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This study investigated the effect of aging TiO 2 Sol on the final thin film performance using the heat-assisted sol-gel synthesis method. The sol was aged 24 h, 48 h, and 72 h respectively before being spin-coated on glass substrates. The annealing of the coated thin films occurred at 600 C. The scanning electron microscope, x-ray diffraction (XRD), and UV–vis spectrophotometer characterized the thin films to ascertain morphological, structural, and optical properties. Also, methylene blue degradation characterized the thin films to confirm the self-cleaning properties. The result revealed that aging time influences the ability of the electrons to gather or transit. The light absorption experienced an increasing shift in value. Also, light absorption optimized with absorption bands with peak intensities becoming strong as aging time increased. Aging the TiO 2 Sol caused micro and macro-structural transformations. The …