Investigation on dipping cycles titanium dioxide (Ti02) thin film by dip coating technique for optical sensor application / Alif Aizad Mohd Hisham

Porous titanium dioxide, (Ti02) thin films was deposited onto glass slides by the solgel dip coating method. The optical characteristics, thickness and surface of dipcoated thin films were characterized using UV-VIS NIR spectrometer, field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and surface profiler. From this work, it is known that the more cycle of dipping, the more thickness of the thin films and increased the porosity of thin films been achieved. The resultant of TiC^fhin films were investigated from 5, 10, 15, 20 and 25 dipping cycles. At 25 dipping cycles, AFM result revealed that the Ti02 thin film has a good surface roughness and increased along with the thickness. FESEM shows that with 50K magnification, 25 dipping cycles shows the highest porosity value calculated which was 174nm. Optical properties result indicated the highest absorbance percentages value occurred at 25 dipping cycles indicated average of O.lOa.u and transmittance percentages value was vice versa. Furthermore, 25 dipping cycles too, indicated 3.10eV of optical energy band gap and all these results achieved after the thin films annealed at 450 °C.