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Electrical property and surface morphology of nanostructured TiO2 film prepared at different number of coatings

Sol-gel method is used to deposit each of the Titanium Dioxide (TiO2) film coating layers to indicate the porosity and to see the thickness by each coating layers. The electrical properties were studied on the thickness variance. The surface morphologies of the prepared TiO2 film were observed by using Field Emission Scanning Electron Microscopy (FESEM) to investigate the evolution of TiO2 grains and surface morphology. The electrical properties were investigated by using current-voltage (I-V) measurement to study the electrical resistivity behavior hence the conductivity of the film. From this study, it is known that the coating layer affects the porosity and the thickness of TiO2 film. Porosity of film was found to increase but the I-V was decreasing as the coating layer increased.