Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran.
Talanta. 2013 Oct 15;115:271-6. doi: 10.1016/j.talanta.2013.04.010. Epub 2013 Apr 30.
A novel Eu(3+)-sensitive fluorescent chemosensor is introduced. It is based on magnetic core-shell silica nanoparticle which is functionalized by Cinchonidine (CD-Fe3O4@SiO2). The nano-chemosensor was synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), scanning electron microscopy (SEM), UV-visible absorption and fluorescence emission. The fluorescent nano-chemosensor shows a selective interaction with Eu(3+) ion. Fluorescence studies revealed that the emission intensity of the functionalized magnetic core-shell silica nanoparticles (CD-Fe3O4@SiO2 NPs) increases significantly by addition of various concentrations of Eu(3+) ion. While in case of mono, di, and other trivalent cations, weak changes or either no changes in intensity were observed. The enhancement in fluorescence intensity of nano-chemosensor is because of the strong covalent binding of Eu(3+) ion to CD-Fe3O4@SiO2 NPs with a large binding constant value of 1.7 × 10(5) mol L(-1).
介绍了一种新型 Eu(3+) 敏感荧光化学传感器。它基于磁性核壳二氧化硅纳米粒子，该粒子由辛可宁（CD-Fe3O4@SiO2）功能化。通过傅里叶变换红外光谱（FT-IR）、热重分析（TGA）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、紫外-可见吸收和荧光发射对纳米化学传感器进行了合成和表征。荧光纳米化学传感器与 Eu(3+) 离子表现出选择性相互作用。荧光研究表明，功能性磁性核壳二氧化硅纳米粒子（CD-Fe3O4@SiO2 NPs）的发射强度通过添加各种浓度的 Eu(3+)离子显著增加。而在单核、双核和其他三价阳离子的情况下，观察到强度的微弱变化或没有变化。纳米化学传感器荧光强度的增强是因为 Eu(3+) 离子与 CD-Fe3O4@SiO2 NPs 之间的强共价结合，其结合常数值为 1.7×10(5)mol L(-1)。
