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以聚乙烯吡咯烷酮(PVP)为偶联剂,利用超声化学法制备了PS/CdS核壳型复合纳米粒子。为了深入理解核壳型纳米粒子的界面行为和形成机制,详细考察了PVP加入与否及用量、前体加入顺序、Cd2+与S2-摩尔比和反应时间等实验参数对核壳复合材料结构的影响。结果表明,适量PVP可改善CdS纳米粒子与PS聚合物基体间的亲和性,增强壳与核之间的相互作用,成功地将PS与CdS复合成单分散的、壳层完整且厚度可控的三维核壳型PS/CdS纳米复合粒子;且复合物比纯CdS粒子具有更高的可见光响应活性。
PS / CdS core-shell composite nanoparticles were prepared by sonochemistry using polyvinylpyrrolidone (PVP) as coupling agent. In order to understand the interfacial behavior and formation mechanism of core-shell nanoparticles, the effect of PVP addition or not, the order of precursor addition, Cd2 + and S2-molar ratio and reaction time on the structure of core-shell composites . The results showed that the appropriate amount of PVP can improve the affinity between the CdS nanoparticles and the PS polymer matrix and enhance the interaction between the shell and the core. PS and CdS were successfully combined into monodisperse, the shell was complete and the thickness was controllable Of the three-dimensional core-shell PS / CdS nanocomposite particles; and complexes with pure CdS particles have a higher visible light response activity.