Ag@Fe_3O_4@C-CdTe@SiO_2磁性荧光复合微球的制备与光学特征（英文）  

Magnetic and Optical Properties of Ag@Fe_3O_4@C-CdTe@SiO_2 Hybrid Nanoparticles

作　　者：沈茂[1] 陈素清[1] 贾文平[1] 金燕仙[1] 梁华定[1] SHEN Mao CHEN Su-qing JIA Wen-ping JIN Yan-xian LIANG Hua-ding(College of Pharmaceutical and Chemical Engineering, Taizhou University, Taizhou 317028, China)

机构地区：[1]台州学院医药化工学院,浙江台州317028

出　　处：《发光学报》2017年第3期274-280,共7页Chinese Journal of Luminescence

基　　金：浙江省应用化学重点学科,台州学院;国家自然科学基金(21403150);浙江省教育厅科研基金(Y201224099)资助项目~~

摘　　要：先采用一步溶剂热法和水热法制备了碳包覆的Ag@Fe_3O_4核壳型磁性纳米粒子,然后通过表面氨基化改性后与巯基乙酸修饰的CdTe量子点反应,将量子点键合到磁性微球上,最后在其表面包覆上一层二氧化硅壳层,制备出具有荧光增强的Ag@Fe_3O_4@C-CdTe@SiO2磁性荧光复合材料。实验结果表明,该纳米粒子的平均粒径大约为150nm,磁饱和强度为224A/g(22.4emu/g),在室温下具有较好的磁性能。其中Ag@Fe_3O_4@C-CdTe磁性荧光纳米粒子的荧光强度大于Fe_3O_4@C-CdTe,其主要原因是内核为45nm的Ag纳米粒子具有表面等离子体共振作用,能够使其表面或附近的量子点荧光得到增强。Novel hybrid nanoparticles Ag@ Fe304@ C-CdTe@ SiO2 were prepared. The synthesis method is includ- ed of a Fe3 04 magnetic embedded Ag core （ Ag@ Fe3O4 ） , an interlayer of carbon modified by PEI to form sufficient amounts of amine functional groups （ Ag@ Fe3O4 @ C-PEI） , the grafting of CdTe quantum dots （QDs） on the surface of Ag@ Fe304@ C-PEI （Ag@ Fe3O4@ C-CdTe） , and an ordered SiOz structured shell. The nanocomposites possess an average diameter of 150 nm, orange emission feature and the saturation magnetization of 224 A/g （22.4 emu/g） , which has room temperature ferro-magnetism. The photoluminescenee measurement reveals that the fluorescence of Ag@ Fe3O4@ C-CdTe nanostructnres in this composite with the Ag cores of about 45 nm has more enhancement com- pared with that of Fe3O4@ C-CdTe nanostructures due to the strong surface plasmonic resonance of the Ag cores.

关 键 词：多功能纳米粒子 贵金属 荧光增强 核壳结构 

分 类 号：O61[理学—无机化学] O482.31[理学—化学]