Straddle-Type Heterostructure Films Endow Titanium Implant with Nir Photocatalysis Property for Rapid Sterilization

Abstract

Near-infrared (NIR) light-triggered photocatalysis antibacterial therapy has attracted significant attention. Herein, we designed a straddle-type heterostructure film of ZnS/Ag2S nanorod on the titanium implant, which showed excellent NIR photocatalytic ability. The mechanism of photocatalytic was related to that the electrons of Ag2S cascaded jump to ZnS conduction band (CB), and the electron of ZnS was half-jumped to Ag2S valence band (VB). The VB of Ag2S acted as a complexation platform for electron-hole, allowing the consumption of the holes of Ag2S and the electrons of ZnS, prolonging the carrier life. To prove the feasibility of this mechanism, another straddle-type heterostructure of ZnS/Bi2S3 was fabricated, and its NIR photocatalytic ability was also distinctly enhanced. Furthermore, the ZnS/Ag2S heterostructure films rapidly removed bacteria in vitro and in vivo under the NIR irradiation. This work innovatively discovered the effect of straddle-type heterostructures on NIR photocatalysis, which complemented the design of heterostructures in photocatalysis.

Keywords: NIR photocatalysis, Straddle-type heterostructure, Core-shell structure, Antibacteria