Antireflective and Self-cleaning Properties of SiO2/TiO2 Double-Layer Films Prepared by Cost-E ective Sol-Gel Process

SiO₂/TiO₂ double-layer films with antireflective and self-cleaning properties were prepared by dip-coating glass substrate into cost-effective SiO₂ and TiO₂ sol successively and subse-quently being calcined at 500 oC. The optical and structural properties of films have been in-vestigated by UV-visible spectrophotometer and field emission scanning electron microscope, respectively. At the same time, self-cleaning property generated from superhydrophilicity and photocatalysis was obtained. The results indicated that the as-prepared SiO₂/TiO₂ double-layer films show maximum transmittance of 95% and self-cleaning property.