It is known that holes and electrons,generated through UV illumination,have to be separated and have to reach the surface in order to allow the electrochemical reaction with pollutants and water to proceed.Photocatalytic activity strongly depends on the
synthesis method of the material.Atomic layer deposition(ALD)is a technique that allows a very precise film thickness control,which is uniform even on nanos-tructured substrates. Moreover,it allows to grow films at re-latively low temperatures. Changing growth temperature also enables the deposition of films with different structure and surface
roughness.