Synthesis Of Metal Nanoparticles-Molybdenum Disulfide-Graphene Nanocomposites And Electrochemical Detection Of Hydrazine And BIONL

Chapter1:Firstly,we introduced the development,structure and properties of graphene and molybdenum disulfide?MoS₂?.Then,we summarized the preparation and functionalization methods,and their applications.Ultimately,the research background,main contents and innovative points of these works have expressed.Chapter 2:Gold nanoparticles integrated with molybdenum disulfide functionalized graphene?AuNPs-MoS₂-rGO?were successfully synthesized with thermal reduction,using graphene oxide?GO?as the matrix,sodium molybdenum as molybdenum source and L-cysteine as sulfur source.The nanocomposites were characterized by ultraviolet-visible absorption spectra,transmission electronamicroscope and X-ray photoelectronaspectroscopy.The results showed that nanocomposites on the modified electrode possessed obvious reducing capacity for the oxidation of hydrazine,indicating that AuNPs,MoS₂ and graphene had synergistic effects on the catalytic oxidation for hydrazine.Chronoamperometry was used for sensitive detection of hydrazine.The linear relationship between the value of peak current and the hydrazine concentration is observed from 0.05?mol/L to 2000?mol/L,and the limit of detection is as low as 0.0167?mol/L on the basis of the signal-to-noise characteristics?S/N=3?with the recovery between 98.0-105.0%.Compared with the conventional sensors,the proposed AuNPs-MoS₂-rGO electrochemical sensor exhibited better stability and reproducibility,which are significant for the detection of hydrazine in water sample with satisfactory results.Chapter 3:In this work,platinum nanoparticles?PtNPs?on PDDA-molybdenum disulfide?MoS₂?functionalized graphene were composited via the hydrothermal process and reduced by N₂H₄.MoS₂functionalized graphene?MoS₂-rGO?were synthesized through hydrothermal method.PtNPs were then introduced into MoS₂-rGO by adding H₂PtCl₆ and N₂H₄ at 60?,noted as PtNPs-MoS₂-rGO.Then,PtNPs-MoS₂-rGO nanocomposites were characterized by UV-vis,CV,TEM and so on.The PtNPs-MoS₂-rGO nanocomposites combine the large surface area of MoS₂-rGO with the better catalytic activity of PtNPs.An electrochemical sensor was constructed for binaphthol?BIONL?determination based on PtNPs-MoS₂-rGO.Under the optimal experimental conditions,differential pulse voltammetry?DPV?was applied for quantitative determination of BIONL.The detection of BIONL is 0.07?mol/L?S/N=3?.It has very well stability and good sensitivity of this established electrochemical sensor,which settles the foundation for measuring BIONL and binaphthol derivatives in pesticide and pharmaceutical application industries.Chapter 4:All the works in this paper are summarized.There are some disadvantages in the present work,and putting forward some possible schemes.In the end,it is discussed that the application prospects of electrochemical sensors in environment,agriculture and medicine.