Synthesis,Characterization And Gas Sensitive Properties Of Rare Earth-doped In₂O₃ Nanowires Arrays

In the 21st century,the country has developed rapidly,and the problem of environmental pollution has become more and more serious.In order to detect and monitor toxic and harmful gases,it is urgent to develop high-performance gas sensors.Among them,oxide semiconductor gas sensors have entered the field of view of scholars due to their portability and long life,while In₂O₃ materials have attracted extensive attention due to their wide band gap,high electrical conductivity and better gas sensing performance.At present,there are few studies on the physical mechanism of the effect of doping amount on the gas sensing performance of In₂O₃.Therefore,this thesis aims to explore the mechanism of the effect of doping amount on the gas sensing performance,and establish the relationship between the doping amount,structure and gas sensing performance.The main contents of this article are as follows:（1）Using the hard template method with SBA-15 as template,the effect of sintering temperature on the microscopic morphology and grain size of In₂O₃ nanowire arrays was explored.The diameter of the nanowires is about 10 nm and the spacing is about 3 nm.The structure at this time not only ensures the consistent microscopic morphology and grain size of the material,but also has good gas transport channels and electron transport channels.Provide a good foundation.（2）A series of rare earth elements La,Tb,Er doped In₂O₃ nanowire arrays were synthesized by the hard template method,and the effect of rare earth element doping on the structure and gas sensing properties of the In₂O₃ samples was investigated.The results show that:in this doping concentration The microscopic morphology and grain size of the samples are consistent,and the average binding energy between the atoms of the samples shows a trend of first increasing and then decreasing.Compared with In₂O₃,the gas-sensing performance of the impurity sample is improved by 2 times,the doping of 5%Tb is improved by 2.3 times,and the doping of 5%Er is improved by 1.7times.Through comparative research,it is found that the doping amount of rare earth elements is appropriately increased on the surface,which can improve the average binding energy and electron transport capacity of the sample,which is beneficial to improve the gas sensing performance of the material.