(北京化工大學(xué) 可控化學(xué)反應(yīng)科學(xué)與技術(shù)基礎(chǔ)教育部重點(diǎn)實(shí)驗(yàn)室，北京 100029)
摘 要: 以鋅粒或醋酸鋅為靶材，以單模100 W CW CO2激光器為光源，采用激光蒸凝法在氫氣氣氛下制備出不同形貌的鋅納米晶。研究了反應(yīng)參數(shù)對(duì)納米晶形貌的影響，并用X射線衍射、透射電鏡、電子衍射和EDTA滴定分析技術(shù)對(duì)納米晶的性質(zhì)進(jìn)行表征，同時(shí)對(duì)納米晶的形成機(jī)理進(jìn)行了探討。實(shí)驗(yàn)結(jié)果表明，靶材的種類、反應(yīng)壓力、反應(yīng)氣體的流量等因素對(duì)納米晶的粒度和晶型等性能均有影響。通過(guò)改變實(shí)驗(yàn)參數(shù)，可以得到不同性質(zhì)的鋅納米晶，從而實(shí)現(xiàn)鋅納米晶的可控制備。
關(guān)鍵字: 鋅； 納米晶； 激光蒸凝法
by laser ablation
LI Duo, GUO Hong-you
（ 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
