EFFECT OF DEGUSSA P25 CONTENT ON THE DEPOSITION OF TiO2 COATING ON CERAMIC SUBSTRATE

TiO 2 coatings were deposited on unglazed ceramic tiles to study the property of its antimicrobial activity. Here, the effect of TiO 2 nanoparticles content (Degussa P25) on the TiO 2 coatings’ characteristics was investigated. TiO 2 sol containing 25, 50, and 100 g/L Degussa P25 were deposited few times on ceramic tiles via sol-gel dip coating method and heat treated at 500°C. The coatings were analyzed using SEM and the phases were characterized using GAXRD. The results show that Degussa P25 content significantly influences the TiO 2 coatings morphology and thickness. Increasing the Degussa P25 content led to a thicker and denser coating with different Degussa P25 content yielded different thickness at specific dipping time. 50 g/L of Degussa P25 was discovered as the maximum amount to be used for achieving good adherence coating on the ceramic tiles. Five dipping of TiO 2 sol containing 50 g/L Degussa P25 was found appropriate to generate coating of continuous layer with average thickness of ~29 µm. The Degussa P25 content, however, shows insignificant effect on coating crystallinity.