A Series of Silver Doped Butterfly-like Ti8Ag2 Clusters with Two Ag ions Panelled in a Ti8 Surface
Silver doped TiO2 (Ag-TiO2) materials show high activity and good stability in photocatalysis, but the mechanism could not be illustrated clearly due to the imprecise and inhomogeneous characteristics. Ag-doped titanium-oxo clusters (Ag-TOCs) with exact crystal structure, which are rarely reported, are benifical for further understanding structure-property relationships. Herein, six new Ag-TOCs with butterfly-like Ti8Ag2 core have been synthesized through facile solvothermal reactions, in which two Ag ions are successfully linked to the surface of Ti8 core. To be interest, the Ti6 unit from the Ti8Ag2 core is similar to that found in the anatase structure and may be as promising models for Ag-TiO2 materials. The band gaps of these Ag-TOCs show diﬀerent values mainly affected by different ligands. The DFT calculation revealed the lowest energy bands of Ag-TOCs are attributed to the Ag-to-TiO core charge transfer bands. Additionaly, all Ag-TOCs exhibit good photoelectric response and high photodegradation activity of organic dyes.