Trace detection of fluoride ion has gained increasing attention due to fluoride’s close association with biological and environmental processes. Herein, we construct a novel hybrid nanosystem consisting of carbon dots and curcumin for sensitive and selective sensing of F^–. Carbon dots are synthesized by hydrothermal treatment of 2,3-diaminopyridine and selenourea in hydrochloric acid. This material is employed as the fluorescent indicator that exhibits intense blue and yellow emission with quantum yields of 12% and 33%, respectively. Curcumin, possessing an absorption peak at 532 nm, can significantly quench the yellow fluorescence of carbon dots through inner filter effect. Curcumin is also used to specifically recognize F^–. When F^– is added, the curcumin-F^– complex generates, which leads to the hypochromatic shift of the absorption band from 532 to 430 nm. In such a case, the inner filter effect reduces, and yellow fluorescence of carbon dots recovers. Thus, a fluorescence turn-on sensor of F^– is built based on the carbon dots/curcumin system. The limits of detection and quantitation are measured to be 0.39 and 1.30 μM, respectively. For real usage, the proposed method is applied to determinate F^– in tap water and milk samples with relative standard deviations below 7.9%.

由于氟化物与生物和环境过程密切相关，因此痕量检测氟化物离子已引起越来越多的关注。本文中，我们构建了一个由碳点和姜黄素组成的新型杂化纳米系统，用于对F ^–进行敏感和选择性的感测。碳点是通过在盐酸中对2，3-二氨基吡啶和硒脲进行水热处理而合成的。该材料用作荧光指示剂，其显示出强烈的蓝色和黄色发射，量子产率分别为12％和33％。姜黄素在532 nm处具有吸收峰，可通过内部过滤作用显着淬灭碳点的黄色荧光。姜黄素也用于特异性识别F ^–。当添加F ^–时，姜黄素-F^–产生复合物，导致吸收带的色度从532 nm移至430 nm。在这种情况下，内部过滤效果降低，并且碳点的黄色荧光恢复。因此，基于碳点/姜黄素系统构建了F ^–的荧光开启传感器。检出限和定量限分别为0.39和1.30μM。为了实际使用，该建议方法用于测定自来水和牛奶样品中的F ^–相对标准偏差低于7.9％。