Simple and sensitive detection method for Cobalt(II) in water using CePO4:Tb3+ nanocrystals as fluorescent probes
Simple and sensitive detection method for Cobalt(II) in water using CePO4:Tb3+ nanocrystals as fluorescent probes
复制标题
以 CePO4:Tb3 纳米晶为荧光探针简单灵敏地检测水中钴(II)的方法
DOI：
10.1016/j.saa.2013.01.020
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发表时间：
2013-04-15
影响因子：
4.4
通讯作者：
Wang, Lun
中科院分区：
文献类型：
--
作者：
Chen, Hongqi;Yuan, Fei;Wang, Lun
建立了一种新的荧光探针CePO 4：Tb 3+同步荧光光谱法测定钴的新方法。在水溶液中合成了CePO 4：Tb 3+纳米晶，并用透射电镜、电子衍射谱和荧光光谱对其进行了表征。当Δ λ = 210 nm时，在284 nm处产生所选择的同步荧光。CePO 4：Tb 3+纳米晶在弱碱性条件下（pH = 8.2）带负电荷，可与Co2+通过静电作用相互作用。CePO 4：Tb 3+纳米粒子的发射波长与Co 2+的吸收波长之间存在光谱重叠。因此，会发生能量转移，导致猝灭现象。体系的猝灭方程符合Stern-Volmer方程。Co ~（2+）的线性范围为5 ~ 1.8 μ M，检测限为3.5nM。该方法已成功地应用于水样中钴的定量。(C)2013爱思唯尔有限公司版权所有。
A simple and sensitive method for detecting cobalt by synchronous fluorescence spectrometry technique with a novel fluorescence probe CePO4:Tb3+ has been developed. CePO4:Tb3+ nanocrystals were synthesized in aqueous solutions and characterized by transmission electron microscopy, electron diffraction pattern spectroscopy and spectrofluorometry. When Delta lambda = 210 nm, the selected synchronous fluorescence is produced at 284 nm. CePO4:Tb3+ nanocrystals were negatively charged under weakly basic conditions (pH = 8.2), which can interact with Co2+ via electrostatic interaction. Moreover, there is the spectrum overlap between the emission wavelength of CePO4:Tb3+ NCs and the absorbance of Co2+. 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 Co2+ were 5-1.8 mu M and 3.5 nM, respectively. The method is successfully applied to the quantification of Co2+ in water samples. (C) 2013 Elsevier B.V. All rights reserved.