AbstractA series of dual-emission fluorescent probes was prepared from copper nanoclusters (Cu NCs) and carbon dots (CDs). They show two emission peaks (blue at 469 nm and red at 622 nm) when photoexcited at 365 nm. Upon exposure to sulfide, the Cu NCs will be deteriorated because they react with sulfide to form CuS. This results in the quenching of the red fluorescence of the Cu NCs, while the blue fluorescence of the CDs remains constant. Thus, the color of the nanocomposite changes from red to blue. The ratio of the fluorescences at the two wavelengths decreases linearly in the 2–10 ppb (26–128 nM) sulfide concentration range, and the limit of detection is 0.33 ppb (4.3 nM). The nanocomposite also was placed in an agar gel and then incorporated into a paper strip for fluorometric monitoring of gaseous hydrogen sulfide. Graphical abstractSchematic presentation of the synthesis of Cu NCs (copper nanoclusters)-CDs (carbon dots) dual-emission nano-assembly, Cu NCs-CDs-agar fluorescent film and their application for the detection of sulfide and H2S.

中文翻译：

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由铜纳米团簇和碳点制备的双发射纳米复合材料作为硫化物和气态 H2S 的比率荧光探针

摘要 以铜纳米团簇（Cu NCs）和碳点（CDs）为原料制备了一系列双发射荧光探针。当在 365 nm 光激发时，它们显示出两个发射峰（469 nm 处的蓝色和 622 nm 处的红色）。暴露于硫化物后，Cu NCs 会劣化，因为它们与硫化物反应形成 CuS。这导致 Cu NCs 的红色荧光猝灭，而 CDs 的蓝色荧光保持不变。因此，纳米复合材料的颜色从红色变为蓝色。在 2–10 ppb (26–128 nM) 硫化物浓度范围内，两个波长的荧光比率呈线性下降，检测限为 0.33 ppb (4.3 nM)。纳米复合材料也被放置在琼脂凝胶中，然后加入纸带中，用于气态硫化氢的荧光监测。