Synthesis Of MoS₂ Based Nanocomposites Application And Application Of Dopamine Electrochemical Sensing

Molybdenum disulfide（MoS₂） as a typical representative of transition metal sulfides,thre-dimensional structure are similar to graphene,a stable 2d layer structure,this structure makes it have high chemical stability and larger specific surface area,at the same time,the research showed that how phase affected by the conductivity of different phase of MoS₂and catalytic activity,1T-MoS₂have good conductivity but no catalytic activity,2 R-MoS₂catalytic performance is poorer,but the electrical conductivity is superior,at present there are two main strategies of changing the phase adjustment of MoS₂two phase proportion,In order to optimize the comprehensive performance of the material,metal,nonmetal,biomolecule and metal oxide combined with MoS₂to make up for the lack of electrical conductivity and catalytic activity,the application of suitable materials in catalysis,sensing,optics and electrochemical detection,has a broad development prospect and huge space for development.Unprocessed MoS₂ poor electrical conductivity,limiting the MoS₂in electrochemistry in the field of research and development,so we try to through the use of MoS₂nanotube and the interaction betwen metal oxide,is through electrochemical analysis test Ferro Ferric oxide nanomaterials-MoS₂（Fe₃O₄@MoS₂）,to observe the morphology and elemental composition,then on the basis of constructing the gold/iron oxide-MoS₂nanoparticles（Fe₃O₄@MoS₂-Au）and nano silver-iron oxide-MoS₂（Ag@Fe₃O₄@MoS₂）.Molybdenum disulfide（MoS₂） two electrochemical sensors,and successfully applied to the detection of dopamine,obtained stability and high reputation,successfully realized the detection of dopamine in body fluids.The research content is mainly divided into the following parts:Chapter 1:The structure and properties of MoS₂are briefly introduced,and the synthesis methods of MoS₂nanomaterials as well as the corresponding advantages and disadvantages are listed.Finally,the latest research progress of MoS₂nanomaterials is summarized.Chapter 2:Using MoS₂ as the precursor,high pressure steam and water in closed stainless stel were used as solvents by hydrothermal method and solvent method.MoS₂and Fe₃O₄nano-particles were used as raw materials with mass ratios of 1:2 and 1:4,respectively.The solutions were centrifuged first,and then vacuum dried to obtain Fe₃O₄@MoS₂nano-composites.Chapter 3:Fe₃O₄@MoS₂ was dissolved in secondary water and dispersed uniformly by ultrasound.A new electrochemical sensor was constructed by electroplating gold nanoparticles on the surface of the electrode.The shape and characteristics of Fe₃O₄@MoS₂were observed,the electrochemical characteristics of Fe₃O₄@MoS₂-Au/GCE were explored,and the electrochemical behavior of dopamine on the electrochemical sensor was systematically studied.The results show that the effective linear range of the sensor is 15～750μmol/L,the detection limit is 8μmol/L（S/N=3）,and the spiked recovery rate is 96～107%.Cyclic voltammetry（CV）and differential pulse voltammetry（DPV）have ben used for the sensitivity analysis of dopamine in human serum,and have potential application prospects in clinical detection of dopamine.Chapter 4:Fe₃O₄@MoS₂-Au/GCE best performance when the p H value of 7.4,so is suitable for the detection of dopamine in the blood,in the face of the urine p H range in 5-7 environment,detection ability is very weak,so we in the Fe₃O₄@MoS₂nanocomposites with silver nitrate ion,synthesis of Fe₃O₄@MoS₂-Au after electrochemical characterization of nano composite materials,found that the sensitivity of dopamine,electrical signal,and the best p H value of 6.0,the experimental results show that the effective linear range of the sensor for 15～750 u mol/L,The detection limit was 8μmol/L（S/N=3）,and the recoveries were 92-105%.Cyclic voltammetry（CV）and differential pulse voltammetry（DPV）have ben used for the sensitivity analysis of dopamine in human serum,and have potential application prospects in clinical detection of dopamine.Therefore,a stable,reversible and rapid method for the detection of mercury ions was established.The sensor can be used to detects dopamine in urine.