高长径比高纯纳米银线的制备

摘要

将多元醇还原法和晶种法相结合,以硝酸银为银源、乙二醇为还原剂和溶剂、聚乙烯吡咯烷酮为生长导向剂,通过添加氯化铜作为晶型诱导剂引入晶种来制备高长径比高纯纳米银线.探讨晶型诱导剂浓度、PVP与AgNO3的摩尔比、晶种生长时间以及体系搅拌速度等反应条件对银线形貌的影响.结果表明:在170℃下,当CuCl2浓度为0.15 mmol/L、PVP与AgNO3的摩尔比为6:1、晶种生长时间控制为10 min、搅拌速度为400 r/min时,可制取长度超过50μm、直径介于80~100 nm、长径比超过500的纳米银线.%Silver nanowires (AgNWs) with high aspect ratio and high purity was produced by polyol method combined with seed-growth through employing process with ethylene glycol as solvent and reducing agent, silver nitrate as silver source, polyvinyl pyrrolidone (PVP) as wire-directing agent and copper chloride (CuCl2) as seed inducer. The effects of the concentration of seed inducer, the molar ratio of polyvinyl pyrrolidone (PVP) to silver nitrate (AgNO3), time of seed-growth and the stirring rate on the morphology and size of AgNWs were investigated. The results show that AgNWs with length over 50 μm, diameter ranging from 80-100 nm and aspect ratio over 500 are prepared when the concentration of CuCl2 is 0.15 mmol/L, the molar ratio of PVP to AgNO3 is 6, the growing time of seed is 10min and the stirring speed is 400 r/min at 170 ℃.