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采用溶胶凝胶工艺在室温合成含有Zn、Se成分和玻璃相成分的均匀透明凝胶,并通过CO还原气氛热处理,在凝胶玻璃中原位生长出ZnSe纳米晶体.利用BET比表面积、透射电镜、吸收光谱、荧光光谱等分析手段对ZnSe纳米复合材料的组成结构及量子尺寸效应影响下的光学性能进行了表征,结果表明:5B2O3-95SiO2凝胶玻璃的多孔结构可有效地分散ZnSe纳米晶粒;纳米复合材料中ZnSe纳米晶粒呈球形,粒径约为3.5 nm;吸收光谱中,ZnSe纳米复合材料的吸收边相对于ZnSe体材料发生蓝移,随着ZnSe在凝胶玻璃中摩尔分数的增大,蓝移量减小,相应ZnSe纳米晶粒尺寸增大;在荧光光谱中,500 nm附近的发光带是凝胶玻璃中的ZnSe纳米晶体表面态复合和缺陷发光,当ZnSe的摩尔分数达到0.07时,观测到了浓度的荧光淬灭现象.
The ZnSe nanocrystals were grown in situ in the gel glass by the sol-gel process at room temperature.Firstly, the ZnSe nanocrystals were grown by heat treatment in CO reduction atmosphere.Using the BET specific surface area, transmission electron microscopy, The results show that the porous structure of 5B2O3-95SiO2 gel glass can effectively disperse the ZnSe nanocrystals. The optical properties of ZnSe nanocomposites are characterized by X-ray diffraction, UV-Vis absorption spectroscopy and fluorescence spectroscopy. In the absorption spectrum, the absorption edge of ZnSe nanocomposites is blue-shifted relative to that of ZnSe. With the increase of the molar fraction of ZnSe in the gel glass, In the fluorescence spectrum, the luminescent band near 500 nm is the surface state complex and defect luminescence of ZnSe nanocrystals in the gel glass. When the ZnSe mole fraction reaches At 0.07, a concentration of fluorescence quenching was observed.