Fe_3O_4/CdS纳米复合微粒的合成及性能研究

Preparation and property of Fe_3O_4/CdS hybrid nanoparticles

用反相微乳液法合成Fe3O4／CdS纳米复合微粒。用UV—Vis、PL、VSM和TEM对产物进行了表征，并对其结合机理进行了简单分析，认为主要以化学键结合和表面类齿轮切合作用所致。还研究了不同的合成条件对复合材料性能的影响。结果表明，随着微乳液水核尺寸增大，荧光发射光谱逐渐红移，同时壳层厚度先增后减。复合材料中磁性组份比重过大会引起荧光的迅速减弱，磁性先驱物与量子点先驱物物质的量比为0．25～0．5时比较合适。

A hybrid material consisting of magnetic nanoparticles （MPs） and quantum dots （QDs） was synthesized by using reverse micelle method. VSM, UV absorption spectra,PL and TEM were used to characterize the sample. The conjugation mechanism was briefly discussed. The influence of the reaction conditions on the properties of Fe3O4/CdS was investigated. With increasing water droplet size, a PL emission across most of the visible spectrum demonstrate a systematic red - shift in wavelength. And the shell thickness of the hybrid material is also influenced by the change of water droplet size. In addition, a notable photoluminescence （PL） intensity dropping is observed in the hybrid material with introducing more MPs. According to that,the tool ratio between the MP and QD precursor is better adjusted to 0.25 -0.5.