Date: 14 January 2011
Available Online: 31 March 2011
Fund Project: 国家自然科学基金(20873162) (20873162)污染控制与资源化研究国家重点实验室开放课题(PCRRF09006)资助项目 (PCRRF09006)

PbS semiconductor quantum dots with different particle sizes were successfully prepared by the colloidal chemistry method according to the theory of fast nucleation at high temperature and slow growth at low temperature. Sodium sulfide was used as a sulfur precursor because it is odorless and is less noxious, which allows it to be classified as a green precursor. Oleic acid was used as a stabilizing agent to control the particle growth and it thus assisted in the formation of monodisperse PbS quantum dots. The crystalline structures, morphology, and particle size of the quantum dots were characterized by powder X-ray diffraction and high-resolution transmission electron microscopy. The quantum size effect of the PbS nanoparticles was analyzed by visible near-infrared (Vis-NIR) absorption spectroscopy. The mean size of the PbS quantum dots increased with a decrease in the concentration of oleic acid. A possible growth mechanism for the PbS nanoparticles was also discussed.
- Quantum dots,
- Lead sulfide,
- Sodium sulfide,
- Green synthesis,
- Size distribution
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