Synthesis Of Zinc Oxide And Tin Oxide Gas Sensing Materials And Their Properties

With further deepen of industrialization,environmental pollution has attracted more and more attention.Volatile and toxic gases have cause concern for safety in the workplace,daily life and health in the environment.Sensors to detect these gases have attracted much attention for enhancing environmental protection and safety.Particular focus has been directed on semiconductor metal oxides as gas-sensing materials due to their advantageous features have attracted great attention for a long time.The oxidative or reductive interaction between the charged-surface target gases causes a change in the electrical resistance in proportion to the gas concentration.In this study,we employ a new,facile,economic and environmentally benign hydrothermal process and calcine way to prepare highly crystalline structures.The gas-sensing ability of the products showed good ethanol-sensing performance,including high sensitivity,rapid response-recovery,and good selectivity.Our study also focuses on the effect of structures on the enhancement of the selectivity to ethanol.The main contents are as follows:Hollow spheres of SnO₂?Tin oxide?,of average diameter from 300 to 900 nm,is successfully synthesized by using a one-step calcined method.This fast,simple,and reproducible method uses only one reagent?stannous octoate?and without the addition of catalyst or surfactant,synthetizes SnO₂ crystals.A plausible formation mechanism was described as a self-assembly of nanoparticles,Ostwald ripening,and crystal growth process.Our method is exhibits characteristics of quick,easy,effective,and economical.Reaction time and reaction temperature played a crucial role in the formation of the SnO₂ hollow spheres.Furthermore,the gas sensing properties of the SnO₂ hollow spheres architectures show a prominent response at low concentration,a fast response and quick recovery,good well repeatability and high sensitivity to ethanol gas.The results demonstrate that our sensor is a potential candidate for high-performance gas sensors.We have synthesized well-defined flower-like ZnO architectures self-assembled by nanosheets by a simple hydrothermal approach which rendered an easy,economical and effective method.Alkali source affected the formation of the ZnO architectures.Our method is exhibits characteristics of quick,easy,effective,and economical.Furthermore,the gas sensing properties of the flower-like ZnO architectures show a prominent response at low concentration,good well repeatability and high sensitivity to ethanol gas.The results demonstrate that our sensor is a potential candidate for high-performance gas sensors.We have synthesized well-defined ZnO hexagonal units architectures by a simple hydrothermal approach which rendered an easy,economical and effective method.Ethanol affected the formation of the ZnO architectures.The results of investigating the gas sensing properties of ZnO indicated a high sensitivity,good stability and reproducibility,and prominent selectivity.These properties demonstrated that the prepared ZnO architecture is an ideal candidate for fabricating highly sensitive gas sensors.