Facile Synthesis of Cu Quantum Dots‐TiO 2 Nanosheets Schottky Junction and Improved Photocatalytic Degradation Activity

Cu quantum dots (CuQDs), which are about 2–4‐nm large, are successfully loaded on the surface of TiO 2 nanosheet by a mild and simple method. Under UV light irradiation (λ≤400 nm), CuQDs (10 wt %)‐TiO 2 shows a photocatalytic activity 1.9 times higher than TiO 2 for the degradation of RhB, although with a lower surface area than TiO 2 . The trapping experiment shows that the main oxidation species is . O 2− , which due to the obvious electron migration from TiO 2 to CuQDs. The CuQDs loading efficiently improves the photocatalytic activity of CuQDs‐TiO 2 , which is mainly ascribed to the enhanced charge transfer and separation efficiency by the formation of Schottky junction between CuQDs and TiO 2 .