Herein, we report a green synthetic approach for the synthesis of water-soluble fluorescent CQDs via a simple one-step hydrothermal treatment using Tamarindus indica leaves for the first time. The prepared CQDs show an excitation-dependent behavior in the range from 260 to 400 nm with a high QY of approximately 46.6%. Further, the prepared CQDs serve as a very sensitive nanoprobe for the turn-off sensing of Hg²⁺ with a minimum LOD as low as 6 nM in the dynamic range from 0 to 0.1 μM. The attractiveness of the present sensing system is that it further acts as a turn-on sensor for GSH detection with good selectivity. The feasibility of the present sensing system is also examined using pond water samples for the detection of Hg²⁺. Thus, the present sensing system is reliable for sensing and several another analytical applications.

中文翻译：

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荧光碳量子点的绿色合成，用于检测汞（ii）和谷胱甘肽†

在这里，我们首次报道了一种绿色合成方法，该方法首次通过简单的一步式水热处理使用罗望子（Tamarindus indica）叶来合成水溶性荧光CQD 。制备的CQD在260至400 nm范围内表现出与激发有关的行为，其高QY约为46.6％。此外，制备的CQD用作非常灵敏的纳米探针，用于在0至0.1μM的动态范围内关断检测Hg ²⁺，最小LOD低至6 nM。本传感系统的吸引力在于，它还具有良好的选择性，进一步用作GSH检测的开启传感器。还使用池塘水样本检测Hg ^2+来检查本传感系统的可行性。。因此，本感测系统对于感测和其他几种分析应用是可靠的。