title: Simple and sensitive detection method for Cobalt(II) in water using CePO4:Tb3+ nanocrystals as fluorescent probes.
abstract: A simple and sensitive method for detecting cobalt by synchronous fluorescence spectrometry technique with a novel fluorescence probe CePO4:Tb(3+) has been developed. CePO4:Tb(3+) nanocrystals were synthesized in aqueous solutions and characterized by transmission electron microscopy, electron diffraction pattern spectroscopy and spectrofluorometry. When Δλ=210 nm, the selected synchronous fluorescence is produced at 284 nm. CePO4:Tb(3+) nanocrystals were negatively charged under weakly basic conditions (pH=8.2), which can interact with Co(2+) via electrostatic interaction. Moreover, there is the spectrum overlap between the emission wavelength of CePO4:Tb(3+) NCs and the absorbance of Co(2+). So the energy transfer would occur, leading to the quenching phenomenon. The quenching equation of the system was agreed with the Stern-Volmer equation. The linear range and detection limit of Co(2+) were 5-1.8 μM and 3.5 nM, respectively. The method is successfully applied to the quantification of Co(2+) in water samples.
authors: Anhui Key Laboratory of Chemo-Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, PR China.
authors: Hongqi
authors: H
authors: Chen
authors: Fei
authors: F
authors: Yuan
authors: Juan
authors: J
authors: Xu
authors: Yiyang
authors: Y
authors: Zhang
authors: Yong
authors: Y
authors: Wu
authors: Lun
authors: L
authors: Wang
mesh_terms: D002412:Cations / Q000737:chemistry; D002563:Cerium / Q000737:chemistry*; D003035:Cobalt / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000191:economics / Q000379:methods; D013725:Terbium / Q000737:chemistry*; D014867:Water / Q000032:analysis*
chemical_list: D002412:Cations; D005456:Fluorescent Dyes; D010710:Phosphates; D014867:Water; D013725:Terbium; D002563:Cerium; D003035:Cobalt; C048083:cerium phosphate