原位合成纳米银线-还原氧化石墨烯复合材料研究

In-situ synthesis of silver nanowires-reduced graphene oxide composites

采用改进的多元醇法,以氧化石墨烯(GO)作为石墨烯前驱体,硝酸银(AgNO_(3))为银源,聚乙烯吡咯烷酮为表面修饰剂,三氯化铁为抑制剂,乙二醇为溶剂和还原剂,在溶剂热条件下原位合成纳米银线(AgNWs)-还原氧化石墨烯(RGO)复合材料,研究反应溶液中GO∶AgNO_(3)质量比、反应温度和时间对合成产物形貌的影响,并对AgNWs-RGO复合材料的形成机理进行了分析。研究表明:当反应溶液中GO∶AgNO_(3)质量比在1∶98.5~1∶32.4内,产物以AgNWs-RGO复合材料为主;当反应溶液中GO∶AgNO_(3)质量比在1∶15.7~1∶7.3内,产物以银纳米颗粒和RGO复合材料为主;随着反应温度从150℃增加到170℃,产物中纳米银颗粒增多,纳米银线的平均长度减小;随着反应时间从3 h延长到5 h,产物中纳米银线的平均长度减小,数量增多。当反应溶液中GO∶AgNO_(3)质量比为1∶63.5时,溶液在160℃反应3 h,产物主要是AgNWs-RGO复合材料,其中纳米银线的长度在20~35μm,直径在80~110 nm,RGO覆盖在AgNWs上。

Silver nanowires(AgNWs)-reduced graphene oxide(RGO)composites were in-situ synthesized by an improved solvent thermal method,where graphene oxide(GO)was used as precursor of graphene,silver nitrate(AgNO_(3))as silver source,polyvinylpyrrolidone(PVP)as surfactant,ferric chloride as inhibitor,and ethylene glycol as solvent and reducing agent.The effects of the mass ratio of GO∶AgNO_(3),reaction temperature and time were studied on the morphology of the synthesized composites.The formation mechanism of AgNWs-RGO composite was analyzed as well.When the mass ratio of GO∶AgNO_(3) is from 1∶98.5 to 1∶32.4,the main product is AgNWs-RGO composite.When the mass ratio is from 1∶15.7 to 1∶7.3,separate silver nanoparticles and RGO composite were obtained.As reaction temperature increases from 150 to 170℃,the content of silver nanoparticles increases with reduced average length of the AgNWs.When reaction time increases from 3 to 5 hours,the average length of AgNWs decreases with increased concentration.When the mass ratio of GO∶AgNO_(3) is 1∶63.5 and the reaction occurs at 160℃for 3 h,the main product is AgNWs-RGO composite,where the AgNWs have length and diameter of 20-35μm and 80-110 nm respectively,and are covered by RGO.