物理化学学报 >> 2011, Vol. 27 >> Issue (05): 1239-1243.doi: 10.3866/PKU.WHXB20110513

材料物理化学 上一篇    下一篇

以无机硫为原料制备硫化铅量子点及其表征

岳栋1,2, 张建文1, 张敬波2, 林原2   

  1. 1. 北京化工大学流体力学与传热研究室, 北京 100029;
    2. 中国科学院化学研究所光化学重点实验室, 北京分子科学国家实验室, 北京 100190
  • 收稿日期:2011-01-14 修回日期:2011-03-08 发布日期:2011-04-28
  • 通讯作者: 张建文, 张敬波 E-mail:zhangjw@mail.buct.edu.cn; jbzhang@iccas.ac.cn
  • 基金资助:

    国家自然科学基金(20873162)和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

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

YUE Dong1,2, ZHANG Jian-Wen1, ZHANG Jing-Bo2, LIN Yuan2   

  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:2011-01-14 Revised:2011-03-08 Published:2011-04-28
  • Contact: ZHANG Jian-Wen, ZHANG Jing-Bo E-mail:zhangjw@mail.buct.edu.cn; jbzhang@iccas.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20873162) and State Key Laboratory of Pollution Control and Resource Reuse Foundation of China (PCRRF09006).

摘要:

根据高温下快速成核低温下慢速生长的量子点制备原理, 采用胶体化学的方法成功制备了不同粒径的硫化铅半导体量子点. 这种方法的特点是以无味和低毒的硫化钠作为制备硫化铅量子点硫的前驱物, 因此这是一种量子点的绿色化学合成方法. 油酸作为稳定剂控制硫化铅的粒径. 采用X射线衍射和高分辨透射电镜表征了量子点的晶体结构、形貌和粒径, 采用可见-近红外吸收光谱研究了硫化铅量子点的量子尺寸效应. 通过降低油酸的添加量可以促进量子点的生长, 得到较大粒径量子点. 并探讨了量子点的生长机理.

关键词: 量子点, 硫化铅, 硫化钠, 绿色合成, 粒径分布

Abstract:

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.

Key words: Quantum dots, Lead sulfide, Sodium sulfide, Green synthesis, Size distribution

MSC2000: 

  • O649