基于金属诱导的 ZnSe/ZnS 量子点聚集的 Hg(II) 高灵敏探针的简便制备

A facile and highly sensitive probe for Hg(II) based on metal-induced aggregation of ZnSe/ZnS quantum dots.

机构信息

State Key Laboratory of Fine Chemical, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China.

出版信息

Nanoscale. 2012 Aug 21;4(16):4996-5001. doi: 10.1039/c2nr31238g. Epub 2012 Jul 4.

DOI:10.1039/c2nr31238g

PMID:22763507

Abstract

Sensitive and selective detection strategies for toxic heavy metal ions, which are rapid, cheap and applicable to environmental and biological fields, are of significant importance. As a result of specific interaction between thiol(s) used as ligands and heavy metal ions, the photoluminescence intensity of quantum dots (QDs) in PBS buffer solution was quenched and the aggregation of QDs was formed at the same time. Herein, we present water-soluble, low toxic QDs, ZnSe/ZnS, which were applied for ultrasensitive Hg(2+) ion detection with a low detection limit (2.5 nM). In addition, a model has been proposed to explain the aggregation of QDs in the presence of heavy metal ions such as Hg(2+) ions.

摘要

对于毒重金属离子的灵敏和选择性检测策略，具有快速、廉价和适用于环境和生物领域的特点，具有重要意义。由于硫醇（作为配体）与重金属离子之间的特异性相互作用，在 PBS 缓冲溶液中的量子点（QDs）的光致发光强度被猝灭，同时 QDs 发生聚集。在此，我们提出了一种水溶性、低毒性的 QDs，ZnSe/ZnS，它可以用于超灵敏的 Hg(2+)离子检测，检测限低至 2.5 nM。此外，还提出了一个模型来解释在存在重金属离子（如 Hg(2+)离子）时 QDs 的聚集。