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运用溶胶 凝胶法合成了GeO2 SiO2 纳米复合材料 ,探索了为 pH在 2的条件下通过水解Si(OC2 H5) 4和GeCl4合成GeO2 SiO2 干胶的过程。在 10 0～ 12 0 0℃下对干胶进行热处理。采用UV光谱法测定了材料的光学性质 ,观察到随热处理温度的升高 ,样品光谱的吸收边向长波方向移动。由于温度的影响 ,晶粒长大 ,带隙能量减小 ,纳米微晶的量子尺寸效应显示出来。经X射线衍射分析 ,观察到了随热处理温度的增高 ,材料结构从无序到有序的转变过程 ,直到 110 0℃时 ,有明显的微晶生成 ,其尺寸为 5～ 10nm。
GeO2 SiO2 nanocomposite was synthesized by sol-gel method and the synthesis of GeO2 SiO2 paste by hydrolysis of Si (OC2 H5) 4 and GeCl4 at pH 2 was explored. The dry glue was heat-treated at 100 ~ 1200 ℃. The optical properties of the material were measured by UV spectroscopy. It was observed that the absorption of the sample shifted to the longwave direction with the increase of the heat treatment temperature. Due to the influence of temperature, the grain growth, the bandgap energy decreases, the quantum size effect of nanocrystals is revealed. The X-ray diffraction analysis shows that with the increase of heat treatment temperature, the structure of the material changes from disordered to ordered, and the crystallite formation is obvious at 110 0 ° C with the size of 5-10 nm.