激光蒸凝法制备氧化锰纳米粒子

Preparation of Mn/O Nanoparticles by Laser Heating Gas-evaporation Method

以 15 0WCWCO2 激光器为光源 ,Mn(Ac) 2 ·4H2 O为靶材 ,采用激光蒸凝法制备出了氧化锰纳米粒子。初步研究了反应参数对纳米粒子性能的影响 ,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证 ,同时对纳米粒子的形成机理进行了初步探讨。实验结果表明 ,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、晶型等性能均有影响。在惰性气氛下 ,产物主要是Mn3 O4 5 6F ,粒径分布范围较宽 (5～ 10nm和 30～ 10 0nm)且不均一 ;在氧气气氛下 ,产物主要是立方晶系的Mn3 O4 和少量的立方晶系的MnO ,粒径分布范围变窄了 (5～ 10nm和 15～ 6 0nm) ,也不均一。

Mn/O nanopartiles were prepared by laser heating gas-evaporation method this paper, with a 150 W CW CO2 laser as light source and Mn(Ac)2 &middot 4H2O as a target. The effects of process parameters on nanoparticles have been pilot studied. XRD, DTA and TEM were used to characterize the samples. The formation mechanism of Mn/O nanoparticles was preliminarily discussed. Experimental results show that the process parameters such as laser power density, reaction pressure, the sorts and rate of airflows, effect the sizes and crystal system of nanoparticles. The products are Mn3O4 56F, and the diameters of nanoparticles are between 5-10 nm and 30-100 nm in Ar atmosphere. The products are Mn3O4 and MnO and the diameters of nanoparticles are between 5-10 nm and 15-60 nm in O2 atmosphese.