Heckel John C, Kisley Lydia M, Mannion Joseph M, Chumanov George
Department of Chemistry, Center for Optical Materials Science and Engineering Technology, Clemson University, Clemson, South Carolina 29634, USA.
Langmuir. 2009 Sep 1;25(17):9671-6. doi: 10.1021/la900829z.
Binary polymer nanoparticles were synthesized by the reprecipitation of poly(4-vinylpyridine) in the presence of poly(diallyldimethylammonium chloride) and further used to make polymer-coated Ag nanoparticles. Polymer shells around Ag nanoparticles were formed by two methods: the reduction of Ag(2)O in the presence of the polymer nanoparticles and by mixing the polymer nanoparticles with already-made Ag nanoparticles. The resulting nanoparticles were coated with layers of the two polymers with the hydrophilic polymer on the outside providing their stability in water. The exposure of the polymer-coated Ag nanoparticles to unmodified Ag nanoparticles resulted in spontaneous self-assembly due to the electrostatic attraction. The polymer-coated nanoparticles and the nanoparticle assemblies were characterized by UV-vis, surface-enhanced Raman scattering spectroscopy, and transmission electron microscopy.
通过在聚（二烯丙基二甲基氯化铵）存在下使聚（4-乙烯基吡啶）再沉淀来合成二元聚合物纳米颗粒，并进一步用于制备聚合物包覆的银纳米颗粒。银纳米颗粒周围的聚合物壳通过两种方法形成：在聚合物纳米颗粒存在下还原Ag(2)O以及将聚合物纳米颗粒与已制备的银纳米颗粒混合。所得纳米颗粒用两种聚合物层包覆，外侧的亲水性聚合物使其在水中具有稳定性。由于静电吸引，聚合物包覆的银纳米颗粒与未改性的银纳米颗粒接触会导致自发自组装。通过紫外可见光谱、表面增强拉曼散射光谱和透射电子显微镜对聚合物包覆的纳米颗粒和纳米颗粒聚集体进行了表征。
