Research On Preparation And Properties Of Samarium Oxide Thin Films

Sm₂O₃ is a typical lanthanide metal oxide with excellent performance due to its special outer electron structure.Most rare-earth elements have an empty 5d track,so the chemical activity of rare earth elements is very strong,and the outer space electron orbital can be used as an electron transfer station to improve photocatalytic performance.Rare earth elements have many applications in optics,electricity and magnetism,and can be used to prepare photocatalysts,phosphors,luminescent devices and so on.However,when the powder is used photocatalyst,there are some problem such as easily cohesion,loss of activity,blocked of light penetration,difficult separation and recovery and not suitable for continuous fluid system defect limits,which restrict the application of photocatalyst in the process of degradation in water.These limits can be resolved by prepration of photocatalytic thin film.This paper mainly adopts the sol-gel method research department of samarium oxide film.The as-prepared samples were characterized by X-ray diffraction?XRD?,Atomic Force Microscope?AFM?,scanning electron microscopy?SEM?,light chemical reaction apparatus and other techniques.?1?The Sm₂O₃ films were prepared by sol-gel method using ethylene glycol methyl ether?CH₃OCH₂CH₂OH?,acetic anhydride?CH₃OCOCOCH₃?and strontium nitrate?Sm?NO₃?₃·6H₂O?as raw materials.The influence of different concentration,drying temperature,crystallization temperature and holding time of Sm₂O₃ thin films were investigated in the sol-gel system.It was found that the photocatalytic performance of Sm₂O₃ thin films prepared at a concentration of0.8 mol/L,drying temperature of 200°C,crystallization temperature of 600°C and a holding time of 8 h was the best.The film prepared by this process has no impurity phase and the surface is smooth,and the degradation rate of rhodamine B can reach 75%.?2?Ag/Sm₂O₃ films were prepared by sol-gel method using ethylene glycol methyl ether,acetic anhydride,strontium nitrate and silver nitrate?AgNO₃?as raw materials.The different silver amount of doping,crystallization temperature and holding time were studied.The results showed that when the silver doping content was 3%,the crystallization temperature was 600°C,and the holding time was 8 h,the photocatalysis of the Ag/Sm₂O₃ composite film was best,photocatalysis activity can reach 96.8%.Compared with Sm₂O₃ film,the performance of Ag/Sm₂O₃ composite film was improved by 21.8%.?3?ZnO/Sm₂O₃ composites were successfully synthesized by Sol-gel method with Sm?NO3?3·6H2O,Zn?NO3?2·6H2O,ethylene glycol methyl ether and acetic anhydride as raw materials.The results show that Zn O/Sm₂O₃ composites at 600°C for 8 h with zinc doping content 3%exhibited good photocatalytic activity and high degradation efficiency of the composites for degradation of Rhodamine B?RhB?was 99.5%.,which is 24.5%higher than that of the pure phase Sm₂O₃ film,and the corresponding intensity of the photocurrent of the Zn O/Sm₂O₃ composite film is about 1.5 times that of the Sm₂O₃ film.Zn O/Sm₂O₃ film has higher electron migration and separation efficiency.