P(S-SS)/CdS核壳粒子的制备与表征

THE PREPARATION AND CHARACTERIZATION OF P(S-SS)/CdS Core-Shell Particles

采用超声辐照乳液聚合得到聚(苯乙烯-苯乙烯磺酸钠)(P(S-SS))乳胶粒,用直接沉淀法在乳胶粒表面原位生成硫化镉(CdS)纳米粒子,得到P(S-SS)/CdS核壳粒子。用元素分析和XPS研究了共聚物的组成及磺酸基(-SO3-)的分布,结果表明,-SO3-主要分布在乳胶粒表面,有利于CdS纳米粒子在乳胶粒表面的沉积。用XRD、TEM及UV-v is表征了共聚物乳胶粒及P(S-SS)/CdS核壳粒子的结构及CdS的量子效应。结果表明,所制备的CdS纳米粒子为六方晶型,平均粒径为6 nm,在P(S-SS)乳胶粒外层形成多层包覆,P(S-SS)/CdS核壳粒子平均粒径为70 nm,CdS纳米粒子表现出明显的量子尺寸效应。

P（styrene-co-sodium styrene sulfonate） （P（S-SS）） latex with small parucle size about 40nm and narrow size distribution were prepared through ultrasonically initiated emulsion polymerization. Then, CdS nanoparticles in-situ formed on the surface of P（S-SS） latex, resulting in P（S-SS）/CdS core-shell nanocomposites. Element analysis and XPS results show that the sulfonate group mainly arranges on the surface of copolymer latex, which benefits the formation of CdS nanoparticles on the surface of P（S-SS） latex. XRD patterns confirm the formation of about 6nm hexagonal CdS nanocrystal. TEM suggests that the average particle size of the resulted P（S-SS）/CdS core-shell nanoeomposites is around 70 nm. UV spectra indicates that the prepared CdS nanoparticles exhibit clear optical absorption and blue shift compared with the bulk CdS.