脉冲激光法连续制备高蓝光荧光性的修饰纳米ZnO乙醇溶胶

采用聚焦脉冲激光束轰击浸于含有水杨酸的无水乙醇流动相中的ZnO固体靶, 连续制备得到了强度高达1.12×105的蓝色荧光(440 nm)的水杨酸修饰纳米ZnO乙醇溶胶. 考察了修饰剂的种类、浓度、添加顺序和流动相流速对其荧光性能的影响. 透射电镜结果表明, 所制备的纳米ZnO粒径分布在15—30 nm.

Successive Preparation of High Blue Fluorescence of Decorated Nano Zinc Oxide Ethanol Sol by Pulsed Laser Ablation

Decorated nano-ZnO ethanol sols which were modified in situ were successively produced by pulsed laser ablation at the interface of ZnO target submerged in the flowing liquid which contained modification agents. It is found that ZnO ethanol sol decorated by Hsal radiates intense blue light under ultraviolet radiation and has a broad emission band centered at 440 nm in the emission fluorescence spectrum. The emission intensity in 440 nm is as high as 1.12×105. We studied some factors including different modification agents and their added methods, concentration of Hsal(salicylic acid), flowing liquid velocity, aging time after preparation which have effect on luminescence characteristics of sols. The results shows that the decorated nano-ZnO ethanol sol with best fluorescent characteristics can be obtained in following conditions: ethanol solution of Hsal as flowing liquid, concentration of Hsal is 4.2×10-3 mol/L, flowing liquid velocity is 0.025 mL/s and proper aging time after preparation the ZnO ethanol sol. TEM results show that the diameter of nano-ZnO particles is about 15—30 nm. The study presents a convenient method to obtain the decorated nano-zinc oxide organic sol of high blue luminescence.