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本文采用激光蒸凝法 ,以 15 0WCWCO2 激光器为光源 ,金属Zn为靶材 ,成功地制备出了Zn和ZnO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、EDTA滴定分析等技术对纳米粒子的性能进行了表征。实验结果表明 ,制备工艺条件对形成的纳米粒子有一定的影响 ,反应压力和载气流量影响纳米粒子的形貌。不同的反应气氛制备的产物不同 ,在惰性气氛下产品纳米粒子是Zn和ZnO的混合物 ,粒径较大 (平均约为 6 0nm)且不均一 ,较大的粒子呈单一球形 ,分散性好 ,约为 12 0nm ;较小的粒子 ( 35nm)相互连接 ,分散性不好 ;而在氧气气氛下 ,所得的纳米粒子是纯ZnO ,粒子为针形 ,其长约为 75nm ,宽约为 10nm ,分散性也较好 ;在氢气气氛中得到较纯的Zn纳米粒子 ,粒径较小 (平均约为 2 3nm)且较均一 ,粒子呈单一球形 ,分散性好。该法具有较好的工业应用前景
In this paper, Zn and ZnO nanoparticles were successfully prepared by laser vaporization method using 15W CWW2 laser as the light source and Zn as the target. The effects of reaction parameters on the properties of nanoparticles were investigated. The properties of the nanoparticles were characterized by X-ray diffraction, electron diffraction, transmission electron microscopy and EDTA titration. The experimental results show that the preparation conditions have a certain impact on the formation of nanoparticles, reaction pressure and carrier gas flow affect the morphology of nanoparticles. The products prepared under different reaction atmospheres are different. Under inert atmosphere, the product nanoparticles are a mixture of Zn and ZnO with a large particle size (about 600 nm on average) and inhomogeneous. The larger particles are single spherical with good dispersibility, About 12 0nm; smaller particles (35nm) connected to each other, poor dispersion; and in oxygen atmosphere, the resulting nanoparticles are pure ZnO, the particles are needle-shaped, about 75nm long and about 10nm wide, The dispersibility is also better; pure Zn nanoparticles are obtained in the hydrogen atmosphere, the particle size is smaller (average about 23nm) and more uniform, the particles are single spherical, good dispersion. The law has good prospects for industrial applications