PS/Ag核壳结构复合微球的制备与性能
Synthesis and properties of core-shell PS/Ag microspheres
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摘要: 以乳液聚合法制备的平均粒径1.2～1.5 μm单分散聚苯乙烯（PS）微球为核，经过超声敏化、化学镀、还原等过程制备了PS/Ag核壳结构复合微球。采用透射电镜、X射线衍射、红外光谱、紫外可见光谱对其形貌、物相、结构与光学性质进行了表征与分析。结果表明：PS/Ag复合微球粒径相对均一；通过多次敏化、控制二次银氨溶液浓度（0.002～0.006 mol/L），可实现对纳米银壳层厚度的调控；纳米银壳层沉积生长过程中，随着PS微球表面银粒子的增多、增大，复合微球的光学等离子体共振吸收峰产生显著的展宽与红移。Abstract: Monodisperse polystyrene(PS) microspheres with average sizes of 1.2 to 1.5 μm were obtained by emulsion polymerization. Using PS microspheres as the cores, some PS/Ag core shell particles were prepared after ultrasonic sensitization, deoxidization and electroless process. Their morphology, component, structure and optical properties were characterized and investigated by transmission electron microscopy, X-ray diffraction, infrared ray, and UV-Vis adsorption spectra. The results indicate that the size distribution of the composite particles is narrow and the shell thickness of silver can be controlled by multiple sensitization and adjusting the second concentration of ［Ag(NH4)2］+, from 0.002 to 0.006 mol/L. In addition, while the silver nanoparticles coated on the polystyrene grows, the
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