波长与功率密度对激光烧蚀制备纳米粒子的影响  

Effects of Laser Wavelength and Power Densities on Nanoparticles Made by Laser Ablation

作　　者：金桂林[1] 金晓英[1] 朱莉[1] 宋顺军[1] 

机构地区：[1]华东理工大学,上海200237

出　　处：《激光与红外》2005年第9期633-636,共4页Laser & Infrared

摘　　要：用TEA CO2激光烧蚀方法制备了NiSO4/Ni(Ac)2纳米粒子,其化学成分与靶材原料十分相似,其中含少量Ni2O3.当采用被靶材物质直接吸收的激光谱线9P(18)、9R(18)时,纳米粒子的保成分性较好,得到粒径10～20nm、分散性良好的圆形粒子,其功率密度阈值为1.6×108w/cm2,其反应机理主要是共振吸收以及激光支持爆轰波的作用;当采用不被靶材物质直接吸收的激光谱线10P(18)时,得到粒径为20～25nm、分散性良好的方形粒子,其功率密度阈值为1.9×108w/cm2,其反应机理主要是自聚焦和内爆轰的作用.当其它条件相同时,功率密度较大则粒子的粒度更细.Nanoparticles of NiSO4/Ni （Ac）2 were made by ablation of TEA CO2 laser, the chemical composition of which was very similar to that of their target materials,and a little Ni2O3 was contained. A good property of preservingcomposion was abtained, while the laser lines of 9P （ 18 ） and 9R （ 18 ） absorbed directly by target materials were used; and round nanoparticles of size 10 ～ 20nm ,well dispersed, were prepared. The threshold of laser power density of these lines was 1.6 × 10^8w/cm^2. The reaction mechanism was the effects of resonant absorption and laser supported-detonation wave. While the line of 10P （18）, not absorbed derectly by target materials, was used, square nanoparticles of size20 ～ 25nm,well dispersed,were prepared. The threshold of laser power density was 1.9 × 10^8w/cm^2. The reaction mechanism was the effects of serf-focussing ang inner-detonation. When the other conditions were the same, the higher the power density was, the finer the nanoparticles could be obtained.

关 键 词：激光烧蚀 纳米粒子 波长 功率密度 

分 类 号：TN249[电子电信—物理电子学] TB383[一般工业技术—材料科学与工程]