Preparation And Gas Sensitive Properties Of SnO₂ By Using Bagasse As Template

In recent years,the biological template method has been developed rapidly.We combined the special effect of nano-materials with wide application of sem-iconductor metal oxides in gas sensing field aim at the waste and serious air pollution because of the high yield and low utilization of bagasse.This paper puts the idea of preparing tin dioxide gas-sensitive materials with bagasse astemplate,and the method used in this experiment is mainly impregnation and roasting method.This not only solves the problem of waste and pollution cau sed by improper utilization of bagasse,but also makes full use of the porous s tructure of bagasse,and makes full use of the advantages of large specific surf ace area,which is advantageous to the performance improvement of gas sensiti ve materials.In consideration of the poor performance of the material with a s ingle component,the paper also uses hydrothermal method to modify the mater ial by doping zinc oxide and copper oxide to change the single component of the material.and through X-ray diffraction?XRD?,scanning surface electron mi croscopy?SEM?,the composition,morphology and structure of the materials pr epared by means of transmission electron microscopy?TEM?,X-ray photoelectr on spectroscopy?XPS?and bet specific surface area test were characterized,an d the gas sensing properties of the materials were studied by static test method.The findings are as follows:?1?ZnO/SnO₂ systemThe prepared bagasse template tin dioxide completely reproduced the morphological structure of the bagasse template,the whole presents the porous form of bagasse,and the material of tin oxide is smooth,there is no irregular agglomeration phenomenon,and its structure presents the square rutile structure.After doping zinc oxide,the surface of the composite material becomes coarse because of the adhesion of zinc oxide particles,the zinc oxide particles are uniformly distributed on the surface of tin dioxide,the particle size is basically uniform,the zinc oxide is the structure of Zn ore,the crystallinity of the material is high,and there is no other impurities.The results of the research on the gas-sensing properties of the materials show that the gas-sensing properties of pure tin dioxide materials with very low sensitivity are greatly improved by doping.With the increase of zinc oxide doping,the gas sensitivity of the material to methanol is getting better and better,and the doping ratio is 1:1.The best working temperature of the material is 340?.The study of gas-sensing performance of different atmosphere target gas shows that the material selection is good.But the material's stability is poor.?1?CuO/SnO₂ systemBagasse template tin dioxide completely reproduced the morphological structure of the bagasse template,the tin dioxide molecule replaces the organic matter position in bagasse,the whole presents the porous form of bagasse,and the material of tin oxide is smooth,there is no irregular agglomeration phenomenon,and its structure presents the square rutile structure.In the process of preparing copper oxide by hydrothermal method,because of the addition of surfactants,the doped copper oxide makes the surface of the composite material not smooth,there are many folds,the prepared copper oxide is a single oblique crystal,the composite has the formation of P-n junction.The results of gas sensitivity test show that the gas-sensitive properties of the materials are improved by doping.With the increase of copper oxide doping,the gas sensitivity of the material to ethanol is getting better and the doping quantity is 20?mass fraction?.The best working temperature of the material is 300?.Good selection of materials and poor stability.