山莓形铑纳米晶的控制合成

摘要

Using Na3RhCl6as a precursor,ascorbic acid(AA)as a morphological control agent,polyvinylpyr-rolidone(PVP)as a stabilizer,and triethylene glycol(TG)as both a solvent and a reducing agent,we synthe-sized raspberry-like rhodium nanocrystals,and characterized their structures by TEM,SEM,XRD,and XPS.The results show that we can obtain uniform and well-defined raspberry-like rhodium nanocrystals with an average particle size of 40 nm by adjusting the reaction parameters.The optimum reaction conditions are as follows:the molar ratio of Na3RhCl6,PVP,and AA is 1:1 0:5 0,the reaction temperature is 1 4 5 ℃,and the reaction time is 3 h.%以 Na3RhCl6为前驱体、抗坏血酸(AA)为形貌控制剂、聚乙烯吡咯烷酮(PVP)为稳定剂、二缩三乙二醇(TG)为溶剂和还原剂,控制合成了山莓形 Rh纳米晶,通过TEM、SEM、XRD、XPS等对其结构进行了表征.结果表明,通过调节反应参数,可以合成得到形貌单一、平均粒径约40 nm的山莓形 Rh纳米晶.最适反应条件为:Na3RhCl6、PVP和 AA物质的量比为1:10:50,反应温度为145 ℃,反应时间为3 h.