Abstract In recent years, copper nanoclusters (Cu NCs) have attracted a great deal of research interests, because the fluorescence intensity will be significantly enhanced after they aggregate, which makes them an ideal material for constructing chemical sensors. The current Cu NCs based sensor researches focus mainly on the control of surface modification and aggregation conditions. Herein, we report a method for direct detection of Cu2+ ions through in situ cluster formation and aggregation. Glutathione was used as both reducing agent and stabilizing agent, while tetrahydrofuran as the poor solvent. When the analyte of Cu2+ ions were added to the mixed solution, they were reduced and aggregated to generate bright orange emission. The method is easy to operate and the reaction complete within 2 min. The detection limit for Cu2+ ions is as low as 0.17 μM. Based on these findings, we successfully achieved the determination of copper content in naturally occurring mineral. Therefore, the method reported here provides a convenient and sensitive way to perform qualitative analysis of Cu2+ ions.

中文翻译：

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通过形成和聚集 Cu 纳米团簇来检测 Cu2+ 离子的简易阶段

摘要 近年来，铜纳米团簇（Cu NCs）由于聚集后荧光强度显着增强，成为构建化学传感器的理想材料，引起了广泛的研究兴趣。当前基于Cu NCs的传感器研究主要集中在表面改性和聚集条件的控制上。在此，我们报告了一种通过原位簇形成和聚集直接检测 Cu2+ 离子的方法。谷胱甘肽既用作还原剂又用作稳定剂，而四氢呋喃用作不良溶剂。当 Cu2+ 离子的分析物加入到混合溶液中时，它们被还原和聚集，产生亮橙色的发射光。该方法操作简单，反应在2分钟内完成。Cu2+ 离子的检测限低至 0.17 μM。基于这些发现，我们成功地实现了对天然矿物中铜含量的测定。因此，本文报道的方法为 Cu2+ 离子的定性分析提供了一种方便且灵敏的方法。