Cu^2+修饰的氮掺杂石墨烯量子点荧光传感器检测2-巯基苯并噻唑的研究

Study on Determination of 2-Mercaptobenzothiazole Using a Fluorescence Sensor with Cu2+ Modified Nitrogen-doped Graphene Quantum Dots

采用一步水热合成法制备了氮掺杂石墨烯量子点(N-GQDs),量子点表面的特定官能团与Cu2+进一步结合后,形成N-GQDs-Cu2+络合物,有效地猝灭了荧光。加入2-巯基苯并噻唑(MBT)时,由于MBT与Cu2+具有强作用力,使得Cu2+从量子点表面解离下来,量子点荧光恢复。据此构建了一种基于Cu2+修饰的氮掺杂石墨烯量子点的高灵敏荧光传感器用于MBT的检测。在最佳实验条件下,MBT在0.4~40.0μmol/L浓度范围内与荧光恢复强度呈良好线性,检出限为0.1μmol/L。该方法用于实际水样中MBT的检测,加标回收率为95.0%~101%。

In this paper,nitrogen-doped graphene quantum dots(N-GQDs) were prepared by one-step hydrothermal synthesis.Cu2+ ions were combined with the specific functional groups on surfaces of the quantum dots to form N-GQDs-Cu2+ complexes,which could quench fluorescence effectively.Furthermore,when 2-mercaptobenzothiazole(MBT) was added,Cu2+ were dissociated from the surface of the quantum dots due to the strong force of MBT and Cu2+,and the fluorescence from the quantum dots was recovered.Thus,a highly sensitive fluorescence sensor based on Cu2+ modified N-GQDs was constructed for the detection of MBT.Under the optimal experimental conditions,there was a good linear relationship between MBT and fluorescence recovery intensity in the concentration range of 0.4-40.0 μmol/L,and the limit of detection was 0.1 μmol/L.The method could be applied in the detection of MBT in real water samples with spiked recoveries of 95.0%-101%.