The Research Of Nitrate Sensor And Glucose Sensor Based On One-dimensional Copper And Copper Oxide Material

Copper materials,due to its excellent conductive ability and electrocatalytic properties,has a broad application prospect in the field of electrochemical sensors.In this thesis,a copper nanowires self-standing electrode with both lower detection limit and wide linear range to the detection of nitrate was constructed to solve the problems which existed in nitrate sensor based on copper materials currently.At the same time,the self-standing electrode exhibits wide linear range and a good sensitivity as a glucose sensor.The main work is as following:Initially,a copper nanowires self-standing film(0.5×0.6×0.05 cm3)was prepared by filtration and drying method,then the self-standing film was roasted in Ar to obtain a self-standing electrode,next the morphology and phase of the electrode was analyzed by a scanning electron microscope and x-ray diffraction.CV,LSV,DPV were employed to measure the electrochemical performance.The results show that the active surface areas(ESAs)of the different electrode are Cu-600>Cu-700>Cu-800.The Cu-600 as nitrate sensor not only has a very low detection limit(1.34 ?M),but also the sensitivity(1.375 ?A/?M)and linear response range(8~5864 ?M)are greatly superior to the sensor reported in other literature.Subsequently,a copper nanowires self-standing film(0.4×0.5×0.05 cm3)was prepared by template and drying method,then the self-standing film was roasted at600 ? in Ar to obtain a self-standing electrode,next the potential applications of the electrode in the field of non-enzymatic glucose sensors were studied.The electrode as glucose sensor exhibits excellent performance: with a high sensitivity(0.8?A/?M),a low detection limit(0.69 ?M)and a wide linear range(2.8?M~7135 ?M).The comprehensive performance of our sensor is superior to Cu-based sensorsreported in the literature,and our sensor has a good anti-interference ability to AA?AP?Cl-.Additionally,our sensor is accurate in the detection of human serum samples.Finally,a CuO nanowire self-standing electrode was prepared by anode oxidation in alkaline medium based on copper nanowires self-standing film.Chronoamperometry was used to study the performance of the electrode as a glucose sensor.The results show that CuO nanowire self-standing electrode as a glucose sensor has a low detection limit(0.96 ?M),a high sensitivity(0.7 ?A/?M)and a wide linear range(3 ?M ~7135 ?M).The sensitivity and linear range are superior to the non-Enzyme glucose sensor based on CuO reported in the literature.Our sensor has a good anti-interference ability to AA,AP,Cl-.Our sensor is accurate in the detection of human serum samples.