聚苯乙烯/银核壳结构纳米微球的制备与表征

Preparation and characterization of PS/Ag core-shell nanoparticles

采用两步法的简单路线制备出银纳米粒子包覆的聚苯乙烯（PS）微球，首先通过乳液聚合法合成出聚苯乙烯微球；然后对苯乙烯进行敏化和活化，搅拌下加入银的还原液，从而制备出Ag-PS核壳结构的纳米微球。同时借助于TEM、UV-vis、FE-SEM进行表征，分析其微观结构。结果表明，所得的聚苯乙烯微球粒径约为40nm；聚苯乙烯／银核壳结构纳米微球粒径为45～350nm，银层厚度可随意调控。

A ＂two-step＂ process was developed to fabricate PS/Ag core-shell nanoparticles. Firstly PS microparticles prepared in latex are sensitize and activation. Then the liquid with Ag are added in the PS with unending stirring. At last PS/Ag core-shell nanoparticles are fabricated. The products were characterized by transmission electron microscopy（TEM）, field emission scanning electron microscopy （FE-SEM） and ultra violet-visible light speetrograph（UV-vis）. The results shows： The PS microparticles we prepared are only 40nm, PS/Ag coreshell Nanoparticles are 45-350nm, the shell of Ag can be controlled freely.