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醇还原法制备银纳米线及其生长机制的探究

王 昀，陈雪梅*
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2017年 第36卷 第4期: 1000-6281（2017）04-0336-06     下载地址：

醇还原法制备银纳米线及其生长机制的探究

王  昀，陈雪梅*

（华东理工大学化工学院，超细粉末国家工程研究中心，上海200237 ）

摘要  本文以硝酸银(AgNO3)为银源，乙二醇(EG)为还原剂和溶剂，聚乙烯吡咯烷酮(PVP)为生长导向剂，氯化铜(CuCl2)为晶型诱导剂，采用多元醇还原法制取银纳米线。通过SEM、TEM、XRD、XPS和UV-vis等测试方法，分析了银纳米线的生长机制，并探讨了PVP辅助银纳米线定向生长的具体原理。研究结果表明，银纳米结构是在五边孪晶晶种上定向生长为一维的纳米线，PVP中的氧原子会与纳米银表面的银原子产生强烈的相互作用来控制着银纳米线的单向生长过程，并且当PVP与AgNO3的摩尔浓度比为6时可制取形貌规整、长度超过60 um的银纳米线。

关键词  银纳米线；醇还原法；生长；PVP

中图分类号：0613.71；TB383；TG115.21+5.3     文献标识码：A   doi:10.3969/j.issn.1000-6281.2017.04.006

 

Study on the preparation of silver nanowires by polyol method and the growth mechanism

WANG Yun, CHEN Xue-mei*

(East China University of Science and Technology, National Engineering Research Center of Ultrafine Power,Shanghai 200237，China)

Abstract   Silver nanowires (AgNWs) was prepared by the polyol process with ethylene glycol as the solvent and reducing agent, silver nitrate(AgNO3) as the source of silver, polyvinyl pyrrolidone (PVP) as wire-directing agent, copper chloride (CuCl2) as seed inducer. In addition, the paper studied the growth mechanism and the influence of PVP on the form and size of AgNWs by SEM, TEM, XRD, XPS and UV-vis methods. The experimental results showed that silver nanowires are oriented one-dimensional on five-sided twin crystal seeds. The one-dimensional growth process of the AgNWs was controlled by the stronginteraction between the oxygen atoms of PVP and the Ag atoms on the surface of silver nanoparticles, especially under the condition of the mole ratio of PVP and AgNO3 at 6，the AgNWs with uniform form and with length higher than 60um can be produced．

Keywords  silver nanowires；polyol method；growth；PVP  

 

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