Design of intelligent response antifouling composite materials

摘要

Developing environmentally friendly, broad -spectrum, and long -lasting antibacterial materials remains chall enging. Our ternary BiOI@Bi 2S3/MXene composites, which exhibit both photothermal therapy (PTT) and photodynamic therapy (PDT) antibacterial properties, were synthesized through in-situ vulcanization of hollow flower-shaped BiOI on the surface of two-dimensional Ti3C2 MXene. The unique hollow flower-shaped BiOI structure with a high exposure of the (001) crystal plane amplifies light reflection and scattering, offering more active sites to improve light utilization. Under 808 nm irradiation, these composites achieved a photothermal conversion efficiency of 57.8%, boosting the PTT antibacterial effect. The heterojunction between Bi2S3 and BiOI creates a built -in electric field at the interface, promoting hole and electron transfer. Significantly, the close -contact heterogeneous interface enhances charge transfer and suppresses electron -hole recombination, thereby boosting PDT bacteriostatic performance. EPR experiments confirmed that ∙O2− and •OH radicals play major roles in photocatalytic bacteriostatic reacti ons. The combined antibacterial action of PTT and PDT led to efficiencies of 99.7% and 99.8% against P. aeruginosa and S. aureus, respectively, under 808 nm laser irradiation. This innovative strategy and thoughtful design open new avenues for heterojunction materials in PTT and PDT sterilization.