Preparation And Application Of Gas Sensor Based On Tin Oxide Nano-Materials

In recent years,with the improvement of human cognition,people’s environmental quality requirements are also increasing,but the daily living environment of human beings is filled with various gases,and the special human body structure makes it impossible for us to live in a complete vacuum,so monitoring the concentration of polluting gases and doing a good job of correct protection have become a hot topic in people’s research.Therefore,monitoring the concentration of polluted gases and making proper protection have become a hot topic in the field of research.The progress of science and technology has also made gas sensors develop rapidly,and generations of advanced products have been continuously developed,and resistive gas sensors are widely used because of the low preparation cost and simple manufacturing methods.As a gas-sensing material,Sn O₂ has the disadvantages of high operating temperature,low response,slow recovery,and weak selectivity,and rare earth elements have special properties,so this paper further studies the doped metal oxides of rare earth elements,which comprehensively improves the gas-sensing performance of pure Sn O₂nanomaterials.The construction of homogeneous heterojunctions also improves the performance of gas-sensitive materials.Finally,I will finish the whole design of the gas sensors based on the gas sensing material prepared which show the best performance.The specific research work is as follows:（1）Based on the hydrothermal method,orthogonal experimental design was used to prepare Sn O2 nanomaterials with different appearance by the influence of different factors,and the influence of morphology structure on gas sensitivity performance was explored.（2）Through the doping of rare earth elements,explore the best experimental preparation conditions and the best doping concentration,and prepare gas sensitive materials with excellent performance to achieve high sensitivity detection of ethanol.（3）The heterojunction was constructed,and the influence of different experimental factors on the reaction process of gas-sensing materials was explored,and the composition of the heterojunction greatly improved the gas-sensitive performance of the gas sensor such as operating temperature,response characteristics and stability.（4）Based on the prepared gas sensing materials,the gas sensing system is designed and manufactured,including the concentration detection and display of ethanol gas,and the alarm design for excessive concentration.At the same time,the prepared sensors will be compared with other instruments to find their differences.