Abstract

In this work, we have developed a near-infrared emissive polyethyleneimine capped Ag₂(PEI-Ag₂S QD) quantum dots based chemosensor for sensing trace-level Hg²⁺ in water by taking advantage of the metal-induced aggregation strategy. The fluorescence determination of Hg²⁺ by PEI-Ag₂S QD at different pH (pH 4, 7, and 10) were performed, respectively. Under the optimum conditions, the selectivity of this system for Hg²⁺ over other metal ions in aqueous solutions was remarkably high, and its detection limits was 0.5 nM at pH 4. In addition, the present approach provides the advantages of rapidity, simplicity, low background and low cost. The assay also offers great potential for specific detection of Hg²⁺ in real water samples. This developed PEI-Ag₂S QD-based method presages more opportunities for application in environmental systems.

中文翻译：

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聚乙烯亚胺保护的Ag 2 S量子点用于近红外荧光增强检测水中的痕量Hg 2+

摘要

在这项工作中，我们已经开发了一种基于近红外发射聚乙烯亚胺的Ag ₂（PEI-Ag ₂ S QD）量子点化学传感器，该传感器利用金属诱导的聚集策略来感测水中的痕量Hg ²⁺。通过PEI-Ag ₂ S QD在不同pH（pH 4、7和10）下分别进行Hg ²⁺的荧光测定。在最佳条件下，该系统对Hg ²⁺的选择性水溶液中其他金属离子的检测限非常高，其检测极限在pH 4时为0.5 nM。此外，本方法具有快速，简便，背景低且成本低的优点。该检测方法还具有很大的潜力，可用于特异性检测实际水样中的Hg ²⁺。这种基于PEI-Ag ₂ S QD的开发方法预示了在环境系统中应用的更多机会。