Preparation of semiconducting sulfides microcrystalline-doped silica glasses by the sol-gel process

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Abstract
The sol-gel process has been applied successfully to the preparation of small-particle-size ZnS, CdS or PbS-doped silica glasses with a significant quantum size effect. Gels prepared through the hydrolysis of complex solutions of Si(0C2H5)4 and acetate of Zn, Cd or Pb were heated at 500 to 900°C, then reacted with H2S gas to form fine microcrystals doped glasses. From X-ray diffraction analyses and transmission electron mlcrographs, these crystals were cubic ZnS, hexagonal CdS and cubic PbS crystal, respectively, and their sizes were 2 to 8 nm in diameter. In the optical absorption spectra, the absorption edge exhibited a blue shift compared with those of the bulk sulfides crystals. Size dependence of energy shift was discussed in relation to size quantization of electron-hole in microcrystals. The nonlinearity was estimated to be 1.5 x i0O esu for 2% CdS doped glass.

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