Size control and its mechanism of SnAg nanoparticles  

SnAg纳米粒子的尺寸控制及其机制（英文）

作　　者：张卫鹏[1,2] 邹长东[2,3] 赵炳戈[1,2] 翟启杰[2] 高玉来[1,2] 

机构地区：[1]上海大学微结构实验室,上海200436 [2]上海大学材料科学与工程学院,上海200072 [3]江苏省(沙钢)钢铁研究院,张家港215625

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第3期750-757,共8页中国有色金属学报（英文版）

基　　金：Projects(50971086,51171105)supported by the National Natural Science Foundation of China

摘　　要：Sn3.5Ag （mass fraction, %） nanoparticles were synthesized by an improved chemical reduction method at room temperature. 1,10-phenanthroline and sodium borohydride were selected as the surfactant and reducing agent, respectively. It was found that no obvious oxidation of the synthesized nanoparticles was traced by X-ray diffraction. In addition, the results show that the density of primary particles decreases with decreasing the addition rate of the reducing agent. Moreover, the slight particle agglomeration and slow secondary particle growth can result in small-sized nanoparticles. Meanwhile, the effect of surfactant concentration on the particle size can effectively be controlled when the reducing agent is added into the precursor at an appropriate rate. In summary, the capping effect caused by the surfactant molecules coordinating with the nanoclusters will restrict the growth of the nanoparticles. The larger the mass ratio of the surfactant to the precursor is, the smaller the particle size is.采用一种改进的化学还原法,在室温下合成Sn3.5Ag(质量分数,%)纳米颗粒。实验所用表面活性剂和还原剂分别为邻啡罗琳和硼氢化钠。X射线衍射分析表明所合成的纳米粒子没有明显的氧化现象。结果表明:在反应物浓度较小时,产生的一次粒子较少,团聚及二次粒子生长程度较小,纳米颗粒的尺寸也随之减小。当以某一合适的速率添加还原剂到前驱体溶液中时,表面活性剂浓度对纳米颗粒尺寸起到控制作用。由于表面活性剂分子可以与纳米团簇之间产生配位作用,因此可以抑制纳米颗粒的长大。表面活性剂与前驱体溶液质量的比值越大,得到的纳米颗粒尺寸越小。

关 键 词：Sn3.5Ag size control NANOPARTICLES chemical reduction method 

分 类 号：TB383.1[一般工业技术—材料科学与工程]