Visible light induced super-hydrophilicity on single crystalline TiO2nanoparticles and WO3 layered thin films

Abstract

Single crystalline nitrogen and sulfur doped anatase octahedral TiO₂nanoparticles were synthesized from titanate nanotubes. The surfaces of these octahedral nanoparticles were oriented to the (101) face. These particles were highly dispersed in water, and thin films were coated by spin-coating of colloidal solution. These films had a (101) orientation to the substrates. Thin films of these nanoparticles on a WO₃ layer exhibited a super-hydrophilic conversion under 0.2 mW cm⁻² visible light illumination.