摘要
采用水热法,不添加任何还原剂,在表面活性剂聚乙烯吡咯烷酮(polyvinyl pyrrolidone,PVP)的保护下,热分解碳酸银制得纳米银溶胶.将纳米银溶胶经过后续离心分离,干燥后得到纳米银粉.通过改变反应温度、反应时间、表面活性剂浓度、种类及反应物浓度等反应条件,分析了各反应条件对纳米银粒子形貌的影响.利用X射线衍射仪(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)和电子能谱仪(energy dispersivespectroscopy,EDS)分析表明,在反应温度为180℃、反应时间为5 h、AgNO3浓度为0.1 mol/L、NaHCO3浓度为0.05mol/L、PVP为1.7 g的最佳制备工艺条件下,纳米银粒子为球形,粒径分布范围窄,单一分散,粒径40 nm左右.结果表明,表面分散剂PVP以及AgNO3与NaHCO3的浓度对球形纳米银的合成具有关键作用.
Colloidal silver nanoparticles were prepared by decomposing silver carbonate with hydrothermal method in the presence of polyvinyl pyrrolidone(PVP) as protecting agent and without any reducing agent,which were then centrifugally separated and dried to produce nanometer silver powder.Effects of the reaction conditions on the morphology and growth of silver nanoparticles were analyzed by variation of the reaction temperature,time,surfactant concentration,kind and the reagent concentration.Analysis with X-ray ...
出处
《纳米技术与精密工程》
EI
CAS
CSCD
2010年第4期295-299,共5页
Nanotechnology and Precision Engineering
基金
中国博士后基金资助项目(20060390878)
湖南省博士后基金资助项目(2007RS4024).
关键词
纳米银粒子
水热法
制备
热分解
silver nanoparticle
hydrothermal method
preparation
thermal decomposition
