Antireflection coating with both super-hydrophilicity and photocatalysis effect

摘要

An anti-reflection (AR) coating which simultaneously realizes super-hydrophilicity and photocatalysis is successfully developed to provide a clear view for emerging sensing camera lenses. Super-hydrophilic SiO2-Na2 O layer on the surface and underlying photocatalytic TiO2 layer are connected via nano-structured tunnels fabricated by reactive dry etching technique. A self-assembled Ag nano-mask is adopted instead of lithography to pattern the nano-structure on curved surface of lenses which is normally challenging in lithography processes. The size and pitch of the nano-structure are optimized by changing the deposition condition of Ag in terms of photocatalysis efficiency and light scattering. These techniques have achieved two distinct and favorable functions even on the curved surfaces of lenses while still maintaining low reflectivity.