Of Sno <sub> 2 </ Sub> Nanomaterials And Performance Characterization

SnO₂ has the widespread use in the industry, is the important electron, the ceramics and the chemical material. Nanometer SnO₂ powders were prepared by homogeneous precipitation method in this paper, with SnCl₄·5H₂O being the raw materials and urea being the precipitant. Thermal analysis, XRD,TEM, IR and digital bridge were used to characterize the changes of the SnO₂ precursor when being heated, the SnO₂ particle phase,shape,size distribution,optical and electrical property. The influences of nine factors, including reactants ratio, composition, initial pH value,anti-aggregative agent ,reaction time and temperature,the dripping method,way of dehydration and sintering temperature , on the particle size, shape and property were investigated systematically, and finally a optimization process was obtained.Uses this method may prepare particle size is smaller than the 13nm SnO₂ nano-sized powder, moreover the powder average grain diameter is small, the disperser is even, the specific surface area is bigger, reunites few. In the experimental process, the reactant ratio as well as the agglutinates temperature is bigger influence to particle size.May know through the TEM analysis, when the reactant ratio is 1:5 or 1:7, makes the powder although the particle size is small, but the dispersivity is not good, has the reunion phenomenon occurrence. But the reactant ratio is 1:6, the granule disperser is even, also the particle size is smaller, distributes narrowly, equally is 13.2nm.Thus the reactant ratio is 1:6.May know through the XRD analysis, when the reactant ratio is 1:6, in 600℃agglutinates 2h, makes the sample diffraction peak position and the intensity is nearly completely consistent with the SnO₂ characteristic peak standard value. The results showed: nano-sized SnO₂, does not have the impurity existence, agglutinates completely. Thus best agglutinates temperature is 600℃.The study showed that this process, which can produce fine SnO₂ particles, was not only easy to master, but also had a prospect for industrialization.