Abstract Perovskite quantum dots (QDs) have the sensing applications only in organic solution because of their instability in water. In this communication, we report an ingenious way to detect Cu2+ in aqueous solution based on the CsPbBr3 (CPB) QDs. The idea is that adding strong organic ligand (oleylamine, OAm) to selectively transfer Cu2+ ions from water to cyclohexane to quench fluorescence of CPB QDs. Due to the strong interaction between the amine ligands and the metal ions, OAm in cyclohexane can capture Cu2+ from water to form OAm-Cu2+ complexes at the interface of cyclohexane/water. These Cu2+ complexes can rapidly diffuse into cyclohexane and finally quench PL of the CPB QDs. The linear range, high selectivity, response time and quenching mechanism of the probe were studied.

中文翻译：

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钙钛矿量子点作为荧光探针通过相转移检测水溶液中的金属离子

摘要 钙钛矿量子点（QDs）由于其在水中的不稳定性，仅在有机溶液中具有传感应用。在本次交流中，我们报告了一种基于 CsPbBr3 (CPB) QD 检测水溶液中 Cu2+ 的巧妙方法。这个想法是添加强有机配体（油胺，OAm）以选择性地将 Cu2+ 离子从水中转移到环己烷中，以淬灭 CPB QD 的荧光。由于胺配体与金属离子之间的强相互作用，环己烷中的 OAm 可以从水中捕获 Cu2+，在环己烷/水的界面形成 OAm-Cu2+ 络合物。这些 Cu2+ 配合物可以迅速扩散到环己烷中并最终淬灭 CPB QD 的 PL。研究了探针的线性范围、高选择性、响应时间和猝灭机制。