溶胶-凝胶燃烧法合成Cr^(3+):Al_2O_3纳米粉体

SOL-GEL COMBUSTION SYNTHESIS OFCr^(3+):Al_2O_3 NANOMETER POWDERS

采用溶胶-凝胶燃烧法合成出Cr3+:Al2O3纳米粉体。将所制成的干凝胶加热至约500℃使之发生燃烧反应,再将燃烧产物在不同的温度下进行锻烧。利用热重-差热分析、X射线衍射(X-ray diffraction,XRD)、透射电子显微镜(transmission electron microscope,TEM)等对干凝胶及煅烧粉体进行表征,测试了纳米粉体的发光性能。研究了合成条件对粉体分散性、发光性能的影响。XRD和TEM分析表明:在1000℃煅烧1h后,粉体为α-Al2O3结构的单相氧化物粉体,颗粒大小为20～35nm。在制备溶胶时添加聚乙二醇可提高粉体的分散性。光谱分析表明:Cr3+:Al2O3纳米粉体的激发峰位于404nm和540nm,发射峰值位于692nm和668nm。

Cr3+:Al2O3 nanometer powders were prepared by sol-gel combustion synthesis.The dry gel was fired at 500 ℃ to initiate combustion,and then Cr3+:Al2O3 powders were formed when the combustion ashes were calcined subsequently at different tempera-tures.Thermogravimetric-differential thermal analysis,X-ray diffraction(XRD) and transmission electron microscopy(TEM) were employed to characterize the dry gel and powders.The luminescent properties of the nanometer powders were measured.The effects of synthesis condi...