Synthesis, Characterization And Gas Sensing Performance Of Sol-Gel Prepared Nanocrystalline Sno2 Thin Films

Nanocrystalline SnO₂ thin films were successfully prepared using sol-gel dip coating technique. The starting precursor was used as tin chloride dihydrate (SnCl₂.2H₂O), ethanol and glycerin. As the prepared films were fired at 500^oC. These films were characterized using XRD, FE-SEM and TEM to known crystal structure, surface morphology and microstructure property. Elemental composition was studied using energy dispersive spectrophotometer (EDAX). The H₂ gas sensing performance of nanocrystalline SnO₂ thin films were investigated and presented. It was found that the nanocrystalline SnO₂ thin films gives maximum gas response (S= 360) at 75 ^oC. The sensor shows fast speed of response (TResponse = 2 s) and quick recover (Trecover = 8 s).