PVP为偶联剂制备核壳型PS/CdS纳米复合粒子及表征

Synthesis and Characterization of Core-Shell Type PS/CdS Nanocomposite Particles by Using PVP as Coupling Agent

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。

Core-shell type polystyrene （PS）/CdS nanocomposite particles （CSNPs） were synthesized by facile ultrasonic method using polyvinylpyrrolidone （PVP） as surfactant. In order to in-depth understand the formation mechanism and interracial behavior of the core-shell type microscopic particle, a variety of reaction parameters such as PVP, the order of adding precursors, the mole ratio of Cd2＋/82-, as well as the reaction time were carefully investigated. The results show that the PVP is the controlling parameters. The amphiphilic PVP can improve the affinity between CdS nanoparticles and the polymeric matrix, CdS NPs and PS microspheres are successful bonded to form the monodisperse three-dimensional PS/CdS core-shell structure with complete and continuous shell and their shell thickness could be controlled. UV-visible DRS spectra indicate that PS/CdS CSNPs have the higher visible light response activity than pure CdS. Also, the present PVP-assisted route might be generalized to synthesize other core- shell type nanocomposites with polar and nonpolar materials.