| Molybdenum disulfide(Mo S2)is a family of transition metal sulfides and it is the most typical of research materials,because its obvious characteristics in optical,electrochemical and physical,which can be applied to the sensor,the electric catalytic,super capacitor and other fields,It is also considered by people from all walks of life as one of the most potential new age material.Due to their different shapes and sizes,nanomaterials exhibit many excellent properties,typically including high catalytic activity,large specific surface area,strong adsorption and high surface activity.As for nanomaterials,metal nanoparticles have a wider application range and can attract the focus of the research community.The metal nanoparticles have the characteristics of high free energy and large specific surface area.When the modified electrode is on the surface of the electrode,the sensitivity of the electrode can be significantly improved.By introducing metal nanoparticles into the modified electrode,some substances can be catalyzed and can also be used for rapid detection.Two-dimensional(2D)nanomaterial zinc oxide(Zn O),due to its excellent physical and chemical properties generated by its two-dimensional structure,has a high application value in the manufacture of high-performance electrochemical sensors.Carbon materials such as graphene,carbon nanotubes and carbon black have been widely used in the field of electrochemical detection of inorganic ions and biomolecules.Among the above materials,carbon nanotubes and carbon black have more obvious advantages,such as good electrical conductivity,low application cost,strong adsorption performance and large specific surface area,etc.,so they are widely used in the electrochemical detection of various substances and are favored by researchers.Using synthetic polyacrylate sodium good flower structure of Mo S2 dispersion,and zinc oxide by modified noble metal nanoparticles,carbon materials to accelerate the electron transfer,promote the synergy can be further enlarged the application range,can greatly improve the electrochemical signals,thus improve the sensitivity and lower detection limit,therefore,this thesis mainly dedicated to the study on the basis of Mo S2 nanocomposites of the construction of the sensor and its application in electrochemical analysis.The main content is divided into the following three parts:1.Preparation of Mo S2/Au NPS modified electrode and its determination of nitriteIn this work,Mo S2/Au NPs nanomaterials were successfully prepared and modified on the electrode surface,which can be used for electrochemical detection of nitrite.The electrochemical behavior of the electrodes was investigated by cyclic voltammetry(CV)and electrochemical impedance spectroscopy(EIS).The experimental results show that the REDOX peak current of nitrite can be increased by the modified electrode Mo S2/Au NPs/GCE.The results showed that the peak current was linearly related to the concentration in the concentration range of 3.92×10-6?9.26×10-3 mol·L-1,and the detection limit was 3×10-8 mol·L-1(S/N=3).The experiment shows that Mo S2/Au NPS composite has a good response to nitrite,and a good determination result has been obtained.It can be used in the detection of nitrite in actual water samples.2.Preparation of Mo S2/Zn O/CB NPs modified electrode and determination of anticorbic acidIn this work,Mo S2/Zn O/CB NPs/GCE modified electrode can significantly enhance the oxidation peak current corresponding to ascorbic acid(AA).The electrochemical behavior of the modified electrode was analyzed by differential pulse voltammetry(DPV)and other methods.It was found that the modified electrode showed an ideal electrochemical response against scorbic acid.Under the optimal detection conditions,the linear range of ascorbic acid was 5×10-6?1×10-3mol·L-1,and the detection limit was 1×10-7 mol·L-1(S/N=3).In addition,glucose,uric acid,hydrogen peroxide and other substances have no obvious interference in the detection of ascorbic acid,which can be used for the detection of ascorbic acid in serum,and the detection results are relatively satisfactory.3.Preparation of Mo S2-Ru S2/MWCNT modified electrode and its determination of dopamineIn this work,MWCNT and Mo S2-Ru S2 nanocomposite layer modified electrode was successfully used for electrochemical detection of dopamine.The performance of the electrode was investigated by CV,DPV and other electrochemical methods.The results showed that the linear range of the Mo S2-Ru S2/MWCNT/GCE electrode for the detection of dopamine was 5×10-6?5×10-4mol·L-1,and the detection limit was6×10-7mol·L-1(S/N=3).This method is rapid,simple and efficient,and has achieved good results in detecting dopamine in urine samples. |
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