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提出了一种基于硅量子点电子转移荧光淬灭检测2,4,6-三硝基甲苯/2,4,6-三硝基苯酚的新方法.在这个工作中,我们制备了一种表面氨基包覆的强荧光、抗光漂白、单分散的硅量子点.TNT/TNP与硅量子点表面的氨基通过化学识别形成稳定的Meisenheimer复合物,从而淬灭硅量子点的荧光并诱导其团聚.硅量子点的荧光强度与TNT/TNP浓度的对数呈线性负相关,TNT和TNP的检测下限分别为50和5 pg/mL.实验证明,该分析方法有较好的选择性并对分析介质的pH值不敏感,有望实现环境中TNT/TNP的实时、现场和超痕量检测.
A new method for the determination of 2,4,6-trinitrotoluene / 2,4,6-trinitrophenol based on fluorescence quenching of silicon quantum dots electron transfer was proposed. In this work, we prepared a surface Amino-coated, strongly fluorescent, photobleached, monodisperse silicon quantum dots.TNT / TNP forms a stable Meisenheimer complex with the amino groups on the surface of the silicon quantum dots by chemical recognition, quenching the fluorescence of the silicon quantum dots and inducing their agglomeration .The fluorescence intensity of silicon quantum dots was linearly negatively correlated with the logarithm of TNT / TNP concentration.The detection limits of TNT and TNP were 50 and 5 pg / mL, respectively.Experiments show that this method has good selectivity and is suitable for analysis The pH of the media is insensitive and is expected to enable real-time, on-site and ultra-trace detection of TNT / TNP in the environment.