Photocatalytic Coatings for Self Cleaning Glass

K.D.Sanderson, S.Hurst, T.McKittrick, D.Rimmer, L.Ye

Over recent years there has been a rapid growth in the markets for large area coated glass products. Among the driving forces for this growth have been building design, energy efficiency, conservation needs, environmental issues and associated legislation. Coatings produced by Chemical Vapour Deposition (CVD) have now been on the market for many years and cover a wide range of applications such as low emissivity coatings based on n-type semiconductors, reflective solar control coatings and protective barrier layer coatings.

The presentation details the challenges of using APCVD to deposit polycrystalline TiO2 films, on large area glass substrates for Self-Cleaning Applications. Details of the coatings structure and properties are discussed. An investigation into the photodestruction of various organic contaminants such as stearic acid is presented.

The presentation puts the properties of the film into context by detailing the use of scattering measurements and simulated dirt mixes, to show the benefit of hydrophilic and photoactive coatings, on maintaining the cleanliness of a glass substrate.

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