化学镀法合成纳米银包覆SnO_2粉体  

Synthesis of SnO_2 Powder Coated With Silver by Electroless Plating Method

作　　者：乔秀清 申乾宏[1,2] 张启龙[1] 陈乐生[3,2] 樊先平[1,2] 杨辉[1,2] 

机构地区：[1]浙江大学材料科学与工程学系,杭州310027 [2]浙江大学浙江加州国际纳米技术研究院,杭州310029 [3]温州宏丰电工合金股份有限公司,浙江温州325603

出　　处：《电工材料》2012年第3期7-10,共4页Electrical Engineering Materials

摘　　要：利用银镜反应制备纳米银包覆SnO2粉体,考察了硝酸银溶液浓度、反应时间、SnO2粉体粒径等因素对复合粉体结构形貌的影响。结果表明,降低银镜反应速率有利于纳米银在SnO2粉体表面的包覆,优化的反应条件为:AgNO3浓度0.005 mol/L、以乙醇稀释甲醛溶液、pH值为10、反应温度45℃、反应时间1 h。SnO2粉体粒径对最终复合粉体中纳米银的包覆形貌有较大影响,当SnO2为微米级粉体时,纳米银在SnO2颗粒表面形成均匀的包覆层;当SnO2为纳米级粉体时,纳米银与纳米SnO2颗粒彼此连接,形成尺寸更大的聚集体。SnO2 powder coated with sliver was prepared by silver mirror reaction. In the reaction process, the influences of parameters such as the concentration of silver nitrate solution, reaction time and the particle size of SnO2 powder on the surface morphology of composite were studied. Results show that reducing the reaction rate of silver mirror reaction is beneficial to the coating of nano silver particle on the surface of SnO2 powder. The optimized parameters are： the concen- tration of AgNO3 is 0.005 mol/L, formaldehyde solution is diluted by ethanol, pH is 10, reaction temperature is 45℃ and reaction time is lh. The grain size of SnO2 powder has great influence on the morphology of final nano-silver coated composite powder. When the grain size of SnO2 is in micrometer scale, SnO2 particle is coated with nano silver and form even surface layer, while when the grain size of SnO2 is in nanometer scale, nano silver and nano SnO2 particle connecte with each other, forming bigger aggregates.

关 键 词：SnO2粉体 银 纳米包覆 化学镀法 

分 类 号：TM205.1[一般工业技术—材料科学与工程]