激光蒸凝法制备氧化铈纳米粒子

Preparation of CeO_2 Superfine Powder by Laser Heating Gas-Evaporation Method

摘要:

以单模100W CW CO2激光器为光源，碳酸铈为靶材，采用激光蒸凝法制备出了氧化铈纳米粒子。并用X射线衍射，电子衍射，透射电镜等技术对纳米粒子的性能进行了表征，同时对纳米粒子的形成机理进行了初步的探讨。结果表明，激光功率密度、反应压力、载气种类及流量等工艺参数对产品的粒度等性能均有影响，在惰性气氛下得到产物氧化铈的粒径比较大，为50nm～80nm，在还原性气氛下得到产物仍然是立方晶系的氧化铈，粒径较小大约10nm～20nm。

Abstract:

CeO2 superfine powder was well prepared by laser heating gas-evaporation method with a 150 W CW CO2 laser as light source and Ce2(CO3)3 as targets. All the effects of process reaction parameters on products have been well researched. Measurements such as XRD, TEM were used to characterize the superfine particles. The obtained results show that many parameters such as the laser power density, reaction pressure, sort and rate of airflows affect the size and morphorlogy of nanoparticles. The size of the particle changes within 50 nm-80 nm in Ar atmosphere, and 10 nm-20 nm in deoxidization atmosphere of H2.