W/Y Doped SnO₂ Powders Prepared By Ultrasonic Atomization Pyrolysis And Their Optical Properties

Among modern buildings,most of the buildings in China belong to high-energy consumption buildings,in which the glass loses the most heat,and reflective transparent oxide powder appears to reduce the heat loss of the glass.Tin dioxide is widely used in heat-insulating and transparent materials.It has the advantages of low cost,chemical stability,corrosion resistance and wear resistance.The doped tin dioxide has high visible light and near infrared light shielding performance.At present,there are problems such as high production cost and great environmental pollution for the traditional powder preparation technology,but the ultrasonic atomization pyrolysis method effectively solves these problems.The ultrasonic atomization pyrolysis method has the advantages of simple equipment,small prepared particles,uniform particle size distribution,and continuous production.It has become one of the most promising technologies in powder preparation technology.In view of this,this paper uses ultrasonic atomization pyrolysis method to synthesize submicron powder,and study the influence of different pyrolysis temperature,precursor solution concentration and doping amount on the characteristics of the powder during the ultrasonic atomization pyrolysis process.The powders were characterized by thermogravimetry,X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscope(TEM),scanning electron microscope(SEM),UV-Vis-NIR spectrophotometer,etc.,Analysis of powder structure,composition,morphology,optical properties,etc.The main contents are as follows:1.Tin tetrachloride(SnCl4·5H2O)and ammonium metatungstate((NH4)6H2W12O40·XH2O)were used as raw materials.W-SnO2(WTO)powder was prepared by ultrasonic atomization pyrolysis method to obtain n-type semiconductors.The effects of different pyrolysis temperatures,precursor solution concentration,and tungsten doping amount on the morphology,structure,and optical properties of WTO powders were studied.The prepared WTO powder was off-white,and the size of the powder was all submicron spherical particles,with uniform particle size distribution and less agglomeration.The crystal form of the WTO submicron powder is a tetragonal rutile structure,and the(110)crystal plane is selected for preferential growth.The best conditions for WTO submicron powders are:pyrolysis temperature is 700?,precursor solution concentration is 0.05mol/L,and tungsten doping amount is 8wt%.The average transmittance of visible light is 61.04%,the near-infrared transmittance is low,and the near-infrared transmittance at a wavelength of 2000 nm-2500 nm is less than 10%.WTO sub-micron n-type semiconductor powder has good near-infrared shielding performance2.Tin tetrachloride(SnCl4·5H2O)and yttrium nitrate(YN3O9·6H2O)were used as raw materials.Y-SnO2(YTO)powder was prepared by ultrasonic atomization pyrolysis method to obtain p-type semiconductor.The effects of different pyrolysis temperatures,precursor solution concentration,and tungsten doping amount on the morphology,structure,and optical properties of WTO powders were studied.YTO powder is light yellow and is submicron spherical particles with uniform particle size distribution and less agglomeration.The crystal form of YTO submicron powder is tetragonal rutile structure,and the(110)crystal plane is selected to grow preferentially.The grain size of YTO submicron powder is larger than that of pure tin dioxide.The best conditions for obtaining YTO submicron powder through experimental research are:pyrolysis temperature is 600?,precursor solution concentration is 0.05 mol/L,and tungsten doping amount is 6wt%.Under the optimal conditions,the average transmittance of visible light of YTO powder is 73.14%,the highest transmittance can reach more than 80%,and the lowest near-infrared transmittance can reach less than 30%.WTO submicron p-type semiconductor powders show excellent optical properties.