The Preparation Of Nanometer Materials Modified Electrodes And Their Detection Of Lead Ion And Hydrogen Peroxide

Electrodeposition preparation of different silver nanoparticles modified electrodes on the ITO substrate By chronoamperometry (CA) in different conditions, Using SEM, XRD, EDS characterizations to analyses the surface morphology and structure of the silver modified electrodes; then the optimal electrode’s detection performance of lead ion and the effect of the optimal accumulation time on the test results were studied by differential pulse stripping voltammetry (DPV). The results showed that preparing of nanometer silver modified electrodes with electrodeposition time300s is best,the optimal accumulation time is80s, the modified electrodes for the detection limit of Pb2+is0.1umol/L, two orders of magnitude lower than the national minimum requirements.Electrodeposition of different gold nanoparticles modified electrodes by cyclic voltammetry(CV) on the ITO substrate in different conditions, the surface morphology and structure gold nanoparticles modified electrodes were analyzed by SEM, XRD, EDS characterizations; then the optimal electrode’s detection performance of lead ion and the effect of the optimal accumulation time on the test results were investigated by differential pulse stripping voltammetry (DPV). Results indicated that Using cyclic voltammetry (CV) to prepare nanometer gold modified electrodes with scan10circle is best, the optimal accumulation time is80s, the modified electrodes for the detection limit of Pb2+is3umol/L.Fe3O4nanoparticles wre prepared by co-precipitation method,and then they wre applied to modified electrode preparation. The surface morphology and structure of the nanoparticles were charactrrized by SEM、XRD、TEM、HRTEM. The detection performance of H2O2was studied by cyclic voltammetry(CV), current response to the time and anti-interference ability of the influence of ions on the modified electrode were study by Chronoamperometry. It turned out that blending10%cobalt Fe3O4has the best detection performance of H2O2,with the limitation of1mM. The modified electrode showed good anti-interference ability of the influence of ions.The preparation of CO3O4nanoparticles modified electrodes was electrodeposited directly on the ITO substrate by CV and CA. The surface morphology and structure of the nanoparticles were charactrrized by SEM、EDS、XPS. The detection effection of H2O2was studied by cyclic voltammetry(CV), current response to the time and anti-interference ability of the influence of ions on the modified electrode were study by Chronoamperometry. The results showed that the modified electrode had a low limitation towards H2O2with3mM and it owned a excellent anti-interference ability.CO3O4nanoparticles were prepared by the means of Hydrothermal Synthesis using Co(NO3)2as Co source. The surface morphology and structure of the nanoparticles were charactrrized by SEM、TEM、EDS、HRTEM、XRD. The detection effection of H2O2was studied by cyclic voltammetry(CV), current response to the time and anti-interference ability of the influence were study by Chronoamperometry. The results showed that the modified electrode had a low limitation towards H2O2with1mM and it showed a excellent anti-interference ability.The preparation of nanometer Fe2O3is by coprecipitation method and high temperature burning.And then they were used for the preparation of Fe2O3modified electrodes.The surface morphology andstructure of the nanoparticles were charactrrized by SEM、TEM、EDS、HRTEM、XRD. The detection effection of H2O2was studied by cyclic voltammetry(CV), current response to the time and anti-interference ability of the influence were study by Chronoamperometry. The Results indicated that the one which was synthesized at400℃was blending Fe3O4and it had a low limitation towards H2O2with1mM and it showed a excellent anti-interference ability.