Efficient Detection of Trace Hg2+ in Water Based on the Fluorescence Quenching of Environment-friendly Thiol-functionalized Poly(vinyl alcohol) Capped CdS Quantum Dots Nanocomposite
Efficient Detection of Trace Hg2+ in Water Based on the Fluorescence Quenching of Environment-friendly Thiol-functionalized Poly(vinyl alcohol) Capped CdS Quantum Dots Nanocomposite
复制标题
基于环保型硫醇官能化聚乙烯醇封端CdS量子点纳米复合材料荧光猝灭高效检测水中痕量Hg2
DOI：
10.2116/analsci.32.161
复制
发表时间：
2016-02-01
影响因子：
1.6
通讯作者：
Lei, Zigiang
中科院分区：
文献类型：
--
作者：
Guan, Xiaolin;Fan, Hongting;Lei, Zigiang
利用环境友好的材料来传感有毒金属离子在最近的研究中引起了极大的关注。本文报道了以硫醇功能化的聚乙烯醇(PVA)为唯一封端配体，水相合成稳定的硫化镉量子点，用于环境水样中痕量Hg2+的检测。平均尺寸为3.3 nm的CdS量子点具有良好的水溶性和良好的荧光性能，量子产率为32.8%，发光寿命为31.9 ns。加入Hg2+后，量子点水溶液在520 nm波长处的荧光强度被猝灭。在最佳条件下，空白荧光强度与猝灭荧光强度之比与Hg2+浓度在2~4000 nm范围内呈线性关系，检出限为1 nM。多种共存金属离子对Hg2+的检测无干扰。该纳米材料已成功应用于水样中汞离子的测定。
Using environment-friendly materials for sensing toxic metal ions has drawn significant attention in recent research. Herein, we present an aqueous synthesis of stable CdS quantum dots (QDs) using thiol-functionalized poly(vinyl alcohol) (PVA) as the unique capping ligand for the detection of trace Hg2+ in environmental water samples. The CdS QDs with an average size of 3.3 nm had good water-solubility and favorable fluorescence with a quantum yield of 32.8% and a longer luminescence lifetime of 31.9 ns. The fluorescence intensity of QDs aqueous solution in the 520 nm wavelength was quenched upon the addition of Hg2+. Under the optimal conditions, the ratio of the blank fluorescence intensity to the quenched fluorescence intensity was linearly proportional to the Hg2+ concentration from 2 to 4000 nM with a detection limit of 1 nM. Also, many co-existing metal ions were not interfered with the detection of Hg2+. This nanomaterial was successfully applied to the measurement of Hg2+ in water samples.