高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (7): 1334.

• 研究论文 • 上一篇    下一篇

修饰剂链长变化对核壳结构CdS纳米晶尺寸和光学性质的影响

娄文静1, 陈淼1, 刘维民1, 薛群基1, 周祥克2   

  1. 1. 中国科学院兰州化学物理研究所,固体润滑国家重点实验室,中国科学院研究生院;
    2. 兰州大学物理科学与技术学院,兰州730000
  • 收稿日期:2004-06-14 出版日期:2005-07-10 发布日期:2005-07-10
  • 通讯作者: 陈淼(1970年出生),女,博士,研究员,从事功能材料界面光电化学行为的研究.E-mail:miaochen@lsl.ac.Cn E-mail:miaochen@lsl.ac.Cn
  • 基金资助:

    国家自然科学基金(批准号:20473106);国家“九七三”计划(批准号:2003CB716200)资助.

Effect of Difference of Modifiers' Chain on Size and Optical Property of Core-shell CdS Nanocrystals

LOU Wen-Jing1, CHEN Miao1, LIU Wei-Min1, XUE Qun-Ji1, ZHOU Xiang-Ke2   

  1. 1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Graduate School of Chinese Academy of Sciences, Lanzhou 730000, China;
    2. School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
  • Received:2004-06-14 Online:2005-07-10 Published:2005-07-10

摘要: 采用液液两相法,在甲苯和水的两相体系中制备了由不同烷基链长单硫醇修饰的具有无机-有机核壳结构的CdS半导体纳米晶.使用透射电子显微镜(TEM)、X射线粉末衍射(XRD)和紫外-可见吸收光谱(UV-Vis)对样品的结构和组成进行了表征.结果表明,样品CdS半导体纳米晶是由无机纳米核及其表面化学吸附的硫醇组成的,而且壳层有机修饰剂对无机纳米核的尺寸和光学性质影响很大.进一步分析发现,层修饰剂的烷基链长和CdS纳米核的尺寸之间存在着类似抛物线的关系.这主要是由于在两相体系中,Cd纳米核的形成和成长两个阶段受到修饰剂在有机相中的迁移率以及其在纳米核表面的组装有序度两种关键因素竞争结果的控制.

关键词: 液液两相法, CdS纳米晶, 核壳结构, 表面迁移率, 组装有序度

Abstract: Core-shell CdS nanocrystals, which were modified by different-chain length alkyl thiols, were chemically synthesized by a new liquid-liquid two-phase method. The structure and composition were investigated with UV-Vis absorption spectra, X-ray diffraction, and transmission electron microscopy. The results showed these as-prepared samples consisting of a nano-CdS core and a capped-layer of thiols chemically absorbed on the surface, and the modifiers had a great effect on the size and optical property of the inorganic nano-core. According to further analysis, it was found that the size of CdS nano-core had a quasi-parabola relation with the chain length of the modifiers, which was caused by the competitive result of the surface mobility and self-assembly order of the modifiers in the course of nucleation and growth of CdS nano-core

Key words: Liquid-liquid two-phase method, CdS nanocrystals, Core-shell structure, Surface mobility, Self-assembly order

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