使用多元醇热还原法制备出了具有大长径比的银纳米线,研究了银纳米线的生长过程并分析了其生长机制。实验选择不同的还原剂种类、不同分子量的PVP及成核控制剂进行了研究。优化了AgNO3的浓度、反应温度和时间等工艺参数,得到了乙二醇体系下制备出银纳米线的最佳实验方案,其优化工艺参数为2mmol/L硫化钠乙二醇溶液、0.19～0.25g PVP、50mmol/L硝酸银乙二醇溶液。对所得银纳米线的形貌和结构进行了系统的表征。结果表明,产物为面心立方结构的纯银纳米线,产物结晶度好、尺寸形貌均匀、长度为100～200μm、直径为60～100nm。按此方案进行放大制备,得到的银纳米线仍然保持良好的形貌尺寸,且产量高、工艺稳定,具有量产的可能。
Silver nanowires with high aspect ratio were prepared by polyol-thermal method.The growth process of silver nanowires was studied and the growth mechanism was analyzed.The different kinds of reducing agents,the molecular weight of PVP and the nucleation control agent were studied.The optimum experimental conditions for the preparation of silver nanowires under ethylene glycol system were optimized.The optimum parameters were as follows:2mmol/L sodium sulfide glycol solution,0.24g PVP,50mmol/L silver nitrate glycol solution.The morphology and structure of obtained silver nanowires were systematically characterized.The results showed that the product was a pure silver nanowire with a face-centered cubic structure.The silver nanowires had good crystallinity and uniform size,with a length of 100～200μm and a diameter of 60～100nm.According to this program to enlarge the preparation,the silver nanowires were still maintain a good shape of the size,and the yield of nanowires was high.It was possible for mass production.
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基金资助
国家863计划项目(2015AA021003);国家自然科学基金资助项目(21276220);大学生创新创业训练计划项目(201610305001Z)
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