Fig. 7From: A Facile Method for Preparation of Cu2O-TiO2 NTA Heterojunction with Visible-Photocatalytic ActivityBand gap structure of Cu2O and TiO2 before (left) and after (right) contact. When the Cu2O-TiO2 heterojunction is formed, the electron/hole pairs photogenerated on Cu2O could transfer to TiO2 NTAsBack to article page