Abstract This work attempts to address the challenge of trace level detection of uranyl ions using highly fluorescent perovskite quantum dots. The fluorescent probe CsPbBr3 perovskite quantum dots (PQDs) in toluene, synthesized via hot-injection method allows complete fluorescence quenching within seconds detecting ppb level concentration of uranyl ions. The mechanistic pathway is deeply investigated and proposed through zeta potential/DLS measurement, the extent of spectral overlap by the change in length of ligands of PQDs, alignment of acceptor-donor energy levels, the unlikeliness of cation exchange and TRPL studies. This study opens new insights into designing the correct combination of the probe (involving PQDs) and analyte (involving metal ions) for trace level sensing of metal ions.

中文翻译：

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铀离子的超痕量化学传感；从钙钛矿量子点到吸附的铀酰离子的电子和能量转移之间的混战

摘要 这项工作试图解决使用高荧光钙钛矿量子点对铀酰离子进行痕量检测的挑战。通过热注射法合成的甲苯中的荧光探针 CsPbBr3 钙钛矿量子点 (PQD) 允许在几秒钟内完成荧光猝灭，检测铀酰离子的 ppb 级浓度。通过 zeta 电位/DLS 测量、PQD 配体长度变化引起的光谱重叠程度、受体-供体能级对齐、阳离子交换和 TRPL 研究的可能性，对该机制途径进行了深入研究和提出。这项研究为设计探针（涉及 PQD）和分析物（涉及金属离子）的正确组合用于金属离子的痕量级传感开辟了新的见解。