物理化学学报 >> 1998, Vol. 14 >> Issue (01): 13-20.doi: 10.3866/PKU.WHXB19980104

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改进溶胶凝胶过程制备CdS/SiO2量子点玻璃

黄建滨, 戴庆红, 桂琳琳   

  1. 北京大学物理化学研究所，北京 100871
  • 收稿日期:1997-04-07 修回日期:1997-05-29 发布日期:1998-01-15
  • 通讯作者: 黄建滨

The Preparation of Quantum-dot CdS Doped Silica Glass by the Improved Sol-gel Process

Huang Jian-Bin, Dai Qing-Hong, Gui Lin-Lin   

  1. Institute of Physical Chemistry,Peking University,Beijing 100871
  • Received:1997-04-07 Revised:1997-05-29 Published:1998-01-15
  • Contact: Huang Jian-Bin

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摘要：

改进了溶胶凝胶转变过程中金属镉盐的引入方式，首次采用与镉盐络合（配合物法）和将镉盐与表面活性剂形成微乳（微乳法）的不同方式将镉盐均匀掺杂于硅溶胶中，并制备了硫化镉掺杂质量比为0.88～7.4Wt％硫化镉／二氧化硅量子点复合玻璃材料．其吸收光谱中的吸收边界与常规溶胶凝胶过程制备样品的吸收光谱边界相比有更明显的蓝移，体现出更为显著的量子效应．

关键词: 量子点玻璃, 纳米超细微粒, 溶胶凝胶法, 量子效应

Abstract:

The sol-gel process has been applied successfully to the preparation of small-sized CdS-doped silica glasses. Silica glasses containing 0.887.4wt% CdS were synthesized in a process in which ethylene diamine tetra-acetic acid (EDTA) or surfactant microenmulsion is added to obtain smaller size CdS crystal with narrower size distribution. These additives can be removed after the heat treatment during the densification procedure. The optical absorption edge of CdS crystals in doped glasses obtained by new methods exhibited larger blue shifts(comparing with the bulk absorption edge value of CdS crystal) than that without addition of EDTA or surfactant microemulsion in the preparing process. Thus the quantum size effect was found to be enhanced for glasses containing CdS prepared by the improved sol-gel process.

Key words: Quantum dot glass, Nanocomposite, Sol-gel process, Quantum size effect