离子液体超声辅助制备纳米CdSe及其荧光性能

Synthesis and Fluorescence of Nanoparticales CdSe by Ultrasonic Assisted ionic liquid method

摘要:

采用离子液体超声辅助合成了CdSe纳米颗粒，用X射线衍射仪(XRD)、扫描电镜(SEM)、荧光分光光度计对纳米颗粒进行了表征。XRD结果显示产物具有立方晶系结构，随着反应时间的增加，产物的结晶度逐渐提高。讨论了[Bmim]OH–H2O离子液体、反应时间对产物的形貌以及荧光性能的影响。在1 ml [Bmim]OH–H2O溶液中，超声反应1 h，所得产物的直径约为30～60 nm，荧光强度达到54以上。离子液体在纳米颗粒表面形成一种保护膜，有效地阻止了颗粒之间的团聚，提高了产物的荧光性能。

Abstract:

CdSe nanoparticles have been prepared by ultrasonic assisted ionic liquid method and characterized by XRD, SEM and fluorescence spectroscopy. XRD spectrum demonstrates the product is a cubic phase of well–crystallized CdSe and the crystallinity increases with increasing reaction time. The effects of ionic liquid of [Bmim]OH–H2O and reaction time on microstructure and fluorescence of the CdSe were studied. The diameter of CdSe nanoparticles synthesized in 1 ml [Bmim]OH–H2O solution (ultrasonic irradiation, 1 h)is 30-60 nm and fluorescence intensity achieves 54 a.u.. CdSe nanoparticles could be enhanced by the method of being coated with ionic liquid to prevent the aggregation of nanoparticles.