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In situ ligand passivated organic–inorganic hybrid perovskite quantum dots for photocatalytic antibacterial applications

Junyang Liu,Yanan Wang,Mengping Wang,Xinyi Dong,Xinxin Liu,Mengqi Li,Guangjiu Zhao

The photoelectric properties of perovskite quantum dots make them have great potential in photocatalytic antibacterial applications. However, commonly used long-chain ligands are not conducive to the transfer of photogenerated charge carriers in perovskite quantum dots. In this work, we used short chain ligands with higher conjugated systems (BODIPY-OH) for surface regulated synthesis of MAPbBr 3 quantum dots (BDP/QDs). We found that there is a photogenerated carrier transfer process between BODIPY-OH and MAPbBr 3 quantum dots. BODIPY-OH can effectively separate the photogenerated carriers in MAPbBr 3 quantum dots. Due to this property, BDP/QDs have great application prospects in the field of photocatalysis. Using the specific chemical trapping techniques, we show that the binding of BODIPY-OH successfully enhances the singlet oxygen generation ability of MAPbBr 3 quantum dots through the process of photogenerated carrier transfer. Based on the excellent waterproof performance of SiO 2 , we further improved the water stability of BDP/QDs using SiO 2 (SiO 2 @BDP/QDs). The photogenerated singlet oxygen generated by SiO 2 @BDP/QDs has an effective antibacterial effect on Escherichia coli. This work provides new ideas and understanding for designing halide perovskite photocatalytic antibacterial materials for efficient antibacterial effects.