AbstractA fluorescent probe is presented for sensitive determination of Hg(II). It is based on aggregation induced enhancement effect (AIEE) of carbon dots co-doped with nitrogen and sulfur (N,S-CDs). The N,S-CDs were prepared by a one-pot microwave-assisted method using glycerol as the reaction solvent, and cystine as the source for C, N and S. The resulting CDs are well soluble in water and have a turn-on fluorescence response to Hg(II). The incubation time and ratio of raw materials were optimized. Fluorescence, best measured at excitation/emission wavelengths of 325/385 nm, increases linearly in the 1–75 μM Hg(II) concentration range, and the detection limit is 0.5 μM. The method performed successfully when detecting Hg(II) in spiked tap and lake waters, with recoveries between 92 and 106%. Graphical abstractSchematic presentation of the aggregation induced enhancement of the fluorescence of carbon dots co-doped with nitrogen and sulfur after addition of Hg(II).

中文翻译：

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微波辅助合成碳点，通过聚集诱导发射“开启”荧光测定 Hg(II)

摘要提出了一种用于灵敏测定 Hg(II) 的荧光探针。它基于与氮和硫 (N,S-CDs) 共掺杂的碳点的聚集诱导增强效应 (AIEE)。N,S-CDs 是通过一锅微波辅助方法制备的，使用甘油作为反应溶剂，胱氨酸作为 C、N 和 S 的来源。得到的 CDs 易溶于水并具有开启性对 Hg(II) 的荧光响应。优化孵育时间和原料配比。荧光最好在 325/385 nm 的激发/发射波长下测量，在 1–75 μM Hg(II) 浓度范围内线性增加，检测限为 0.5 μM。该方法在检测加标自来水和湖水中的 Hg(II) 时成功执行，回收率在 92% 到 106% 之间。