摘要
介绍了如何在聚苯乙烯(PS)微球表面均匀地修饰银纳米颗粒(Ag NPs)。采用PS微球的磺化处理、籽晶修饰的方法,通过低温下的银镜反应,结合超声波在金属纳米材料制备过程中独特的剪裁作用,制备出PS/Ag核壳型复合微球,用扫描电子显微镜(SEM)和透射电子显微镜(TEM)对样品进行表征。结果表明,20℃下,磁力搅拌反应所制备的样品,PS微球表面形成了致密的Ag包裹层;由超声化学法所制备的样品,PS微球表面的银颗粒呈岛状分散分布。反应温度为0℃时,由超声化学法制备的PS微球表面较均匀分布着AgNPs,随着反应时间及反应液浓度的变化,纳米Ag颗粒的大小及形貌有明显变化,PS球表面的Ag NPs较均一的条件为:反应时间5min,二次银氨溶液的浓度0.1~0.025mol/L,葡萄糖溶液的浓度为0.6~0.3mol/L。
How to evenly modify silver nanoparticles （Ag NPs） on the surface of polystyrene （PS） microsphere was introduced. By the method of sulfonated processing of PS mierospheres, seeds modification and the silver mirror reaction under low temperature, combined with the unique tailoring of ultrasonic wave in the process of preparing metal nanometer materials,PS/Ag cor^shell composite microspheres were prepared successfully. The samples were characterized by scanning electron microscope （SEM） and transmission electron microscopy （TEM）. The results showed that, at 20 ℃, the sample prepared by magnetic stirring reaction, a dense silver nanoparticle layer is formed on the surface of the PS microspheres. Samples prepared by ultrasonic chemical reaction, silver nanoparticles distributed on the surface of PS microspheres like many islands. At 0 ℃, island shaped Ag NPs distributed uniformly on the surface of PS microspheres; the reaction time and the concentration of the reaction solution were changed, the size and morphology of Ag NPs are obviously changed, under the following reaction conditions the Ag NPs are more uniform： the reaction time is 5 min, the secondary silver ammonia solution concentration is 0. 1-0. 025 mol/L, the concentration of glucose solution is 0.6-0. 3 mol/L.
基金
国家自然科学基金(61371057)
关键词
银镜反应
籽晶修饰
聚苯乙烯
磺化反应
silver mirror reaction, seeds modification, polystyrene, sulfonation
