Study On Preparation Of Tin Oxide Nanometer Powders By Ultrasonic Microwave Spray Pyrolysis

SnO2is a kind of semiconductor materials, with higher electrochemical properties, optical properties and chemical stability. It is widely used in high temperature areas such as electronics and transparent conductive electrode.In This paper, the current methods of preparing nano SnO2were reviewed. Compared with other methods, there are many advantages in the application of spray pyro lysis in the preparation of nano powder. For example preciser control of the preparation of final powder, the preparation of different form and performance of the nano powder; simpler operation process, higher purity, less equipment requirements. The microwave heating has the advantages of even heating, high efficiency, short calcination time. In this research, microwave heating was applied in the Spray pyrolysis.Characteristics of microwave heating of precursor solution droplets has a great effect on the composition and morphology of tin oxide prepared by microwave spray pyrolysis. Heating characteristic of droplets produced by ultrasonic from different precursor solution was researched in detail. In the research, Without SiC, at carrier flow rate of11/min, the droplets made from SnCl4precursor solution could be the highest temperature400℃in20th min. Without SiC, at carrier flow rate of0.51/min, the droplets made from SnCl4precursor solution could be the highest temperature420℃in20th min. With SiC, the droplets could be the highest temperature700℃or720℃in20th min in microwave furnace.SnO2powders were obtained via microwave spray pyrolysis. The effects of experimental parameters on the morphology and structure were studied. XRD, SEM and TEM were employed.The results show that the substrate temperature, furnace temperature, gas flow and solution concentration play a critical role in the morphology and structure of SnO2powder. Spherical SnO2powders could be obtained by microwave spray pyrolysis. Under the following experimental condition concentration0.04mol/L, furnace temperature650℃,craarier gas flow rate0.5L/min.uniform size clean surface SnO2powder could be achieved.The average crystallite size of powders was calculated using Scherer’s formula. Effects of main reaction effectors on the microwave spray pyrolysis process was investigated using Response Surface Method (RSM). A quadratic equation model for field was built.