Influence of electronic structure on visible light photocatalytic activity of nitrogen-doped TiO₂

Abstract

N-doped TiO₂ was synthesized by sol–gel method from precursor solutions with or without urea and post calcination in NH₃ gas. Localized states associated with N were successfully found at 0.24 eV to 0.34 eV above valence band maximum in the band gap.