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Citation: Huang Jian-Bin, Dai Qing-Hong, Guo Guo-Lin, Gui Lin-Lin. Study on CdS/SiO₂ Quantum-dot-glass Prepared by Sol-gel Method[J]. Acta Physico-Chimica Sinica, ;1996, 12(07): 621-628. doi: 10.3866/PKU.WHXB19960709 shu

Study on CdS/SiO₂ Quantum-dot-glass Prepared by Sol-gel Method

1.
Institute of Physical Chemistry,Peking University,Beijing 100871

Received Date: 15 December 1995
Available Online: 15 July 1996

The sol-gel process has been applied to the preparation of small size CdS crystal doped silica glasses. Silica glasses containing 0.88~30 wt % CdS were synthesized in a process which includes two-step hydrolysis of Si(OC2H5)4 and Cd(CH3COO)2•2H2O,drying and heating of doped gels, and reaction by exposing the porous glass of CdO/SiO2 to H2S gas. The sol-gel transition point was determined by measuring the variation of the viscosity with hydrolysis time. It was found that the gel point was affected by the Cd(CH3COO)2•2H2O content and kinds of acid-catalyst (HNO3 of HCl) . About 2 cm diameter monoliicth dry gel was obtained in the sealed box in which microenvironment (humidity, temperature and chemical atmosphere etc. ) was automatically controlled by the computer. From the results of the low frequency inelastic Raman scattering and transmission electron micrographs, CdS crystals were 1.6 to 8.4 nm in diameter for different doped systems. in the optical absorption spectra, the absorption edge exhibited a blue shift compared with that of the bulk CdS. Thus the quantum size effect was found for glasses containing CdS prepared by the sol-gel process.
- Sol-gel process,
- Quantum dot glass,
- Nanocomposite,
- Absorption edge blue shift,
- Quantum size effect
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Study on CdS/SiO2 Quantum-dot-glass Prepared by Sol-gel Method

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Study on CdS/SiO₂ Quantum-dot-glass Prepared by Sol-gel Method