Research On Electrochemical Sensor Based On Modified Zinc Oxide Material

This paper used the precipitation method to prepare zinc oxide（ZnO）nanoflowers and then modified the screen-printed electrode（SPE）.Based on this,it is the first to propose the use of oxygen plasma technology to treat the ZnO electrode for simultaneous detection of DA and DS.At the same time,it is proposed for the first time to use high-temperature annealing to prepare ZnO MOF derivatives,and the modified electrode was used as the substrate for the electrochemical sensor to realize the simultaneous detection of DA and paracetamol（PAR）.The main contents of this paper are as follows::1.Firstly,the classification and application of electrochemical sensors are introduced;then describes the ZnO nanomaterials and research status;secondly,summarizes the oxygen plasma technology and its development prospects;then explains the development prospects of MOF derivatives and ZnO MOF derivatives;finally,it summarizes the research significance,research content and innovation of this paper.2.In this work,ZnO nanoflowers were prepared by precipitation method,and ZnO screen-printed electrodes（SPE）were processed by oxygen plasma technology.Scanning electron microscopy（SEM）,transmission electron microscopy（TEM）and X-ray diffraction（XRD）proved that the prepared material is pure ZnO and have nanoflower structure.The success of oxygen plasma treatment was verified by X-ray photoelectron spectroscopy（XPS）and Fourier transform infrared spectroscopy（FTIR）.3.Simultaneous detection of DA and DS by cyclic voltammetry（CV）using oxygen plasma modified ZnO electrode.The results showed that the linear ranges of DA and DS were 0.1-300 and 0.01-40μM,the detection limits were 0.28 and 0.11μM,and the sensitivities were 0.26 and 0.37μAμM^-1 cm^-2,respectively.They both showed good electrochemical performance.At the same time has good interference,stability and repeatability.4.In this paper,a high temperature annealing method was used to prepare ZnO MOF derivative modified electrodes for simultaneous detection of DA and PAR.First,the material was characterized by SEM,XRD,TEM and high-resolution Raman spectroscopy（Raman）,and the results verified the successful preparation of ZnO MOF derivatives.Secondly,the results of the CV test showed that the electrode modified by ZnO MOF derivative not only realized the simultaneous detection of DA and PAR,but also further improved the electrochemical performance.The linear ranges of DA and PAR were both 0.1-300μM,the detection limits of DA and PAR were 0.18 and 0.41μM,and the sensitivities were 0.402 and 0.28μAμM^-1 cm^-2,respectively.They also have good anti-interference and stability.In summary,this research not only provided a new ZnO surface modification method and ZnO preparation process,but also provided a new idea for making it possible to be a new detection technology for drug detection and human health monitoring.