Nanocrystalline TiO2 films have been deposited onto glass slides by spin-coating technique using titanium chloride (TiCl3) with content variation of poly-ethylene glycol (PEG) addition as a template. Precursors were prepared from 20 mL TiCl3 solution with varied content of PEG addition (0.01 g, 0.1 g, and 1 g). Results of XRD analysis shows a transformation of crystal phase of TiO2 with respect to PEG content. The film with 0.01 g PEG has a rutile phase, whereas the films with 0.1 g and 1 g PEG have an anatase phase. The SEM photographs show a highly porous of nanocrystalline TiO2 films. Optical properties of TiO2 films depend on the content of PEG. UV-Vis absorbance spectra show that the films have an absorption band within UV region with absorption edge shorter than 360 nm corresponding to wide optical bandgap of TiO2. Optical bandgap of TiO2 films were determined by using a plot of (hv)2 vs. hv based on absorbance spectra, that give a direct bandgap of 3.4 eV for rutile and 3.6 eV for anatase.

Keywords: Porous, Nanocrystalline TiO2, PEG template, Optical bandgap.