The Synthesis Of Perovskite Type ZnSnO₃ With Oxygen Vacancies And H₂S Gas Sensing Properties Research

The performance of hollow cubic ZnSnO3 with high concentration of oxygen vacancies in gas sensitive sensor is excellent.The oxygen vacancies can reduce the band gap of the semiconductor,make the material absorb more oxygen on the surface,make the electron transfer efficiency higher,and improve the response of the sensor.As the specific surface area increases,the active sites of the reaction are increased and the material utilization rate is improved,which will also contribute to the improvement of the sensitivity of the gas sensor.The main content of this article is as follows:1.Nanocube ZnSnO3,nanometer flower ZnSnO3 and nanosheet ZnSnO3 were prepared by different methods.X-ray electron diffraction（XRD）,scanning electron microscopy（SEM）and photoluminescence（PL）were characterized.The gas sensitivity test results show that the cubic ZnSnO₃ sensor is sensitive to H₂S,and the possible gas sensitivity principle is given.2.The performance of ZnSnO3 sensor was improved under acidic environment,and XRD,SEM,transmission electron microscope（TEM）,PL characterization and gas-sensitive performance tests were carried out.The results showed that the morphology of cubic ZnSnO3 changed and the concentration of oxygen vacancies increased under acidic environment.The sensor performance is also improved,and a method to improve the performance of ZnSnO₃ sensor is proposed.3.The performance of ZnSnO₃ sensor was improved in alkaline environment.characterized by XRD,SEM,TEM and element mapping.The crystallinity of ZnSnO3material treated under alkaline environment became worse,the morphology changed into hollow cube,and the material utilization rate increased.Moreover,X-ray photoelectron spectroscopy（XPS）and PL characterization showed that the oxygen vacancies concentration of the treated materials increased significantly.Gas sensitivity test results show that the alkaline environment has a significant effect on the performance improvement of ZnSnO₃ sensor.This work proposes a method to improve the performance of ZnSnO₃ sensor and confirms the potential of materials with high concentration of oxygen vacancies and high material utilization in the field of gas sensors.