(北京化工大学 可控化学反应科学与技术基础教育部重点实验室，北京 100029)
摘 要: 以锌粒或醋酸锌为靶材，以单模100 W CW CO2激光器为光源，采用激光蒸凝法在氢气气氛下制备出不同形貌的锌纳米晶。研究了反应参数对纳米晶形貌的影响，并用X射线衍射、透射电镜、电子衍射和EDTA滴定分析技术对纳米晶的性质进行表征，同时对纳米晶的形成机理进行了探讨。实验结果表明，靶材的种类、反应压力、反应气体的流量等因素对纳米晶的粒度和晶型等性能均有影响。通过改变实验参数，可以得到不同性质的锌纳米晶，从而实现锌纳米晶的可控制备。
关键字: 锌； 纳米晶； 激光蒸凝法
by laser ablation
（ Key Lab for Science and Technology of Controllable Chemical Reactions,
Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China）
Abstract: Zn nanocrystals with different morphologies were prepared in the atmosphere of H2 by laser heating gas-evaporation method with 100 W CO2 laser. The laser target was made of Zn particles or the powder of Zn(Ac)2·2H2O. The Zn nanocrystals were characterized by XRD, TEM, ED and EDTA complexo-metrictitration. The mechanism of reaction was discussed. The experimental results show that the process parameters such as the kind of target, reaction pressure， the sorts and rate of airflow affect the shape and the size of nanocrystals. Different nanocrystals with all kinds of characters can be obtained by changing the process parameters. As a result, the controllable preparation of Zn nanocrystals can be reached.
Key words: Zn; nanocrystals; laser ablation
