Preparation And Performance Study Of ATO And TiO₂ Based Nanoparticles By Wet Chemical Methods

Research and breakthroughs in wide band gap semiconductor materials have brought new technological revolutions and the development of emerging industries.It can be used in photocatalysts,optical glass,photovoltaic equipment,solar cells and so on.ATO and TiO₂based wide band gap semiconductor materials are new wide band gap semiconductor materials.Due to abundant sources,low cost,environmental friendliness and its own excellent optoelectronic characteristics,it has potential application prospects in various fields.The wet chemical method has the advantages of simple process,low cost and short production cycle.It can prepare different materials,especially wide band gap semiconductor materials.In this paper,improved wet chemical methods were used to prepare these two nanoparticles.Through TG-DSC,XRD,UV-Vis,FT-IR,Hall,TEM,SEM,SAED and EDS,the effects of synthesis conditions on precursor thermal effect,powder crystal structure,photoelectric properties,surface functional groups,chemical bonds,crystalline size,morphology,and composition were discussed.New preparation methods with mild reaction conditions,short preparation process and meeting the requirements of green industrial production were sought.The details are summarized as follows:(1)10%(%represents the atom ratio)Sb doped SnO₂ nanoparticles were prepared by precipitation modified coprecipitation(PMC)method and solution modified coprecipitation(SMC)method.The results showed that ATO samples at 600°C had high crystallinity and good electrical performance.The smaller the ratio of the calculated crystalline size on the(110)plane to that on the(101)plane,the better the electrical performance;ATO nanoparticles were prepared by ethanol-assisted secondary precipitation method.The results showed that compared with acidic and neutral conditions,the crystallinity of ATO samples prepared under alkaline conditions was higher.Sb was more effectively doped,which was conducive to improving electrical properties.(2)Bamboo leaf-like rutile TiO₂ nanoparticles were successfully prepared by HCl-water volatilization-assisted precipitation method at 200 ^oC.The results showed that low HCl content and longer HCl-water volatilization time could promote the conversion of anatase TiO₂ to rutile TiO₂.TiO₂ samples prepared below 200 ^oC were all anatase phase.Interestingly,the photocatalytic activity of rutile TiO₂ samples prepared at 200°C were better than that of anatase TiO₂ samples and commercial P25 products.(3)Sn doped TiO₂ nanoparticles were prepared by direct solution oxidation method.The effects of Sn doping amount,heat treatment temperature and water amount on crystal structure and photocatalytic performance were investigated.The results showed that the photocatalytic performance of undoped pure TiO₂ sample at 75 ^oC was better than Sn doped TiO₂ sample.The reason may be that low temperature was not conducive to Sn incorporation into the TiO₂ lattice.Sn was ionized on the surface of TiO₂,Sn was not completely incorporated effectively.When the molar ratio of tetrabutyl titanate,H2O and acetic acid was1:150:5,Sn-doped TiO₂ sample had the highest degradation rate for methyl orange and the best photocatalytic performance.(4)Sn-Fe co-doped and Cu single-doped TiO₂ nanoparticles were prepared by aqueous solution-direct oxidation method,respectively.The results showed that the TiO₂ samples with different Sn-Fe doping amounts were anatase phase with good crystallinity.The 0.75%Fe-0.75%and 0%Fe-1.5%Sn doped TiO₂ samples had the highest degradation rate for methyl orange and the best photocatalytic performance.In addition,Cu doped TiO₂ samples with good crystallinity and small crystalline size can be prepared at as low as 75°C.Otherwise,the photocatalytic performance of 0.4%Cu doped TiO₂ sample at 450°C was the best.