Eu3+ and Tb3+ complexes based on an organo-alkoxysilane derived from 4-azido dipicolinic acid by âclick chemistryâ were coated onto silica nanoparticles previously prepared by the water in oil emulsion method. Structural and optical properties of the resulting luminescent coreâshell monodisperse (30 nm) nanohybrids were fully characterized by infrared and Raman spectroscopies as well as by electron microscopy. Fluorescence spectroscopy evidenced that an efficient ligand-to-Ln3+ energy transferâboth in the mono- and biphotonic modesâoccurs. Furthermore, surface modification by amino groups was realized, paving the way for nanotags of biological interest.
基于4-
叠氮基二
吡啶酸的有机烷氧基
硅烷衍
生物的Eu3+和Tb3+络合物通过“点击
化学”方法涂覆在之前通过
水包油乳液法制备的
二氧化硅纳米颗粒上。所得到的发光核壳单分散(30纳米)纳米混合物的结构和光学特性通过红外光谱和拉曼光谱以及电子显微镜进行了全面表征。荧光光谱显示,发生了高效的
配体向Ln3+的能量转移——无论是在单光子模式还是双光子模式下。此外,进行了
氨基表面修饰,为
生物相关的纳米标签铺平了道路。