Fabrication Of Molybdenum Disulfide Quantum Dots And Detection Of Dopamine

Molybdenum disulfide quantum dots(MoS2 QDs),as a typical representative of transition metal sulfides,had attracted much attention due to their unique optical properties and huge potential applications.In this paper,molybdenum disulfide quantum dots with high purity and quality were prepared by mechanical stripping-solvothermal treatment,and the detection of dopamine with high sensitivity and strong anti-interference was realized.The specific research contents are as follows:(1)MoS2 QDs with high purity and small size were synthesized from top to bottom by mechanical stripping-solvothermal treatment using MoS2 crystal as raw material and N-methyl-2-pyrrolidone(NMP)as solvent.(2)It was found that the ass-prepared molybdenum disulfide quantum dots have obvious excitation wavelength dependence.The fluorescence quantum efficiency of molybdenum disulfide quantum dots was calculated to be 57.55%with the standard quinine sulfate solution as reference.(3)MoS2 QDs were used as fluorescent probes to detect dopamine.When dopamine was added into the solution of quantum dots,the fluorescence quenching of molybdenum disulfide quantum dots exhibited.When dopamine is added to 1000 ?M,the fluorescence quenching efficiency is 58.2%.By analyzing and calculating the quantum dot solution with different concentration of dopamine,the detection limit of the system was 0.32 ?M.(4)To explore the stability and selectivity of molybdenum disulfide quantum dots for dopamine detection.After changing the acidity and alkalinity of the solution or adding other particles into the solution,it was found that the detection effect of the system did not change with the change of solution pH,nor was it affected by other small molecules and ions.It was proved that the detection system had high stability and selectivity for dopamine detection.Figures 28,tables 5,references 67.