Effect of different flow rate on SnO2 thin films using electrospraying method / Nor Arifah Azyyati Azhar

In this work, SnO2 thin films were prepared by electrospraying method and the effect of different flow rate on the physical, electrical and optical properties of the films was studied. SnO2 solution was prepared by dissolving the (SnCh.2H2O) in a 50ml of absolute ethyl alcohol at concentration
l .0M. The solution was deposited on glass substrate at different flow rate; (0.1, 0.2, 0.3, 0.4, 0.5, and 0.6) ml/h. It was annealed at 500 C. Flow rate is one of the parameter that will affect SnO2 properties. High flow rate will affect surface morphology. In order to obtain particles of nm dimension through electrospray, very low flow rates of the liquid sample are needed. The effects of flow rate parameters on SnO2 surface morphology were examined using field emission scanning electron microscopy (FESEM) while the optical properties were analysed by UV-Vis spectroscopy. It was noted that the average diameter of these nanoparticles increase from (51-171) nm with increasing the flow rate from (0.1-0.4) ml/h respectively. The optical transmittance showed that nanoparticles have a high transmittance in the visible region with decreasing the flow rate. The I-V characteristic of SnO2 shows that increasing the flow rates can improve the electrical properties.