Preparation Of Rare Earth Composite Nanoparticles And Their Application

It is well-known that the complexes of Tb3+ and Eu3+ have excellent luminescence properties including larger stokes shift, narrow emission profiles and a long fluorescence lifetime. In addition, organic macromolecules feature favorable stability and convenient preparation. So we envisage that these kinds of composite nanoparticles can be used as the fluorescence probes for the determination of trace substance with good sensitivity and selectivity.In this paper, nano-Tb / acac and Eu / TTA have been successfully prepared. The nano-Tb / acac has been modified with AA and AM, respectively, and nano- Eu / TTA has been modified with AA under ultrasonic irradiation in water solution. The functionalized nanoparticles are well stable in the water. All the nanoparticles have been characterized by Fluorescence spectra and TEM images. Based on the fluorescence quenching of Tb / acac / PAA by Vc, Tb / acac / PAM by Cr(â…¥)and Eu / TTA / PAA by DNA. We used them as fluorescence probes in the determination. Under the optimum conditions, linear calibration graph were obtained. The methods in this paper proved to be simple, rapid, and specific, and the recovery and relative standard deriation are very satisfactory.