不同炭化温度制备的C/0.5Al_2O_3-0.5P_2O_5-100SiO_2凝胶玻璃的光学性质  

Optical Characteristics of C/0.5Al_2O_3-0.5P_2O_5-100SiO_2 Gel Glasses Prepared at Different Temperatures

作　　者：杨合情[1,2] 王喧[3] 张邦劳[1] 李永放[3] 房喻[1] 张良莹[4] 姚熹[4] 

机构地区：[1]陕西师范大学化学与材料学院 [2]西安交通大学电子材料与器件研究所,西安710049 [3]陕西师范大学物理系 [4]西安交通大学电子材料与器件研究所

出　　处：《无机材料学报》2003年第6期1181-1186,共6页Journal of Inorganic Materials

摘　　要：通过醇盐不完全水解制备了含有有机基团(O-C_2H_5)的0.5Al_2O_3-0.5P_2O_5-100SiO_2凝胶,在氮气中加热到300～700℃使其中的有机基团炭化,得到镶嵌在凝胶玻璃中不同尺寸的碳纳米颗粒.利用高分辨电镜、X射线衍射和喇曼光谱研究了碳纳米颗粒的结构,发现凝胶玻璃中的碳颗粒为非晶碳纳米颗粒.测试了它们的吸收光谱,发现了由于量子限域效应引起的吸收边的移动.在532um Nd:YAG激光的激发下镶嵌有碳纳米颗粒的凝胶玻璃有一强的室温发光,发光峰在586um左右.发光峰几乎不随碳纳米颗粒尺寸的变化而变化.这种发光产生于碳纳米颗粒的表面或碳颗粒和凝胶网络的界面.0.5Al(2)O(3)-0.5P(2)O(5)-100SiO(2) gels containing organic group (OC2H5) were synthesized through partial hydrolysis of alkoxide. The gels were calcined at 300similar to700degreesC in N-2 atmosphere, in which - OC2H5 was carbonized to form carbon nanoparticles with various sizes. Their absorption and photoluminescence spectra were measured. The absorption edge shifts to the higher-energy side as the size of the carbon particle decreases. This phenomenon was interpreted in terms of a quantum confinement effect of electron and hole in the carbon nanoparticles. The gel glasses doped with carbon nanoparticles show a strong and broad room-temperature photoluminescence with a peak located around 586nm under the excitation of 532nm line of a Nd:YAG laser. The position of photoluminescence peaks shifts hardly with changing the size of carbon nanoparticles. The photoluminescence spectra axe originated from the surface of carbon nanoparticles or interfacial layer between it and gel matrix. The carbon nanoparticles are amorphous carbon nanoparticle in the gel glasses by the X-ray diffraction, high-resolution transmission electron microscopy and Raman spectra.

关 键 词：C/0.5Al2O3-0.5P2O5-100SiO2凝胶玻璃 红光发射 吸收光谱 

分 类 号：TQ171[化学工程—玻璃工业]