**4. Conclusions**

The investigation relates the preparation of antibiofilm composite coatings containing both photocatalytic non-leaching Ag-doped TiO2 and leaching silver biocide for production of potent oxidants (ROS) and silver species at the surface. The antimicrobial activity of these composite surfaces was quantified based on the inhibition of biofilm formation using crystal violet assay, which can be adopted more conveniently in high-throughput experiments. These antimicrobial materials are capable of killing microorganisms upon contact by inhibiting the biofilm formation in the aqueous environments. Both epoxy/TiO2 and epoxy/Ag-TiO2 nanocomposites exposed to UV irradiation exhibited antibiofilm activity against *S. aureus* (Gram-positive) and *E. coli* (Gram-negative). Although the optimal antimicrobial conditions remain to be fully established, the results highlight a better antibiofilm activity of Epoxy/Ag-TiO2 compared to Epoxy/TiO2. The role of different silver species could be that Ag+ as an active species found to enhance the catalytic activity, in contrast, Ag0 species showing strong antibacterial activity. This material may find potential applications in designing self-disinfecting surfaces, especially for hospitals and food industries where hygiene is a high priority.
