Preparation And Application Of Nano CuO And Electrochemically Activated Modified Electrode

Since the birth of chemically modified electrode,it has been an active research direction in the field of electrochemistry.Because of its relatively easy preparation and good selectivity,it has been widely used in many fields such as environment,energy,life,electronics and materials science.In recent years,nano materials,through their own synergistic effect,accelerate the transfer rate of electrons on the electrode surface.After they are modified on the electrode surface to make modified electrode,they can express the expected reaction with high selectivity.Therefore,nano materials also play a very important role in the field of electroanalytical chemistry.Based on this,the performance of the modified electrode under different conditions was studied in this paper,and the determination of L-Cys and dienestrol was realized,the specific work and experimental conclusions are as follows:In the introduction part,the definition,development process,preparation methods and characteristics of chemically modified electrodes are summarized;the concept,characteristics,classification methods and application of nanomaterials are introduced;the detection methods and practical applications of chemically modified electrodes in L-Cys and dienestrol are listed;the background of this paper and the main contents of the study are explained.In the second part,a new electrochemical method for the determination of L-Cys was developed.Firstly,nanocuo/GCE was prepared by electrochemical deposition.Then,the electrochemical behavior of L-Cys modified electrode was analyzed by cyclic voltammetry.The experimental results show that the modified electrode has better electrocatalytic activity for the detection of L-Cys compared with the bare glassy carbon electrode.Through a series of optimization of experimental conditions,we conclude that L-Cys and its oxidation peak current are in the range of 1.00×10-9～1.20×10-7 mol/L and 1.20×10-7～1.20×10-5mol/L,showing a good linear relationship,and the detection lower limit is up to 1.13×10-10 mol/L,RSD is 4.72%,which has a good effect in the detection of actual samples.The third part is the electrochemical behavior and determination of dienestrol on the graphite electrode.In this chapter,we first reported the determination of dienestrol on the activated graphite electrode by cyclic voltammetry.The optimum conditions for the determination of dienestrol on the graphite electrode were determined by examining the properties of the electrode,whether it was activated or not,different scanning speed,bottom solution,p H value and enrichment time.The results show that the catalytic effect of graphite electrode on the oxidation of dienestrol is more obvious after activation.Under the optimized conditions,the linear range of determination of dienestrol is between 6.00×10-7～1.00×10-5 mol/L,and the detection limit can reach 2.90×10-8 mol/L.This method is fast,sensitive,reproducible and stable.