Functionalized carbon nitride quantum dots (CNQDs) are fabricated by moderate carbonization of L-tartaric acid and urea in oil acid media by a facile microwave-assisted solvothermal method. The obtained CNQDs are monodispersed with a narrow size distribution (average size of 3.5 nm), and exhibit excellent selectivity and sensitivity of fluorescence quenching for 2,4,6-trinitrophenol (TNP) with a quenching efficiency coefficient K_sv of 4.75 × 10⁴ M⁻¹. This sensing system exhibits a fast response time within 1 min and a wide linear response range from 0.1 to 15 μM. The limit of detection is as low as 87 nM, which is comparable or lower than the other probes. The application of the developed probe to the detection of TNP in spiked water samples yields satisfactory results. The mechanism of fluorescence quenching is also discussed.

功能化氮化碳量子点 (CNQDs) 是通过简便的微波辅助溶剂热法在油酸介质中对L-酒石酸和尿素进行适度碳化制备的。所得CNQDs单分散，粒径分布窄（平均粒径3.5 nm），对2,4,6-三硝基苯酚（TNP）具有优异的荧光猝灭选择性和灵敏度，猝灭效率系数K _sv为4.75 × 10 ⁴ 米^-1. 该传感系统具有 1 分钟内的快速响应时间和 0.1 至 15 μM 的宽线性响应范围。检测限低至 87 nM，与其他探针相当或更低。将开发的探针应用于加标水样中 TNP 的检测产生了令人满意的结果。还讨论了荧光猝灭的机制。