Au-TiO For Parathion Detection ₂ Electrode Modification

In recent years, with the continuous development of modern agriculturaltechnology, the use of pesticides has become an important part of agriculturalproduction；among the many pesticides，Organophosphorus pesticide has been widelyused in people, because of its low cost, high selectivity, with a wide range ofprevention and treatment efficacy. However, with a large number of long-term use,pesticides residue have major impact on human health and the environment.There are70%of the organophosphorus pesticides on the market, this pesticide is not harmful topeople, when the concentration is below a certain value, but it is easy to accumulate inthe body and lead to people neurotoxicity. Therefore, efficiently, fast and accurate forthe detection of organophosphorus pesticide residues is very important.Chemically modified electrode is a widely used analysis methods, it canmolecular design on the surface of the base electrode, To achieve high sensitivity andselectivity. In this thesis, we have designed the Au-TiO2nanoparticles modifiedelectrode, For detection of parathion. We prepared TiO2by sol-gel method; preparedAu nanoparticles by magnetron sputtering, thereby prepared Au-TiO2nanoparticlesmodified electrochemical sensors. In this paper, we analyze the sensitivity mechanismof the sensor; band structure and electron transfer of metal and semiconductorcontacts；Analysis of the Au nanoparticles prepared by magnetron sputtering；we testthin films by UV-Vis spectrophotometer, XRD, AFM technology; Got the surface format different annealing temperature. Finally, we use the modified electrode at differentconcentrations and conditions to detect parathion, We know the detection limit of thesensor is0.01ug/mL.