Zinc Oxide Nanostructure Design And Electrochemical Sensor Application

Electrochemical sensors play an important role in environmental detection,healthcare,food safety and other fields.The construction of new electrochemical sensors with high sensitivity,low detection limit and high stability is one of the hot topics in the frontier research fields at home and abroad.At present,electrochemical sensors still have problems such as high detection limit and low sensitivity.As a common N-type semiconductor,zinc oxide has the advantages of simple synthesis,low price and high biocompatibility,and is widely used in various sensors.This paper aims to study high-performance zinc oxide-based electrochemical sensors,and uses a variety of methods to optimize and improve the performance of the sensors,and study their sensing mechanisms.The main contents are as follows:（1）The core-shell structure ZnO@ZIF-8 nanorods were prepared by hydrothermal method,and the shell ZIF-8 had the advantages of large surface area and high porosity,which provided rich active sites and was conducive to the diffusion of H₂O₂.The test found that the ZIF-8 shell can effectively protect ZnO from corrosion when detecting H₂O₂ in the electrolyte,which greatly prolongs the stability and service life of the electrode material.（2）ZnO/ZnS/MoS₂ films were synthesized by hydrothermal method and used for L-ascorbic acid electrochemical sensors.The sensitivity of the sensitive material on L-ascorbic acid was significantly enhanced by ultraviolet light,and the sensitivity of the sensor was increased from-0.088μAμM^-1 cm^-2 to-0.168μAμM^-1 cm^-2,which was increased by nearly1 times,and the excellent performance was derived from the charge transfer between different material energy levels in ZnO/ZnS/MoS₂ films,revealing the mechanism of photoexcitation enhancement sensing process.（3）Zinc oxide nanoarrays are synthesized on flexible polyimide substrates by hydrothermal method,and different degrees of bending strain between zinc oxide nanorods are realized by bending flexible substrates,and the piezopolarization generated by the strain greatly promotes the electrochemical reaction and greatly improves its detection performance of H₂O₂.Through finite element analysis,the piezoelectric effect of zinc oxide nanorods was simulated,and the sensing mechanism between them and H₂O₂ was elaborated.