Ultrasensitive mercury(II) ion detection by europium(III)-doped cadmium sulfide composite nanoparticles.
Ultrasensitive mercury(II) ion detection by europium(III)-doped cadmium sulfide composite nanoparticles.
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DOI：
10.1016/j.talanta.2010.08.052
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发表时间：
2010-11
期刊：
影响因子：
6.1
通讯作者：
Hongqi Chen;Jie Fu;Lun Wang;Bo Ling;Bin-bin Qian;Jing-guo Chen;Cailing Zhou
中科院分区：
文献类型：
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作者：
Hongqi Chen;Jie Fu;Lun Wang;Bo Ling;Bin-bin Qian;Jing-guo Chen;Cailing Zhou
以生物分子谷胱甘肽(GSH)为封端配体，通过一锅法制备了Eu3+掺杂的硫化镉复合纳米颗粒。以纳米硫化镉为能量供体，Eu3+离子为能量受体，建立了一种高效的荧光能量传递体系。由于特定的相互作用，在Hg2+的存在下，Eu3+掺杂的CDS纳米颗粒的荧光强度明显降低。此外，Eu络合物的长荧光寿命和大的斯托克位移使其能够进行灵敏的荧光检测。在最佳条件下，Eu3+在614 nm处的荧光强度与Hg2+浓度在10nmolL−1~1500nmolL−1范围内呈线性关系，对Hg2+的检出限为0.25nmolL−1。除了具有较高的稳定性和重现性外，复合纳米颗粒对常见共存阳离子具有独特的选择性。并将该方法应用于水溶液中痕量汞的测定。探讨了Eu3+掺杂的硫化镉复合纳米颗粒与Hg2+反应的可能机理。
With the biomolecule glutathione (GSH) as a capping ligand, Eu3+-doped cadmium sulfide composite nanoparticles were successfully synthesized through a straightforward one-pot process. An efficient fluorescence energy transfer system with CdS nanoparticles as energy donor and Eu3+ions as energy accepter was developed. As a result of specific interaction, the fluorescence intensity of Eu3+-doped CdS nanoparticles is obviously reduced in the presence of Hg2+. Moreover, the long fluorescent lifetime and large Stoke's shift of europium complex permit sensitive fluorescence detection. Under the optimal conditions, the fluorescence intensity of Eu3+at 614nm decreased linearly with the concentration of Hg2+ranging from 10nmolL−1to 1500nmolL−1, the limit of detection for Hg2+was 0.25nmolL−1. In addition to high stability and reproducibility, the composite nanoparticles show a unique selectivity towards Hg2+ion with respect to common coexisting cations. Moreover, the developed method was applied to the detection of trace Hg2+in aqueous solutions. The probable mechanism of reaction between Eu3+-doped CdS composite nanoparticles and Hg2+was also discussed.