Straddle-type heterostructure films endow titanium implant with NIR photocatalysis property for rapid sterilization

Near-infrared (NIR) light-triggered photocatalysis antibacterial therapy has attracted significant attention. Herein, we designed a straddle-type heterostructure film of ZnS/Ag 2 S nanorod on the titanium implant, which showed excellent NIR photocatalytic ability. Under NIR, the electrons of Ag 2 S cascaded jump to ZnS conduction band (CB), and the electron of ZnS was half-jumped to Ag 2 S valence band (VB). The VB of Ag 2 S acted as a consumption platform for the holes of Ag 2 S and the electrons of ZnS, improving photocatalytic efficiency. To prove the feasibility of this mechanism, another straddle-type heterostructure of ZnS/Bi 2 S 3 with similar energy band structure was fabricated, and its NIR photocatalytic ability was also distinctly enhanced. Furthermore, the ZnS/Ag 2 S heterostructure films rapidly removed bacteria in vitro and in vivo under the NIR irradiation. This work innovatively discovered NIR photocatalytic effect of the straddle-type heterostructure, which complemented the design of heterostructures in photocatalysis.