Over the last few years there has been a growing interest in the field of semiconductor photochemistry regarding the development of self-cleaning coatings [1–5]. In particular, increased attention has been focused in the use of photocatalytic titania (TiO2) thin films, mainly due their self-cleaning nature. Understanding the fundamental process and enhancing the photocatalytic efficiency of titania photocatalysis has become a major research focus in our team, bearing in mind industrial applications, such as transparent and colourless coatings that possess anti-fogging, self-cleaning or antibacterial activities for general purpose glass windows. Nanocrystalline films of titania are capable of acting as photoactive coatings, because of their intrinsic ability to degrade pollutants dissolved in water [6]. The thin film of titania acts as a photocatalyst for the dissociation and mineralization of organic impurities on a particular surface, such as glass. The driving force behind this photocatalisation is simply ultraviolet (UV) light and atmospheric oxygen.