| GeO2-SiO2纳米复合材料的合成及其光学特性研究 |
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| 引用本文： | 周延怀,冯玉英,陆海彦.GeO2-SiO2纳米复合材料的合成及其光学特性研究[J].光谱学与光谱分析,2000,20(1):23-24. |
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| 作者姓名： | 周延怀 冯玉英 陆海彦 |
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| 作者单位： | 1. 南京师范大学物理系,210097,南京
2. 南京师范大学理化中心,210097,南京 |
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| 基金项目： | 江苏省教育厅自然科学基金，江苏省重点实验室基金，，，， |
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| 摘 要： | 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(OC2H5)4和GeCl4合成GeO2-SiO2干胶的过程.在100～1 200℃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1 100℃时,有明显的微晶生成,其尺寸为5～10nm.
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| 关 键 词： | 溶胶－凝胶 纳米半导体材料 GeO2－SiO2 |
| 修稿时间： | 1998年9月28日 |
Study on Optical Proporties and Synthesis of Nanosized GeO2-SiO2 Glasses |
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| Yanhuai ZHOU,Yuying FENG,Haiyan LU.Study on Optical Proporties and Synthesis of Nanosized GeO2-SiO2 Glasses[J].Spectroscopy and Spectral Analysis,2000,20(1):23-24. |
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| Authors: | Yanhuai ZHOU Yuying FENG Haiyan LU |
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| Institution: | Department of Physics, Nanjing Normal University, 210097 Nanjing. |
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| Abstract: | The compound material of nm size particles GeO2-SiO2 was synthesized through hydrolysis of Si(OC2H5)4 and GeCl4 with pH-2. A heat-treatment was carried out for samples at 100-1,200 degrees C in air. Its optical property was determined by UV-Vis spectrum. We have found that the absorption edge of spectrum shifted progressively to longer wavelengths. The quantum size effect of nanocrystals appears because crystals grow and the energy of optical band gap reduces due to the influence of temperature. By the analysis of X-ray diffraction we have observed the process in which the structure of particles changed from disorder into order, and the particles with size 5-10 nm came into obviously as temperature increased until 1,100 degrees C. |
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| Keywords: | Sol gel method Nanomaterial Quantum size effects |
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